TIDMCCZ
RNS Number : 2990A
Castillo Copper Limited
01 June 2021
01 June 2021
CASTILLO COPPER LIMITED
("Castillo" or the "Company")
Expanded drilling campaign set to commence at Big One
Deposit
Castillo Copper Limited (LSE and ASX: CCZ), a base metal
explorer primarily focused on copper across Australia and Zambia,
is delighted to announce the geology team has finalised the
drilling campaign for the Big One Deposit which will comprise 26
drill-holes for 2,828m. This includes 108m of HQ diamond coring in
two drill-holes to collect detailed assay, density, and
geotechnical measurements. For comparison, the 2020 drilling
programme totalled 21 RC drill-holes for 1,467m.
The programme, which factors in the recent geophysics survey
that comprised six 500-700m lines across the 1,200m strike event,
is designed to extend known mineralisation and build on previous
drill results.
Highlights
-- Castillo's geology team have finalised a new 26 drill-hole
campaign for 2,828m to extend known mineralisation:
o A key focus is to build on the stellar results derived from
previous programmes which included the following best
intercepts
-- 303RC: 40m @ 1.64% from (fm) surface incl: 11m @ 4.40% fm
24m, 5m @ 7.34% fm 28m & 1m @ 16.65% fm 29m
-- 301RC: 44m @ 1.19% Cu fm surface incl: 14m @ 3.55% fm 27m, 3m
@ 10.88% fm 37m & 1m @ 12.6% fm 37m
-- BO017: 34m @ 1.51% Cu from surface incl: 21m @ 2.25% Cu fm
surface, 12m @ 3.44% Cu fm 3m, 6m @ 4.79% Cu fm 3m and 1m @ 9.4% fm
9m
-- Through reconciling legacy drilling and geochemical data
against the 2D and 3D geophysical models, the geology team have
optimised and expanded the campaign to target several newly
identified bedrock conductors:
o This includes a large, interpreted anomaly north-west of the
line of lode that suggests extensive underlying copper
mineralisation is potentially located along fault structures rather
than constrained within the trachyte dyke.
-- Logistical support for the upcoming campaign is now in place,
while the drilling crew is slated to arrive and commence work
within the next one-to-two weeks.
-- In readiness for the next phase of the campaign, which will
see drilling move on to the Arya and Sansa Prospects, the geology
team are reviewing all key data points to ensure optimal
results:
o Notably, there are several bedrock conductors across these two
prospects that are prime drill-test targets including EG01 - which
is interpreted to be 130m thick, 1,500m by 450m, and circa 430m
deep.
-- In line with the Castillo's strategic intent to evolve into a
mid-tier copper group, the Board remains optimistic 2021 will be a
transformative year.
Simon Paull, Managing Director of Castillo Copper, said:
"Reconciling geophysics findings with legacy drilling and
geochemical data should enable Castillo's geology team to design
effective drilling campaigns for the Big One Deposit, Arya and
Sansa Prospects with a high degree of confidence. Consequently, as
we progress through several phases of exploring the Mt Oxide
Project over the balance of 2021, the Board is optimistic value can
be created for all stakeholders."
OPTIMAL TARGETS
Big One Deposit
As a result of reconciling historical drilling and geochemical
data with the 2D / 3D geophysical models, the geology team has
optimised and expanded the drilling campaign at the Big One
Deposit. Notably, this includes a large, interpreted bedrock
conductor north-west of the line of lode - discovered along Line 3
(Figure 1 and 2) - which is part of the fault structure and not
contained within the trachyte dyke.
Note, a summary of the now completed survey and interpretation
of the 3D resistivity and chargeability model generated by the
geophysicist consultant, GeoDiscovery, is detailed in Appendices B
& C of the PDF version.
Figure 1: LINE 3 - NEWLY IDENTIFIED BEDROCK CONDUCTORS and
Figure 2: LINE LOCATIONS TRANSVERSING BIG ONE DEPOSIT (refer to PDF
version linked below)
Arya and Sansa Prospects
Once drilling is complete at the Big One Deposit, the campaign
will move across to the Arya and Sansa Prospects. In readiness for
this phase of the programme, the geology team are reviewing all key
data points to ensure the highest probability of success.
Across the Arya and Sansa Prospects are several inferred bedrock
conductors which are prime test-drill targets including EG01 which
is interpreted to be 130m thick, 1,500m by 450m, and circa 430m
deep. Further, there are surface soil and rock chip copper
anomalies to support the shallower conductors, EG02 & EG10.
Next Steps
The concurrent next steps Castillo's team is working on is as
follows:
-- Ensuring logistics are in place so the drilling crew can
deploy to site within the next 1-2 weeks so work can commence at
the Big One Deposit.
-- Finalise the design of the drilling programme for the Arya and Sansa Prospects.
In addition to this release, a PDF version of this report with
supplementary information can be found on the Company's website:
https://www.castillocopper.com/asx-announcements/
For further information, please contact:
Castillo Copper Limited +61 8 6558 0886
Simon Paull (Australia), Managing Director
Gerrard Hall (UK), Director
SI Capital Limited (Financial Adviser and
Corporate Broker) +44 (0)1483 413500
Nick Emerson
Luther Pendragon (Financial PR) +44 (0)20 7618 9100
Harry Chathli, Alexis Gore, Joe Quinlan
About Castillo Copper
Castillo Copper Limited is an Australian-based explorer
primarily focused on copper across Australia and Zambia. The group
is embarking on a strategic transformation to morph into a mid-tier
copper group underpinned by its core projects:
-- The Mt Oxide project in the Mt Isa copper-belt district,
north-west Queensland, which delivers significant exploration
upside through having several high-grade targets and a sizeable
untested anomaly within its boundaries in a copper-rich region.
-- Four high-quality prospective assets across Zambia's
copper-belt which is the second largest copper producer in
Africa.
-- A large tenure footprint proximal to Broken Hill's
world-class deposit that is prospective for
zinc-silver-lead-copper-gold.
-- Cangai Copper Mine in northern New South Wales, which is one
of Australia's highest grading historic copper mines.
The group is listed on the LSE and ASX under the ticker
"CCZ."
Competent Person Statement
The information in this report that relates to Exploration
Results for "Mt Oxide Project" is based on information compiled or
reviewed by Mr Mark Biggs. Mr Biggs is both a shareholder and
director of ROM Resources, a company which is a shareholder of
Castillo Copper Limited. ROM Resources provides ad hoc geological
consultancy services to Castillo Copper Limited. Mr Biggs is a
member of the Australian Institute of Mining and Metallurgy (member
#107188) and has sufficient experience of relevance to the styles
of mineralisation and types of deposits under consideration, and to
the activities undertaken, to qualify as a Competent Person as
defined in the 2012 Edition of the Joint Ore Reserves Committee
(JORC) Australasian Code for Reporting of Exploration Results, and
Mineral Resources. Mr Biggs holds an AusIMM Online Course
Certificate in 2012 JORC Code Reporting. Mr Biggs also consents to
the inclusion in this report of the matters based on information in
the form and context in which it appears.
APPIX A: PROSPECTS WITHIN THE MT OXIDE PROJECT. FIGURE A1: MT
OXIDE PROJECT - PROSPECT LOCATIONS (refer to PDF version linked
above)
APPIX B: APPIX B: JORC CODE, 2012 EDITION - TABLE 1
The following JORC Code (2012 Edition) Table 1 is primarily
supplied for cover results from the IP Survey at the Big One
Deposit.
Section 1 Sampling Techniques and Data
Criteria JORC Code explanation Commentary
Sampling
techniques * Nature and quality of sampling (eg cut channels, * No additional surface or drilling samples have been
random chips, or specific specialised industry collected or assayed as this release talks to the
standard measurement tools appropriate to the recently completed IP ground geophysical survey.
minerals under investigation, such as down hole gamma
sondes, or handheld XRF instruments, etc). These
examples should not be taken as limiting the broad * Any reference to rock chip samples assay results,
meaning of sampling. please refer to two CCZ ASX releases, 14(th)
September 2020 "Field Analyses verifies high-grade
copper with newly identified gold mineralisation at
* Include reference to measures taken to ensure sample Big One" and 24(th) September 2020 "Assay results
representivity and the appropriate calibration of any verify high-grade copper at Big One Deposit" for
measurement tools or systems used. sampling description.
* Aspects of the determination of mineralisation that
are Material to the Public Report.
* In cases where 'industry standard' work has been done
this would be relatively simple (eg 'reverse
circulation drilling was used to obtain 1 m samples
from which 3 kg was pulverised to produce a 30 g
charge for fire assay'). In other cases, more
explanation may be required, such as where there is
coarse gold that has inherent sampling problems.
Unusual commodities or mineralisation types (e.g.,
submarine nodules) may warrant disclosure of detailed
information.
================================================================= =========================================================================
Drilling * No new drilling has taken place.
techniques * Drill type (e.g., core, reverse circulation,
open-hole hammer, rotary air blast, auger, Bangka,
sonic, etc) and details (e.g., core diameter, triple
or standard tube, depth of diamond tails,
face-sampling bit or other type, whether core is
oriented and if so, by what method, etc).
================================================================= =========================================================================
Drill sample * No drilling nor samples were taken.
recovery * Method of recording and assessing core and chip
sample recoveries and results assessed.
* Measures taken to maximise sample recovery and ensure
representative nature of the samples.
* Whether a relationship exists between sample recovery
and grade and whether sample bias may have occurred
due to preferential loss/gain of fine/coarse
material.
================================================================= =========================================================================
Logging * No logging took place.
* Whether core and chip samples have been geologically
and geotechnically logged to a level of detail to
support appropriate Mineral Resource estimation,
mining studies and metallurgical studies.
* Whether logging is qualitative or quantitative in
nature. Core (or costean, channel, etc) photography.
* The total length and percentage of the relevant
intersections logged.
================================================================= =========================================================================
Sub-sampling * No drilling nor samples were taken.
techniques * If core, whether cut or sawn and whether quarter,
and sample half or all core taken.
preparation
* If non-core, whether riffled, tube sampled, rotary
split, etc and whether sampled wet or dry.
* For all sample types, the nature, quality, and
appropriateness of the sample preparation technique.
* Quality control procedures adopted for all
sub-sampling stages to maximise representivity of
samples.
* Measures taken to ensure that the sampling is
representative of the in-situ material collected,
including for instance results for field
duplicate/second-half sampling.
* Whether sample sizes are appropriate to the grain
size of the material being sampled.
================================================================= =========================================================================
Quality
of assay * The nature, quality and appropriateness of the * Not applicable as no new sampling or assaying took
data and assaying and laboratory procedures used and whether place.
laboratory the technique is considered partial or total.
tests
* For geophysical tools, spectrometers, handheld XRF
instruments, etc, the parameters used in determining
the analysis including instrument make and model,
reading times, calibrations factors applied and their
derivation, etc.
* Nature of quality control procedures adopted (eg
standards, blanks, duplicates, external laboratory
checks) and whether acceptable levels of accuracy
(i.e. lack of bias) and precision have been
established.
================================================================= =========================================================================
Verification
of sampling * The verification of significant intersections by * Not applicable as no new sampling or assaying took
and assaying either independent or alternative company personnel. place.
* The use of twinned holes.
* Documentation of primary data, data entry procedures,
data verification, data storage (physical and
electronic) protocols.
* Discuss any adjustment to assay data.
================================================================= =========================================================================
Location
of data * Accuracy and quality of surveys used to locate drill * The survey, as originally proposed, consisted of the
points holes (collar and down-hole surveys), trenches, mine following IP work (as per the survey plan on the next
workings and other locations used in Mineral Resource page; Figure B1) six 6 lines each 500m in length with
estimation. 50m dipoles, totalling 3km.
* Specification of the grid system used. * Fender Geophysics had noted in their quote that the
methodology may be changed to Pole-Dipole if it is
felt this will give better results. Given the line
* Quality and adequacy of topographic control. length and depth of the area of interest (150-200m)
Fender planned to extend the transmitter sites out by
4 dipoles on the southeast end of the lines to
increase depth penetration at that end.
* The spatial location for these holes has been
differentially surveyed into MGA94 - Zone 54. Collar
heights are to the Australian Height Datum.
FIGURE B1: IP SURVEY LINE LOCATION (refer to PDF
version linked above)
Table B1: Lists the planned drilling program which
includes a total of 24 reverse-circulation drillholes
and 2 HQ diamond holes for a total of 2,828m. Eleven
(11) of the RC holes will investigate the large chargeability
anomalies identified by the IP survey.
================================================================= =========================================================================
Data spacing
and * Data spacing for reporting of Exploration Results. * The scope of works for the survey is given below:
distribution
* Whether the data spacing and distribution is o Array: Dipole-Dipole (roll-along)
sufficient to establish the degree of geological and o Receiver Dipole Length: 50 m
grade continuity appropriate for the Mineral Resource o Transmitter Dipole Length: 50 m
and Ore Reserve estimation procedure(s) and o Domain and Cycle: Time domain - 2 seconds or 0.125
classifications applied. Hz
o Line Length: 500 m
o Number of Lines: 6
* Whether sample compositing has been applied. o Line kms: 3.0 km
================================================================= =========================================================================
Orientation
of data * Whether the orientation of sampling achieves unbiased * Fender Geophysics (Fender) was contracted to complete
in relation sampling of possible structures and the extent to a program of Dipole-Dipole array IP survey work for
to which this is known, considering the deposit type. Castillo Copper Limited at the Big One deposit
geological located within Castillo's Mt Oxide Project in the Mt
structure Isa copper belt (EPM 26574), approximately 170km
* If the relationship between the drilling orientation north of Mt Isa (see location map below; Figure B2).
and the orientation of key mineralised structures is Most of the interpretation comments have been
considered to have introduced a sampling bias, this provided by Ms Kate Nelson of GeoDiscovery.
should be assessed and reported if material.
FIGURE B2: SURVEY GENERAL LOCATION (refer to PDF
version linked above)
* The core objectives of the survey were to identify
massive sulphide bedrock conductors along the 1,200m
strike extent that potentially extends known
mineralisation and provide geophysical insights into
several known yet underexplored nearby anomalies
which includes previously mapped gossanous outcrops
to the north-east of the recent drilling campaign
conducted in Q4 2020.
================================================================= =========================================================================
Sample * No new samples were taken.
security * The measures taken to ensure sample security.
================================================================= =========================================================================
Audits or
reviews * The results of any audits or reviews of sampling * The data was collected by Fender Geophysics, with the
techniques and data. data reduction and modelling being conducted by
GeoDiscovery, both independent contractors to
Castillo Copper
================================================================= =========================================================================
TABLE B1: BIG ONE LOCATION OF NEW PROPOSED DRILLING
SITEID Holename E_MGA94_Z54 N_MGA94_Z55 AHD Already TDEPTH TO AZIMUTH DIP TYPE STATUS COMMENTS
DRILLED (m) DRILL
(m)
Full HQ
core;
move 5m from
RC
2021_01 301DDH 335407.5 7880328.0 160 42 54 12 325.0 -60.0 DDH 301 hole
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
Full HQ
core;
move 5m from
RC
2021_02 303DDH 335436.3 7880341.0 160 44 54 10 325.0 -60.0 DDH 303 hole
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
Deepen
existing
hole; is at
2021_03 201RC2 335414.9 7880311.0 160 50 85 35 320.0 -61.0 RC 201RC 50m
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
Deepen
existing
hole; is at
2021_04 202RC2 335428.1 7880299.0 160 82 120 38 345.0 -68.0 RC 202RC 83m
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
Deepen
existing
hole; is at
2021_05 203RC2 335432.2 7880284.0 160 107 130 23 333.0 -73.0 RC 203RC 103m
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
Deepen
existing
hole; is at
2021_06 306RC2 335393.9 7880290.5 165 107 180 73 338.7 -60.1 RC 306RC 107m
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
Deepen
existing
hole; is at
2021_07 312RC2 335285.0 7880268.0 160 83 150 67 346.0 -69.0 RC 312RC 82m
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
Changed
2021_08 315RC 335539.5 7880352.3 160 0 180 180 350.0 -60.0 RC New azimuth
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
2021_09 316RC 335482.2 7880295.7 160 0 180 180 325.0 -60.0 RC New
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
2021_10 317RC 335332.9 7880266.2 160 0 180 180 325.0 -60.0 RC New
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
2021_11 318RC 335275.0 7880253.1 160 0 160 160 325.0 -60.0 RC New
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
2021_12 319RC 335232.3 7880238.2 160 0 140 140 325.0 -60.0 RC New
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
2021_13 320RC 335184.7 7880220.5 160 0 120 120 325.0 -60.0 RC New
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
Changed
2021_14 321RC 335117.7 7880196.5 160 0 120 120 335.0 -60.0 RC New azimuth
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
2021_15 322RC 335397.1 7880268.0 160 0 120 120 325.0 -60.0 RC New
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
As suggested
by
2021_IP_01 323RC 335606.6 7880272.4 172.5 0 130 130 337.4 -60.0 RC New GeoDiscovery
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
As suggested
by
2021_IP_02 324RC 335499.9 7880530.0 202.1 0 130 130 337.5 -60.0 RC New GeoDiscovery
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
As suggested
by
2021_IP_03 325RC 335415.0 7880213.0 159.2 0 130 130 337.7 -60.0 RC New GeoDiscovery
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
As suggested
by
2021_IP_04 326RC 335379.4 7880299.8 154.8 0 130 130 337.7 -60.0 RC New GeoDiscovery
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
As suggested
by
2021_IP_05 327RC 335324.8 7880172.7 157.9 0 130 130 157.6 -60.0 RC New GeoDiscovery
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
As suggested
by
2021_IP_06 328RC 335312.0 7880203.8 155.7 0 130 130 337.6 -60.0 RC New GeoDiscovery
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
As suggested
by
2021_IP_07 329RC 335296.4 7880241.6 156.4 0 130 130 337.6 -60.0 RC New GeoDiscovery
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
As suggested
by
2021_IP_08 330RC 335159.8 7880189.3 155.6 0 130 130 337.5 -60.0 RC New GeoDiscovery
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
As suggested
by
2021_IP_09 331RC 335115.5 7880295.7 150.9 0 130 130 157.4 -60.0 RC New GeoDiscovery
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
extra from
IP
2021_IP_10 332RC 335497.0 7880060.0 155 0 100 100 180.0 -60.0 RC New anomaly
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
extra from
IP
2021_IP_11 333RC 335461.0 7880427.0 152 0 100 100 75.0 -60.0 RC New anomaly
---------- ------------ ------------ ------ -------- ------- ------ -------- ------ ----- ------- -------------
Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this
section.)
Criteria JORC Code explanation Commentary
Mineral
tenement * Type, reference name/number, location and ownership * The following mineral tenures are held 100% by
and land including agreements or material issues with third subsidiaries of Castillo Copper Limited, totalling an
tenure status parties such as joint ventures, partnerships, area of 736.8 km(2) in the "Mt Oxide North Project"
overriding royalties, native title interests, and as illustrated by Figure B3.
historical sites, wilderness or national park and
environmental settings.
o EPM 26574 (Valparaisa North) - encompasses the Big
One historical mineral resource, Holder Total Minerals
* The security of the tenure held at the time of Pty Ltd, granted 12-June-2018 for a 5-year period over
reporting along with any known impediments to 100 sub-blocks (323.3Km(2) ), Expires 11-June-2023.
obtaining a licence to operate in the area. o EPM 26462 (Big Oxide North) - encompasses the 'Boomerang'
historical Prospect and the 'Big One' historical mine,
Holder: QLD Commodities Pty Ltd, granted: 29-Aug-2017
for a 5-year period over 67 sub-blocks (216.5Km(2)
), Expires: 28-Aug-2022.
o EPM 26525 (Hill of Grace) - encompasses the Ayra
(previously Myally Gap) significant airborne EM anomaly,
Holder: Total Minerals Pty Ltd for a 5-year period
over 38 sub-blocks (128.8Km(2) ), Granted: 12-June-2018,
Expires: 11-June-2023.
o EPM 26513 (Torpedo Creek/Alpha Project) - Granted
13-Aug-2018 for a 5-year period over 23 sub-blocks
(74.2Km(2) ), Expires 12-Aug-2023; and
o EPMA 27440 (The Wall) - Granted on the 08-March-2021
over 70 sub-blocks (215Km(2) ) by Castillo Copper
Limited. Expires 7(th) March 2026.
FIGURE B3: CASTILLO COPPER PROSPECTS (refer to PDF
version linked above)
* A check on the tenures in 'application status' was
completed in 'GeoResGlobe' on the 15th May 2021.
================================================================= =============================================================================
Exploration
done by other * Acknowledgment and appraisal of exploration by other * Historical QDEX / mineral exploration reports have
parties parties. been reviewed for historical tenures that cover or
partially cover the Project Area in this
announcement. Federal and State Government reports
supplement the historical mineral exploration
reporting (QDEX open file exploration records).
* Most explorers were searching for Cu-Au-U, and,
proving satellite deposit style extensions to the
several small sub-economic copper deposits (e.g., Big
Oxide and Josephine).
* With the Mt Oxide North Project in regional proximity
to Mt Isa and numerous historical and active mines,
the Project area has seen portions of the historical
mineral tenure subject to various styles of surface
sampling, with selected locations typically targeted
by shallow drilling (Total hole depth is
characteristically less than 50m).
* The Mt Oxide North project tenure package has a
significant opportunity to be reviewed and explored
by modern exploration methods in a coherent package
of EPM's, with three of these forming a contiguous
tenure package.
* Various Holders and related parties of the 'Big One'
historical mining tenure (ML8451) completed a range
of mining activities and exploration activities on
what is now the 'Big One' prospect for EPM 26574. The
following unpublished work is acknowledged (and
previously shown in ASX releases' reference lists):
o Katz, E., 1970, Report on the Big One, Mt Devine,
and Mt Martin Mining Lease Prospects, Forsayth Mineral
Exploration NL, report to the Department of Mines,
CR5353, 63pp
o West Australian Metals NL, 1994. Drill Programme
at the "Big One" Copper Deposit, North Queensland for
West Australian Metals NL.
o Wilson, D., 2011. 'Big One' Copper Mine Lease 5481
Memorandum - dated 7 May 2011.
o Wilson, D., 2015. 'Big One' Mining Lease Memorandum
- dated 25 May 2015: and
o Csar, M, 1996. Big One & Mt Storm Copper Deposits.
Unpublished field report.
* The reader of the current ASX Release is referred to
the CCZ's first publication of the 1993 historical
reverse circulation drilling results for additional
diagrams and drilling information ("Historic drill
data verifies grades up to 28.40% Cu from
* The SRK Independent Geologists Report released by CCZ
on the ASX on 28-July-2020 contains further details
on the 'Exploration done by other parties -
Acknowledgment and appraisal of exploration by other
parties' this report is formally titled "A Competent
Persons Report on the Mineral Assets of Castillo
Copper Limited" Prepared as part of the Castillo
Copper Limited (ASX: CCZ, LSE: CCZ) LSE Prospectus,
with the effective date of the 17-July-2020.
================================================================= =============================================================================
Geology
* Deposit type, geological setting, and style of * The Mt Oxide North project is located within the Mt
mineralisation. Isa Inlier of western Queensland, a large, exposed
section of Proterozoic (2.5 billion- to
540-million-year-old) crustal rocks. The inlier
records a long history of tectonic evolution, now
thought to be like that of the Broken Hill Block in
western New South Wales.
* The Mt Oxide North project lies within the Mt Oxide
Domain, straddling the Lawn Hill Platform and
Leichhardt River Fault Trough. The geology of the
tenement is principally comprised of rocks of the
Surprise Creek and Quilalar Formations which include
feldspathic quartzites, conglomerates, arkosic grits,
shales, siltstones and minor dolomites and
limestones.
* The Project area is cut by a major fault zone,
trending north- northeast - south- southwest across
the permits. This fault is associated with major
folding, forming several tight synclines- anticline
structures along its length.
* The Desktop studies commissioned by CCZ on the
granted mineral tenures described four main styles of
mineralisation account for most mineral resources
within the rocks of the Mt Isa Province (after
Withnall & Cranfield, 2013).
o Sediment hosted silver-lead-zinc - occurs mainly
within fine-grained sedimentary rocks of the Isa Super
basin within the Western Fold Belt. Deposits include
Black Star (Mount Isa Pb-Zn), Century, George Fisher
North, George Fisher South (Hilton) and Lady Loretta
deposits.
o Brecciated sediment hosted copper - occurs dominantly
within the Leichhardt, Calvert, and Isa Super basin
of the Western Fold Belt, hosted in brecciated dolomitic,
carbonaceous, and pyritic sediments or brecciated rocks
proximal to major fault/shear zones. Includes the Mount
Isa copper orebodies and the Esperanza/Mammoth mineralisation.
o Iron-oxide-copper-gold ("IOCG") - predominantly chalcopyrite-pyrite
magnetite/hematite mineralisation within high grade
metamorphic rocks of the Eastern Fold Belt. Deposits
of this style include Ernest Henry, Osborne, and Selwyn;
and
o Broken Hill type silver-lead-zinc - occur within
the high-grade metamorphic rocks of the Eastern Fold
Belt. Cannington is the major example, but several
smaller currently sub-economic deposits are known.
* Gold is primarily found associated with copper within
the IOCG deposits of the Eastern Fold Belt. However,
a significant exception is noted at Tick Hill where
high grade gold mineralisation was produced, between
1991 and 1995 by Carpentaria Gold Pty Ltd, some 700
000 tonnes of ore was mined at an average grade of
22.5 g/t Au, producing 15 900 kg Au. The Tick Hill
deposit style is poorly understood (Withnall &
Cranfield, 2013).
* ROM Resources had noted in a series of recent reports
for CCZ on the granted tenures, that cover the known
mineralisation styles including:
o Stratabound copper mineralisation within ferruginous
sandstones and siltstones of the Surprise Creek Formation.
o Disseminated copper associated with trachyte dykes.
o Copper-rich iron stones (possible IOCG) in E-W fault
zones; and
o possible Mississippi Valley Type ("MVT") stockwork
sulphide mineralisation carrying anomalous copper-lead-zinc
and silver.
* The Mt Oxide and Mt Gordon occurrences are thought to
be breccia and replacement zones with interconnecting
faults. The Mt Gordon/Mammoth deposit is hosted by
brittle quartzites, and Esperanza by carbonaceous
shales. Mineralisation has been related to the Isan
Orogeny (1,590 - 1,500 Ma).
* Mineralisation at all deposits is primarily
chalcopyrite-pyrite-chalcocite, typically as massive
sulphide within breccias.
* At the Big One prospect, West Australian Metals NL
described the mineralisation as (as sourced from the
document "West Australian Metals NL, 1994. Drill
Programme at the "Big One" Copper Deposit, North
Queensland for West Australian Metals NL."):
o The targeted lode / mineralised dyke is observable
on the surface. The mineralisation targeted in the
1993 drilling programmed is a supergene copper mineralisation
that includes malachite, azurite, cuprite, and tenorite,
all associated with a NE trending fault (062(o) to
242(o) ) that is intruded by a porphyry dyke.
o The mineralised porphyry dyke is vertical to near
vertical (85(o) ), with the 'true width' dimensions
reaching up to 7m at surface.
o At least 600m in strike length, with strong Malachite
staining observed along the entire strike length, with
historical open pits having targeted approximately
200m of this strike. Exact depth of mining below the
original ground surface is not clear in the historical
documents, given the pits are not battered it is anticipated
that excavations have reached 5m to 10m beneath the
original ground surface.
o Associated with the porphyry dyke are zones of fractured
and/or sheared rock, the siltstones are described as
brecciated, and sandstones around the shear as carbonaceous.
o The known mineralisation from the exploration activities
to date had identified shallow supergene mineralisation,
with a few drillholes targeting deeper mineralisation
in and around the 200m of strike historical open cut
pits.
o A strongly altered hanging wall that contained malachite
and cuprite nodules. Chalcocite mineralization has
been identified but it is unclear on the prevalence
of the Chalcocite; and
o The mineralisation was amenable to high grade open
pit mining methods of the oxide mineralization (as
indicated by numerous historical open pit shallow workings
into the shear zone).
* Desktop studies commissioned by CCZ and completed by
ROM Resources and SRK Exploration have determined
that the Big One prospect is prospective for Cu, Co,
and Ag.
* Desktop studies commissioned by CCZ have determined
the Boomerang prospect contains:
o Secondary copper staining over 800m of strike length.
o Associated with a major east-west trending fault
that juxtaposes the upper Surprise Creek Formation
sediments against both the underlying Bigie Formation
and the upper Quilalar Formation units.
* At the 'Flapjack' prospect there is the additional
potential for:
o Skarn mineralisation for Cu-Au and/or Zn-Pb-Cu from
replacement carbonate mineralisation, particularly
the Quilalar Formation.
o Thermal Gold Auroele mineralisation is a potential
model due to the high silica alteration in thermal
aureole with contact of A-Type Weberra Granite - related
to the Au mineralisation; and/or
o IOCG mineralisation related to chloride rich fluids.
* At the 'Crescent' prospect there is the additional
potential for:
o Skarn mineralisation for Cu-Au and/or Zn-Pb-Cu from
replacement carbonate mineralisation, particularly
the Quilalar Formation; and/or
o Thermal Gold Auroele mineralisation is a potential
model due to the high silica alteration in thermal
aureole with contact of A-Type Weberra Granite - related
to the Au mineralisation; and
o IOCG mineralisation related to potassic rich fluids.
* At the 'Arya' prospect there is the additional
potential for:
o Supergene mineralisation forming at the surface along
the fault, fault breccia, and the Surprise Creek Formation
'PLrd' rock unit ('Prd' historical).
o Epigenetic replacement mineralisation for Cu (with
minor components of other base metals and gold) from
replacement carbonate mineralisation, particularly
the Surprise Creek Formation.
o Skarn mineralisation for Cu-Au and/or Zn-Pb-Cu from
replacement carbonate mineralisation, particularly
the Surprised Creek Formation.
o Sulphide mineralisation within breccia zones, along
stress dilation fractures, emplaced within pore spaces,
voids, or in other rock fractures; and/or
o IOCG mineralisation related to chloride rich fluids.
* A selection of publicly available QDEX documents /
historical exploration reports have been reviewed,
refer to Section 2, sub-section "Further Work" for
both actions in progress and proposed future actions.
* The SRK Independent Geologists Report released by CCZ
on the ASX on 28-July-2020 contains further details
on the 'Geology - Deposit type, geological setting
and style of mineralisation': this report is formally
titled "A Competent Persons Report on the Mineral
Assets of Castillo Copper Limited" Prepared as part
of the Castillo Copper Limited (ASX: CCZ, LSE: CCZ)
LSE Prospectus, with the effective date of the
17-July-2020.
================================================================= =============================================================================
Drill hole
Information * A summary of all information material to the * This ASX release concerns itself with geophysical
understanding of the exploration results including a survey whereas previous ASX releases have discussed
tabulation of the following information for all the 2020 drilling program in detail.
Material drill holes:
o easting and northing of the drill
hole collar
o elevation or RL (Reduced Level
- elevation above sea level in metres)
of the drill hole collar
o dip and azimuth of the hole
o down hole length and interception
depth
o hole length.
* If the exclusion of this information is justified on
the basis that the information is not Material and
this exclusion does not detract from the
understanding of the report, the Competent Person
should clearly explain why this is the case.
================================================================= =============================================================================
Data
aggregation * In reporting Exploration Results, weighting averaging * The new work was a ground geophysical dipole-dipole
methods techniques, maximum and/or minimum grade truncations IP survey so there was no sample to aggregate.
(e.g., cutting of high grades) and cut-off grades are
usually Material and should be stated.
* Where aggregate intercepts incorporate short lengths
of high-grade results and longer lengths of low-grade
results, the procedure used for such aggregation
should be stated and some typical examples of such
aggregations should be shown in detail.
* The assumptions used for any reporting of metal
equivalent values should be clearly stated.
================================================================= =============================================================================
Relationship
between * These relationships are particularly important in the * The strike of the dyke is at 73 degrees (east) and
mineralisation reporting of Exploration Results. variably 70-85 degrees dip to the south. The
widths and mineralised zones for copper (>500ppm) interested in
intercept drillholes range from 1m to 44m wide apparent,
lengths * If the geometry of the mineralisation with respect to averaging 9m apparent (6.8m true width). The IP
the drill hole angle is known, its nature should be survey was designed to intersect the strike of the
reported. mineralisation at a perpendicular angle.
* If it is not known and only the down hole lengths are * All mineralised intervals (i.e., >500ppm) have been
reported, there should be a clear statement to this reported in this and previous ASX releases as the
effect (eg 'down hole length, true width not known'). "as-intersected" apparent thickness (in metres) and
given that most drillholes dip at -60 degrees from
the horizontal, true intersection widths will be less,
but will be calculated during the block modelling
process.
================================================================= =============================================================================
Diagrams
* Appropriate maps and sections (with scales) and * Appropriate diagrams are presented in the body and
tabulations of intercepts should be included for any the Appendices of the current ASX Release. Where
significant discovery being reported These should scales are absent from the diagram, grids have been
include, but not be limited to a plan view of drill included and clearly labelled to act as a scale for
hole collar locations and appropriate sectional distance.
views.
* Maps and Plans presented in the current ASX Release
are in MGA94 Zone 54, Eastings (mN), and Northing
(mN), unless clearly labelled otherwise.
* A series of cross-sections were generated at Big One
displaying copper analyses in ppm to aid
interpretation and exploration planning as can be
seen in Figure B4, below, which shows the geological
section through which IP Line 3 traverses.
FIGURE B4: NORTH-SOUTH CROSS-SECTION AT BO_306RC (refer
to PDF version linked above)
================================================================= =============================================================================
Balanced
reporting * Where comprehensive reporting of all Exploration * All survey lines except Line 6 which was scrapped in
Results is not practicable, representative reporting favour of extending Line 3 are discussed in detail in
of both low and high grades and/or widths should be Appendix 3, following the JORC Table 1.
practiced to avoid misleading reporting of
Exploration Results.
================================================================= =============================================================================
Other
substantive * Other exploration data, if meaningful and material, * Several airborne EM and magnetic surveys have been
exploration should be reported including (but not limited to): conducted nearby by historical explorers and Castillo
data geological observations; geophysical survey results; Copper has conducted its own surface sampling program
geochemical survey results; bulk samples - size and prior to drilling commencing as noted above.
method of treatment; metallurgical test results; bulk
density, groundwater, geotechnical and rock
characteristics; potential deleterious or * As a result of further examination CCZ's geology team
contaminating substances. made the following recent key interpretations:
o The full assay results, which included the entire
twenty-one (21) drill-holes completed are awaiting
some clarifications and re-assay of composites before
a complete assessment of the data can be made and reported.
Surface geochem sampling plots for copper ppm (Figure
B5, below) highlight drilled and some undrilled anomalies.
o The presence of at least two mineralised lenses and
a low-grade halo (100-1,500ppm) around the main ore
body appears to hold along strike.
o For drill-holes 213RC, 301RC, 303RC, 307RC, and 313RC
the mineralisation is spread out which is significant
given the trachyte to diorite dyke is generally 4-6m
wide.
o There is more than one dyke, however they may be
offshoots of the main body. Compositions vary as rock
types logged from the chips in both 1993 and the current
campaign include trachyte, diorite, and granite (more
probably a porphyritic syenite).
o Some of the drillholes will need to be deepened (or
used as a seed hole for downhole EM) as they appear
not to have been drilled deep enough to intersect the
projected dyke at depth. The affected holes are 201RC,
202RC, 203RC, and 304RC.
o Planning for the IP Survey highlighted more target
areas near Big One to the south and south-west where
there are more trachyte dyke swarms that could be affected
by structural control.
================================================================= =============================================================================
Further work
* The nature and scale of planned further work (e.g., * Future potential work is described within the body of
tests for lateral extensions or depth extensions or the ASX Release, and will include:
large-scale step-out drilling).
o Of the current planned drilling program, eleven (11)
* Diagrams clearly highlighting the areas of possible of the reverse circulation drillholes are designed
extensions, including the main geological to target chargeability anomalies identified from
interpretations and future drilling areas, provided interpretation
this information is not commercially sensitive. of the resistivity 3D block model.
o Geological mapping and rock chip sampling over the
anomalous chargeability zones along each survey line
o Ground gravity and/or magnetic surveys.
o Reverse Circulation Drilling
o Diamond Coring.
o Block modelling and wireframing.
o Resource Estimation.
================================================================= =============================================================================
FIGURE B5: BIG ONE IP 3D SHALLOW MODEL OVERLAIN BY SURFACE
GEOCHEMICAL ASSAY RESULTS (refer to PDF version linked above)
APPIX C: APPIX 3: IP SUMMARY OF SURVEY RESULTS
INTRODUCTION
Castillo Copper retained Fender Geophysics to complete a total
of five reconnaissance lines of 50m dipole-dipole (DP-DP) Induced
Polarisation (IP) surveying over the company's Big One prospect in
May 2021. The location of the planned versus actual lines are shown
in black on Figure C1 and Figure C3 with respect to the mapped dyke
(blue), copper assays (orange) and mapped geology (black
lines).
FIGURE C1: BIG ONE IP SURVEY TRAVERSE LINES (refer to PDF
version linked above)
Due to the mine being privately held under mining lease (ML5481,
now defunct) historical work has focussed on drilling and
geochemical sampling, with no detailed geophysical data
collection.
The copper intersected to date appears to be associated with a
NE-SW trending dyke. It occurs in two zones - oxidised (malachite,
azurite, tenorite, cuprite) and chalcocite. The aim of the IP
survey was to ascertain if the copper mineralisation intersected to
date has a discernible electrical response (chargeable and / or
conductive). If so, it is hoped that other zones of similar
electrical response can be highlighted to better focus the upcoming
drill program. As drilling had occurred along the main
trachyte/microsyenite dyke, calibration of the resistivity and
chargeability responses was possible.
Six lines were originally planned to be acquired over
intersected mineralisation associated with the dyke, however due to
anomalous readings located at the end of lines, Lines 1 and 3 were
extended in a NW direction, therefore Line 6 was not acquired at
this stage. The lines are orientated NW-SE (perpendicular to the
dyke) and spaced between 100 - 150m apart. Figure C3 displays the
regional magnetic data (1991 MIM dataset).
Not unexpectedly, the copper mineralisation intersected to date
does not display a mappable magnetic response, likely the result of
the regional nature of the available magnetics. The highest
intensity magnetic response is located to the east of the region of
interest and thought to reflect possible underlying Eastern Creek
Volcanics. Interestingly, the copper mineralisation appears to be
associated with the north-western edge of the magnetic feature. The
acquisition of detailed magnetics at appropriate line spacing
should be considered.
Figure C2 illustrates the available open file airborne EM
surveys from the QLD Department of Resources. There is no airborne
EM coverage at Big One.
FIGURE C2: OPEN FILE AIRBORNE EM SURVEYS (refer to PDF version
linked above)
Figure C3 displays the regional magnetic data (1991 MIM Open
Range Survey). Not unexpectedly, the copper mineralisation
intersected to date does not display a mappable magnetic response,
likely the result of the regional nature of the available
magnetics. The highest intensity magnetic response is located to
the east of the region of interest and thought to reflect possible
underlying Eastern Ck Volcanics. Interestingly, the copper
mineralisation appears to be associated with the north-western edge
of the magnetic feature. The acquisition of detailed magnetics at
appropriate line spacing should be considered.
FIGURE C3: REDUCED TO POLE REGIONAL MAGNETICS WITH HIGH PASS
(4KM) FILTER APPLIED (refer to PDF version linked above)
Figure C4 illustrates modelling of the regional magnetic data
(1991 MIM Open Range Survey) along traverse Line 4. The section is
looking east.
FIGURE C4: LINE 4 MODELLED TMI AND DRILLING (refer to PDF
version linked above)
The depth of penetration of the survey was between 160-180m
below the surface, that showed that mineralisation on some lines
extended beyond these depths. Figures C5 and C6 show cross-sections
of chargeability in mV/V for Lines 3 and 4, showing existing
drilling, additional undrilled and unmapped anomalies, and proposed
drilling.
FIGURE C5: LINE 3 CHARGEABILITY AND PROPOSED DRILLING (YELLOW)
(refer to PDF version linked above)
FIGURE C6: LINE 4 CHARGEABILITY AND PROPOSED DRILLING (YELLOW)
(refer to PDF version linked above)
2D IP Chargeability and Resistivity Modelling
2D chargeability and resistivity modelling were then undertaken
on the data using the Geotomo "RES2DINV" software tools. The tool
allows data QC as well as inverse modelling to determine 2-D
resistivity and IP models for the subsurface. A final check made
there to remove any obvious outliers in the data prior to modelling
and after first initial model run. The initial modelling was
undertaken using a fine mesh (half unit dipole), smooth model
inversion and a second model run and 12.5m cell size. IP
chargeability was modelled for channels 10 - 15.
The smooth model output produces model changes in a smooth
manner and minimises the difference between measured and calculated
results point by point. The level of detail returned in the smooth
IP models is high, especially near surface.
To allow direct comparison between profiles, the same
resistivity colour-stretch has been applied to each line of the
DP-DP survey. Resistive regions in the 2D models are displayed in
warm colours, conductive regions in cool colours (top model) and
regions of high chargeability are displayed with warm colours
(bottom model). Topography has been included in all the models.
The 2D modelling indicates a maximum depth penetration of around
150 - 180 m (at N=10). Modelled 2D chargeability was found to range
between 0 - 15 mV/V with several weak to moderate chargeable zones
/ trends mapped in the top 150m.
The 2D modelling of this survey data indicates a variably
resistive response with sone regions of higher conductivity noted
in the top 25 - 50m, particularly in topographically low regions
likely to reflect clays associated drainage. The variably resistive
basement is also interrupted in places, with regions of elevated
conductivity (indicative of faults / possible association with
mineralisation).
Results from line 3 (10400) and Line 4 (10300), as shown in
Figures C5 and C6, indicate that the mineralisation is weak to
moderately chargeable and generally resistive (but may be
associated with structures displaying slight decrease in
resistivity). It appears that the drilling undertaken to date
proximal to Line 4 (10300) and Line 5 (10150) have not adequately
tested areas of elevated chargeability. Several untested zones of
elevated chargeability are also mapped on the northern lines.
It is recommended that where modelling indicates elevated
chargeability occurs near surface, that the response be checked in
the field to see if it can be explained by lithology. It is
important to note that not all chargeable anomalies will reflect
mineralisation - typically clays, uneconomic sulphides and some
lithologies such as shales can also give chargeable responses.
3D IP Chargeability and Resistivity Modelling
3D modelling was undertaken to obtain an improved representation
of the chargeability distribution in 3D. Topography was included in
the 3D modelling. Although the 3D modelling is a compromise in that
you lose some of the detail along line (evident in the 2D models)
due to the necessary increased cell size, the benefits of 3D model
output include ability to map trends between lines (useful for
mapping stratigraphy and potential structures) as well as the model
output may give indications of anomalies between lines.
The DP-DP profiles were input into a 3D modelling package
"Res3DInv". This package uses the smoothness-constrained
least-squares inversion technique to produce a 3D model of the
subsurface chargeability and resistivity. Whilst the output
displays slightly less detail than the 2D smooth sections along
line, more continuity of anomalies is noted, especially between
lines.
The output from the "Res3DInv" model was imported into Geosoft,
clipped to data boundaries and topography and regular depth slices
(20m intervals) through the 3D chargeability and resistivity model
output, as well as sections were extracted at regular intervals. A
representative snapshot of output from Res3DInv is shown in Figure
C7, at a representative 40m depth slice and tilt-filtered through
the 3D chargeability model.
Several shallow and deeper trends are evident in the data. These
have been highlighted by applying a tilt derivate to the model
output in in the figure. It is thought that these trends may
reflect structures that may be important in understanding the
mineralisation control.
FIGURE C7: SHALLOW CHARGEABILITY AND PROPOSED 2021 DRILLING
(WHITE DOTS). (refer to PDF version linked above)
Conclusions & Recommendations
3D inversion modelling of available IP sections acquired at the
Big One prospect has been undertaken to provide an improved
representation to the resistivity and chargeability distribution in
the 3D space. In general, results are broadly like the detailed 2D
section modelling (previous section) although there is a slight
decrease in resolution along line, particularly near surface. This
is to be expected with 3D modelling. The benefit of the 3D
modelling is that more continuity is noted between lines and the
centre of anomalies have been shifted to between line in some
places.
The 3D modelling indicates the maximum depth of investigation of
the DP-DP survey is likely to be around 150 - 180m at N=10. The
known copper mineralisation displays a weak to moderate chargeable
response and is generally resistive (although also appears to be
proximal to a slight increase in conductivity which may reflect
shears / structures).
It should be noted that whilst there is typically a direct
correlation between chargeability and sulphide / clay
concentration, it does not necessarily correlate to economic
mineralisation. Lower amplitude chargeable anomalies can be of
interest. It should also be recognised that a lower amplitude
anomaly may simply reflect a deeper source (less power reaching
source at greater depths).
Chargeable zones modelled at or near surface should be field
verified to see if the response can be explained by lithology or
evidence of sulphides. It is therefore recommended that the IP
model output be reviewed in conjunction with other auxiliary
datasets such as field mapping geochemistry and structural
interpretation. Acquisition of detailed magnetics and gravity data
would also assist structural interpretations.
In addition to the region of known mineralisation, it is
recommended that the chargeability output be used to better target
the continuation of chargeable trends (proximal to the dyke). A
possible low - moderately chargeable off-shoot is also mapped
adjacent and to the SW of the main known mineralised body and is
worthy of further testing. To the north of the dyke, some higher
chargeable responses are also noted. These features should be
ground-truthed to see if they can be explained by a mapped
sedimentary copper horizon.
As a result of the evaluation of data from the IP surveys
carried out, the following recommendations are made:
-- The 2D section models are likely to give the most accurate
representation of the earth's conductivity and chargeability
variations and should be used when drill targeting. The 3D model
output allows trends and structures to be mapped and may give some
indications of off-line anomalies.
-- Treat anomalies on the edge of lines (and at depth) with
caution. Although care was taken to remove spurious data, some edge
effects may persist in the data. Before testing any anomalies,
GeoDiscovery can check the raw data to verify if a particular
anomaly likely to be real.
-- 50m DP-DP is shown to be a cost-effective method to cover
ground relatively quickly and map the electrical properties of the
top 150m or so. If drill testing the regions of elevated
chargeability proves successful, a larger 100m DP-DP or P-DP
campaign may be considered to cover more ground and to greater
depth.
-- Incorporate the 3D and 2D IP models into the available
geological database to determine the extent to which the chargeable
zones may or may not have been tested, as well as their geological
/ stratigraphic significance.
-- It is recommended that where IP anomalies occur near surface,
a field visit is undertaken to see if anomaly can be explained by
surficial clays / lithology.
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