Heron Resources Limited (ASX:HRR TSX:HER, “Heron” or the
“Company”) is pleased to provide initial results from the
drilling program completed at its wholly-owned Woodlawn Project,
located 250km south-west of Sydney, New South Wales,
Australia. A total of eight diamond core holes were completed
for 2,527m.
This drilling program comprised:
1) Step out testing of the B Lens to the north
where previous drilling on this high priority target had been
hampered by drill pad access, due to an evaporation dam.
2) Shallow holes in the G Lens system to probe
for extensions to lenses, that may add resources which would
further support the early stages of the underground mine
schedule.
Commenting on these latest results, Heron Managing Director and
CEO, Mr Wayne Taylor, said:
“The completion of the Woodlawn Feasibility Study has provided
Heron with the opportunity to pursue a number of prospective
targets in and around Woodlawn that could extend the resource and
optimise the mine schedule. The initial results have been extremely
encouraging and support our view that this mineralised system has
much more to deliver. The G2 Lens and a possible new lens in the
hanging wall of G2 are very close to surface, providing an
excellent opportunity to add to the early production from the
underground while the B Lens north and adjacent Cowley Hills
prospect both represent significant potential additions to the
medium term schedule.”
- Eight diamond holes totalling 2,527m
- Assays received to-date are only for two holes in this program
and recorded a very significant intercept in the shallow G2 Lens
position (potential additions to the Mineral Resource statement):
- 11m @ 11% ZnEq[1] from 133m (6.3% Zn, 0.5% Cu, 3.3% Pb, 0.1g/t
Au, 10g/t Ag) - WNDD0106
- Other significant base metal sulphide intersections logged
geologically, assays pending, include:
- 4m of polymetallic sulphides from 552m (B Lens extension) -
WNDD0108
- 7m of polymetallic and Cu stringer sulphides from 570m (B Lens
extension) - WNDD0108
- 0m of Zn stringer and polymetallic sulphides from 109m (G2
hanging wall) - WNDD0110
- 1m of Zn stringer sulphides from 140m (G2 Lens extension) -
WNDD0110
- 75m of massive Cu-rich sulphides from 178m (G2 Lens extension)
- WNDD0111
- From Cowley Hills, positioned 2 km to the north of Woodlawn in
the same prolific host rocks:
- 6m of Cu and Zn stringer and semi-massive sulphides from 205m
(Cowley Hills) - CHDD0001
- Significant DHEM conductors from drill hole WNDD0105 indicating
potential for B Lens continuity to the north
- Significant DHEM conductor from the down-hole survey in the
Cowley Hills prospect showing potential for continuity of
mineralisation to 170m vertical depth below old workings
[1] ZnEq% used in this release refers to the calculated Zn
equivalent grade based on the Zn, Cu, Pb, Au and Ag grades, the
formula for which is provide in Appendix 2 at the end of this
report.
B Lens North Drilling
As reported in Heron’s June quarterly report, the first hole
(WNDD0105) of the current program intersected a zone of
polymetallic sulphides over 1.2m in width within a broader 4.5m of
stringer sulphides from 538m depth. This intercept confirms
the extension of the B Lens horizon in this northerly direction and
represents a step-out of over 100m from existing drilled
mineralisation. Three thinner (10-30cm) zones of polymetallic
massive sulphides were intersected at 516m, 526m and 547m depth
often with faulted contacts indicating the possible presence of
relatively broad zones of sulphide mineralisation with the volcanic
package. Assay results were as follows (details are provided
in Appendix 1):
- 5m @ 5.8% ZnEq from 538m (2.3% Zn, 0.8% Cu, 0.5% Pb,
0.2g/t Au, 13.1g/t Ag) - WNDD0105
A down hole electromagnetic (DHEM) survey on WNDD0105 resulted
in three plates being modelled (Figure 1):
- Plate 1 is related to the in-hole mineralisation and measures
approximately 70m x 70m with a conductance of 25S.
- Plates 2 and 3 relate to a broad off-hole response and measure
approximately 250m x 150m with a conductance of 50S.
- The modelling indicates that the bulk of the conductivity is
south of the hole, towards the mined B Lens position and with Plate
2 being in part related to the known mineralisation of B Lens.
As shown in Figure 1, there is potential for a substantial
volume of mineralisation in the zone defined by the DHEM plates to
the north of B Lens with historic hole, W151, and current hole,
WNDD0105, interpreted to be close to the current outer
limits.
WNDD0108 was drilled to intersect towards the northern edge of
the modelled EM plates (Figure 1) and returned two significant
intercepts:
- 4m of massive polymetallic sulphides from 552m -
WNDD0108
- 7m of massive polymetallic and Cu stringer sulphides
from 570m (incl. 3m internal waste) - WNDD0108
The upper mineralisation is expected to grade well and may
represent the edge of a previously unrecognised lens in the hanging
wall to B Lens. The 10.7m lower intercept is the main B Lens
and demonstrates the potential for a substantial tonnage in this
zone and confirms the extension of B Lens to the north.
Figure 1: Oblique long-section (looking approximately
east) for the northern end of the B Lens position, showing location
of WNDD0105, DHEM plates and earlier drilling.
http://www.globenewswire.com/NewsRoom/AttachmentNg/3c451ca3-0128-4dbb-bba4-3f9544755d49
G2 Lens Drilling
Five holes (Figure 2) have been completed on the G2 Lens
position targeting shallow extensions to known
mineralisation. A very significant intercept was returned in
WNDD0106 located 50m down dip from the Mineral Reserve:
- 11m @ 11% ZnEq from 133m (6.3% Zn, 0.5% Cu, 3.3%Pb,
0.1g/t Au, 10g/t Ag) - WNDD0106
Other sulphide intersections where assays are pending
include:
- 6m of pyritic sulphides with minor Zn/Cu from 148m -
WNDD0107
- 0m of weak Zn stringer sulphides from 130m -
WNDD0109
- 0m of Zn stringer and massive polymetallic sulphides
from 109m (potential new lens) - WNDD0109
- 1m of Zn stringer sulphides from 140m -
WNDD0110
- 75m of massive Cu-rich sulphides from 178m -
WNDD0111
The massive sulphides intersected at 109m in WNDD0110 are very
significant, visually appear to be very high grade, and may be
related to a new lens position in the hanging wall to the G2
Lens.
The lower intercept at 140m in WNDD0110 is a more typical G2
Lens intercept consisting of 1-10cm wide zinc sulphide stringers
(sphalerite) with pyrite and lesser Pb and Cu sulphides above a
chloritically altered footwall with finer sulphide stringers. A
weaker zone of Cu and Zn sulphide stringers also exists at 200m in
this hole.
The G2 Lens (Figures 2 and 3) is open down-dip, with very little
drilling having been undertaken on the zone previously. Given
the shallow position of the lens, it is potentially an important
contributor in the early years of the operation.
Metallurgical test work is currently being performed on the
sphalerite stringer material and recoveries are expected to be in
line with or better than other Woodlawn massive sulphides given the
generally coarser grained nature of this style of
mineralisation.
Drill core photos of the WNDD0106 mineralisation are provided in
Appendix 2.
Figure 2: G2 Lens long-section showing existing
lens shape and recent drilling.
http://www.globenewswire.com/NewsRoom/AttachmentNg/ec2b57cf-b9ae-455a-ab2b-ec4b19f6a65b
Figure 3: G2 Lens Cross Section, showing result in
WNDD0106 and surrounding holes.
http://www.globenewswire.com/NewsRoom/AttachmentNg/82295e75-5bfa-4f49-b86d-3d7c307dde30
Cowley Hills DHEM Target
The Cowley Hills prospect is located 2km north of Woodlawn and
consists of a Woodlawn-style VMS deposit that was partially mined
from underground in 1990 (35,000t extracted). A single
historical hole drilled in 1985, W158, was surveyed with high
powered DHEM as part of the current program and resulted in the
modelling of a 60m x 80m sized plate located in the down-dip
position of the known mineralisation (Figure 4).
Combining the DHEM, historical drilling and known limits of
mined stopes there is potential at Cowley Hills for a zone of
mineralisation measuring 80m along strike and 170m down dip.
Given the similarities with the Woodlawn mineralisation there is
potential to extend this further; however, the controls on the lens
have not been well established.
A single hole was drilled to test this lower zone of
mineralisation and provide a sample for metallurgical test
work. A significant sulphide intersection was returned:
- 6m of Cu and Zn stringer and semi-massive sulphides
from 205m - CHDD0001
The intercept consisted of fine-grained pyrite and base-metal
sulphides hosted in a strongly chlorite altered basalt unit with a
sharp footwall contact marked by an intrusive dolerite unit.
The potential for a Mineral Resource at Cowley Hills is being
assessed including the possibility of accessing the ore from an
open-pit position which would have the potential to supply
production feed during the early years of the Woodlawn
operation.
Figure 4: Cowley Hills Prospect, long-section looking
east showing existing mine workings, drilling and location of the
DHEM plate.
http://www.globenewswire.com/NewsRoom/AttachmentNg/31c8483e-e72a-49f2-b608-724fa156bbc1
About Heron Resources Limited:
Heron’s primary focus is the development of its 100% owned, high
grade Woodlawn Zinc-Copper Project located 250km southwest of
Sydney, New South Wales, Australia. In addition, the Company holds
a significant high quality, gold and base metal tenement holding in
New South Wales and Western Australia.
Compliance Statement (JORC 2012 and
NI43-101)
The technical information in this report relating to the
exploration results is based on information compiled by Mr. David
von Perger, who is a Member of the Australian Institute of Mining
and Metallurgy (Chartered Professional – Geology). Mr. von Perger
is a full time employee of Heron Resources Limited and has
sufficient experience, which is relevant to the style of
mineralisation and type of deposit under consideration and to the
activity which he is undertaking to qualify as a Competent Person
as defined in the 2012 edition of the “Australasian Code for
Reporting of Exploration Results and “qualified person” as this
term is defined in Canadian National Instrument 43-101 (“NI
43-101”). Mr. von Perger has reviewed this press release and
consents to the inclusion in this report of the information in the
form and context in which it appears.
CAUTIONARY NOTE REGARDING FORWARD-LOOKING
INFORMATION
This report contains forward-looking statements and
forward-looking information within the meaning of applicable
Canadian securities laws, which are based on expectations,
estimates and projections as of the date of this report. This
forward-looking information includes, or may be based upon, without
limitation, estimates, forecasts and statements as to management’s
expectations with respect to, among other things, the timing and
amount of funding required to execute the Company’s exploration,
development and business plans, capital and exploration
expenditures, the effect on the Company of any changes to existing
legislation or policy, government regulation of mining operations,
the length of time required to obtain permits, certifications and
approvals, the success of exploration, development and mining
activities, the geology of the Company’s properties, environmental
risks, the availability of labour, the focus of the Company in the
future, demand and market outlook for precious metals and the
prices thereof, progress in development of mineral properties, the
Company’s ability to raise funding privately or on a public market
in the future, the Company’s future growth, results of operations,
performance, and business prospects and opportunities. Wherever
possible, words such as “anticipate”, “believe”, “expect”,
“intend”, “may” and similar expressions have been used to identify
such forward-looking information. Forward-looking information is
based on the opinions and estimates of management at the date the
information is given, and on information available to management at
such time. Forward-looking information involves significant risks,
uncertainties, assumptions and other factors that could cause
actual results, performance or achievements to differ materially
from the results discussed or implied in the forward-looking
information. These factors, including, but not limited to,
fluctuations in currency markets, fluctuations in commodity prices,
the ability of the Company to access sufficient capital on
favourable terms or at all, changes in national and local
government legislation, taxation, controls, regulations, political
or economic developments in Canada, Australia or other countries in
which the Company does business or may carry on business in the
future, operational or technical difficulties in connection with
exploration or development activities, employee relations, the
speculative nature of mineral exploration and development,
obtaining necessary licenses and permits, diminishing quantities
and grades of mineral reserves, contests over title to properties,
especially title to undeveloped properties, the inherent risks
involved in the exploration and development of mineral properties,
the uncertainties involved in interpreting drill results and other
geological data, environmental hazards, industrial accidents,
unusual or unexpected formations, pressures, cave-ins and flooding,
limitations of insurance coverage and the possibility of project
cost overruns or unanticipated costs and expenses, and should be
considered carefully. Many of these uncertainties and contingencies
can affect the Company’s actual results and could cause actual
results to differ materially from those expressed or implied in any
forward-looking statements made by, or on behalf of, the Company.
Prospective investors should not place undue reliance on any
forward-looking information. Although the forward-looking
information contained in this report is based upon what management
believes, or believed at the time, to be reasonable assumptions,
the Company cannot assure prospective purchasers that actual
results will be consistent with such forward-looking information,
as there may be other factors that cause results not to be as
anticipated, estimated or intended, and neither the Company nor any
other person assumes responsibility for the accuracy and
completeness of any such forward-looking information. The Company
does not undertake, and assumes no obligation, to update or revise
any such forward-looking statements or forward-looking information
contained herein to reflect new events or circumstances, except as
may be required by law.
No stock exchange, regulation services provider,
securities commission or other regulatory authority has approved or
disapproved the information contained in this report.
Appendix 1
http://www.globenewswire.com/NewsRoom/AttachmentNg/c8b44a34-7f7e-42a5-b352-259f7912bbe6
Drill core photos from WNDD0106: Zn%, Cu%, Pb%
grades are shown and have been derived from a hand-held XRF Niton
device that provides approximate metal grades for a particular
point of the core. The grades shown are indicative only and
are not in any way meant to provide average grades for specific
intervals. The actual grade for the broader interval (as
reported above) was 11m @ 6.3% Zn, 0.5% Cu, 3.3%Pb, 0.1g/t
Au, 10g/t Ag (11% ZnEq) from 133m. The rocks consist
of strongly altered, moderately foliated dacitic volcanic derived
mudstones (light colours) and chloritic schist (dark green/black)
with stringers of semi-massive sphalerite (reddish) and pyritic
(golden) sulphides.
Appendix 2
Drill hole details for diamond drill holes completed as part of
the Phase III drill campaign.
| Hole No. |
WMGEast (m) |
WMGNorth (m) |
WMGRL (m) |
Surface Dip |
WMG SurfaceAzimuth |
EOHDepth (m) |
Target |
| WNDD0105 |
8973 |
19718 |
2786 |
-70 |
076 |
633.7 |
Northern B Lens horizon |
| WNDD0106 |
9187 |
19202 |
2795 |
-60 |
115 |
167.0 |
G2 Lens down plunge |
| WNDD0107 |
9187 |
19202 |
2795 |
-67 |
088 |
170.0 |
G2 Lens down plunge |
| WNDD0108 |
8974 |
19720 |
2786 |
-75 |
090 |
633.8 |
B Lens south WNDD0105 |
| WNDD0109 |
9153 |
19217 |
2791 |
-68 |
132 |
255.7 |
G2 Lens down-dip WwwwWWWNDD0106 |
| WNDD0110 |
9175 |
19206 |
2795 |
-72 |
105 |
222.7 |
G2 Lens down-dip |
| WNDD0111 |
9170 |
19211 |
2795 |
-72 |
83 |
205.1 |
G2 Lens down-dip WNDD0110 |
| CHDD0001 |
10541 |
21967 |
2825 |
-60 |
80 |
238.8 |
Targeting EM plate |
Notes: WMG = Woodlawn Mine Grid
Zinc equivalent calculation
The zinc equivalent ZnEq calculation takes into account, mining
costs, milling costs, recoveries, payability (including transport
and refining charges) and metal prices in generating a Zinc
equivalent value for Au, Ag, Cu, Pb and Zn. ZnEq =
Zn%+Cu%*3.12+Pb%*0.81+*Au g/t*0.86+Ag g/t*0.03
Metal prices used in the calculation are: Zn US$2,300/t, Pb US$
2,050/t, Cu US$6,600/t, Au US$1,250/oz and Ag US$18/oz. It is
Heron’s view that all the metals within this formula are expected
to be recovered and sold.
| Hole No |
From (m) |
To (m) |
Downhole Width (m) |
Estimated True Width (m) |
ZnEq% |
Zn (%) |
Cu (%) |
Pb (% |
Au (g/t) |
Ag (g/t) |
|
| |
| WNDD0105 |
526.0 |
527.5 |
1.5 |
1.2 |
5.2 |
3 |
0.2 |
1.1 |
0.1 |
18.2 |
|
| WNDD0105 |
537.7 |
542.2 |
4.5 |
3.6 |
5.8 |
2.3 |
0.8 |
0.5 |
0.2 |
13.1 |
|
| WNDD0106 |
132.7 |
143.6 |
10.9 |
8.7 |
11 |
6.3 |
3.3 |
0.5 |
0.1 |
10.4 |
|
Notes: True width is an estimate of the actual thickness of the
intercept based on interpreted lens orientation (approximately 80%
to 90% of downhole width, with 80% used in this table as a general
guide); grades are weighted average grades, weighted by length of
samples intervals downhole, which are nominally 1 metre. No
weighting was applied for differences in specific gravity.
JORC 2012 Table 1
Section 1 Sampling Techniques and Data
(Criteria in this section applies to all succeeding
sections)
| Criteria |
JORC Code explanation |
Commentary |
| Sampling techniques |
· Nature and quality of sampling (eg cut
channels, random chips, or specific specialised industry standard
measurement tools appropriate to the minerals under investigation,
such as down hole gamma sondes, or handheld XRF instruments, etc).
These examples should not be taken as limiting the broad meaning of
sampling.· Include reference to measures taken to ensure
sample representivity and the appropriate calibration of any
measurement tools or systems used.· Aspects of the
determination of mineralisation that are Material to the Public
Report. |
· Samples from the diamond-core holes are
being taken from mostly HQ3 and NQ3 sized core and sampled on a
nominal 1 metre basis taking into account smaller sample intervals
up to geological contacts. The core is cut in half along the
core orientation line (where available) and in massive sulphide
zones one portion is quartered for assaying, half the core is
preserved for metallurgical testing and the remaining quarter is
retained as reference material in the core trays. In
non-massive sulphide material half core is sampled.· These
sampling methods are standard industry methods and are believed to
provide acceptably representative samples for the type of
mineralisation encountered. |
| Drilling techniques |
· Drill type (eg core, reverse circulation,
open-hole hammer, rotary air blast, auger, Bangka, sonic, etc) and
details. |
· Diamond-core drilling is being undertaken
by Sandvik UDR650 rigs with mostly HQ3 sized core being
drilled. Various techniques are employed to ensure the hole
is kept within limits of the planned position. The core is
laid out in standard plastic cores trays. |
| Drill sample recovery |
· Method of recording and assessing core
and chip sample recoveries and results assessed. |
· The core is transported to an enclosed
core logging area and recoveries are recorded. Recoveries to
date have been better than 95%. The core is orientated where
possible and marked with 1 metre downhole intervals for logging and
sampling. |
| Logging |
· 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. |
· The diamond core is geologically logged
by qualified geologists. Geotechnical logging is also being
undertaken on selected sections of the core. Samples for
metallurgical testing are being kept in a freezer to reduce
oxidation prior to being transported to the metallurgical
laboratory. |
| Sub-sampling techniques and sample
preparation |
· For all sample types, the nature, quality
and appropriateness of the sample preparation technique. |
· All core samples are crushed then
pulverised in a ring pulveriser (LM5) to a nominal 90% passing 75
micron. An approximately 250g pulp sub-sample is taken from the
large sample and residual material stored.· A quartz flush
(approximately 0.5 kilogram of white, medium-grained sand) is put
through the LM5 pulveriser prior to each new batch of
samples. A number of quartz flushes are also put through the
pulveriser after each massive sulphide sample to ensure the bowl is
clean prior to the next sample being processed. A selection
of this pulverised quartz flush material is then analysed and
reported by the lab to gauge the potential level of contamination
that may be carried through from one sample to the next. |
| Quality of assay data and laboratory tests |
· The nature, quality and appropriateness
of the assaying and laboratory procedures used and whether the
technique is considered partial or total.· Nature of quality
control procedures adopted (eg standards, blanks, duplicates,
external laboratory checks) and whether acceptable levels of
accuracy (ie lack of bias) and precision have been
established. |
· Sample preparation and assaying is being
conducted through ALS Laboratories, Orange, NSW with certain final
analysis of pulps being undertaken at the ALS Laboratory in
Brisbane QLD.· Gold is determined by 30g fire assay fusion
with ICP-AES analysis to 1ppb LLD.· Other elements by mixed
acid digestion followed by ICP-AES analysis. ·
Laboratory quality control standards (blanks, standards and
duplicates) are inserted at a rate of 5 per 35 samples for ICP
work. |
| Verification of sampling and assaying |
· The verification of significant
intersections by either independent or alternative company
personnel.· Documentation of primary data, data entry
procedures, data verification, data storage (physical and
electronic) protocols.· Discuss any adjustment to assay
data. |
· An internal review of results was
undertaken by Company personnel. No independent verification
was undertaken at this stage.· All field and laboratory data
has been entered into an industry standard database using a
contract database administrator (DBA) in the Company’s Perth
office. Validation of both the field and laboratory data is
undertaken prior to final acceptance and reporting of the
data.· Quality control samples from both the Company and the
Laboratory are assessed by the DBA and reported to the Company
geologists for verification. All assay data must pass this
data verification and quality control process before being
reported. |
| Location of data points |
· Accuracy and quality of surveys used to
locate drill holes (collar and down-hole surveys), trenches, mine
workings and other locations used in Mineral Resource
estimation. |
· The drill collars were initially located
with a combination of handheld GPS and licenced surveyor using a
DGPS system, with accuracy of about 1m. The final drill
collars are “picked up” by a licenced surveyor with accuracy to 1
centimetre.· While drilling is being undertaken, downhole
surveys are conducted using a downhole survey tool that records the
magnetic azimuth and dip of the hole. These recordings are
taken approximately every 30 metres downhole. Where possible
holes are also being surveyed with gyroscopic methods, with some 80
percent of holes drilled in the current program also surveyed by
this method after drilling has been completed. |
| Data spacing and distribution |
· Data spacing for reporting of Exploration
Results.· Whether the data spacing and distribution is
sufficient to establish the degree of geological and grade
continuity appropriate for the Mineral Resource and Ore Reserve
estimation procedure(s) and classifications applied.· Whether
sample compositing has been applied. |
· The diamond drilling is mostly
following-up in various directions from previous intercepts with a
nominal spacing in the range 30-40m. This drill hole spacing
will be sufficient to provide Mineral Resource estimates in the
future. |
| Orientation of data in relation to geological
structure |
· Whether the orientation of sampling
achieves unbiased sampling of possible structures and the extent to
which this is known, considering the deposit type. |
· The drilling orientation is designed to
intersect the mineralised lenses at a close to perpendicular
angle. The mineralised lenses are dipping at approximately
50-70 degrees to the west and the drilling is approximately at 60
degrees to the east. This will vary from hole to hole. |
| Sample security |
· The measures taken to ensure sample
security. |
· Samples are being secured in green
plastic bags and are being transported to the ALS laboratory in
Orange, NSW via a courier service or with Company
personnel/contractors. |
| Audits or reviews |
· The results of any audits or reviews of
sampling techniques and data. |
· A review and assessment of the laboratory
procedures was under taken by Company personnel in late 2014
resulting in some changes to their sample pulverising
procedure. |
Section
2
Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this
section.)
| Criteria |
JORC Code explanation |
Commentary |
| Mineral tenement and land tenure status |
· Type, reference name/number, location and
ownership including agreements or material issues with third
parties such as joint ventures, partnerships, overriding royalties,
native title interests, historical sites, wilderness or national
park and environmental settings.· The security of the tenure
held at the time of reporting along with any known impediments to
obtaining a licence to operate in the area. |
· The Woodlawn project is located 200km
south-west of Sydney in the state of New South Wales. The
area is near the top of the Great Australian Dividing range and has
an elevation around 800m above sea-level. The mineral and
mining rights to the project are owned 100% by the Company through
the granted, special (Crown and Private Land) mining lease 20
(SML20). The lease has been renewed to the 16 November
2029.· The project area is on private land owned by Veolia
who operate a waste disposal facility that utilises the historical
open-pit void. An agreement is in place with Veolia for the
Company to purchase certain sections of this private land to
facilitate future mining and processing activities. A
cooperation agreement is also in place between Veolia and the
Company that covers drilling and other exploration activities in
the area. |
| Exploration done by other parties |
· Acknowledgment and appraisal of
exploration by other parties. |
· The Woodlawn deposit was discovered by
the Jododex JV in 1970 and open-pit mining began in 1978 and
continued through to 1987. The project was bought outright by Rio
Tinto Ltd (CRA) in 1984 who completed the open-pit mining.
Underground operations commenced in 1986 and the project was sold
to Denehurst Ltd in 1987 who continued underground mining up until
1998. The mineral rights to the project were then acquired by
TriAusMin Ltd in 1999 who conducted studies on a tailings
re-treatment process and further underground operations.
Heron took 100% ownership of the project in August 2014 following
the merger of the two companies. Some 980 surface and
underground drill holes have been completed on the project to date
and various studies undertaken. |
| Geology |
· Deposit type, geological setting and
style of mineralization. |
· The Woodlawn deposit comprises
volcanogenic massive sulphide mineralisation consisting of
stratabound lenses of pyrite, sphalerite, galena and
chalcopyrite. The mineralisation is hosted in the Silurian
aged Woodlawn Felsic Volcanic package of the Goulburn sub-basin on
the eastern side of the Lachlan Fold Belt. |
| Drill hole Information |
o A summary of all information material to
the understanding of the exploration results including a tabulation
of the following information for all Material drill holes: |
· A table detailing the drill hole
information is given in the body of the report. |
| Data aggregation methods |
· In reporting Exploration Results,
weighting averaging techniques, maximum and/or minimum grade
truncations (eg 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 reported assays are weighted for
their assay interval width. The majority of the assay interval
widths are 1 metre, but this weighting does take into account the
non 1 metre intervals and weights the average assay results
accordingly.· For the results reported here no weighting was
included for specific gravity (SG) measurements that have been
taken for all sample intervals as the samples within the intervals
are of a similar SG. |
| Relationship between mineralization widths and
intercept lengths |
· These relationships are particularly
important in the reporting of Exploration Results.· If the
geometry of the mineralisation with respect to the drill hole angle
is known, its nature should be reported. |
· The massive sulphide zone intercepted in
the drilling to date is at an angle to the drill axis and therefore
the true width is estimated to be some 0.8 of down-hole
width. That is, a down-hole intercept of 16m equates to a
true width of 12m. This is only an approximation at this
stage and will be better estimated as the orientation of the Lenses
is better defined. |
| Diagrams |
· Appropriate maps and sections (with
scales) and tabulations of intercepts should be included for any
significant discovery being reported These should include, but not
be limited to a plan view of drill hole collar locations and
appropriate sectional views. |
· Where relevant, a diagram showing the
hole positions relevant for current phase of exploration is
included in the release. Other maps and diagrams showing the
location of the Woodlawn Project are included in other recent
Company releases. |
| Balanced reporting |
· Where comprehensive reporting of all
Exploration Results is not practicable, representative reporting of
both low and high grades and/or widths should be practiced to avoid
misleading reporting of Results. |
· The reporting is considered to be
balanced and all relevant results have been disclosed for this
current phase of exploration. |
| Other substantive exploration data |
· Other exploration data, if meaningful and
material, should be reported including (but not limited to):
geological observations; geophysical survey results; geochemical
survey results; bulk samples – size and method of treatment;
metallurgical test results; bulk density, groundwater, geotechnical
and rock characteristics; potential deleterious or contaminating
substances. |
· The drill holes are being cased with
either 40 or 50 millimetre PVC tubing for down-hole DHEM surveying
which is undertaken on the majority of the holes drilled.·
Geotechnical logging is undertaken on all core, 25m either side of
the massive sulphide lenses.· Archimedes method SG
measurements are determined for all sampled intervals. |
| Further work |
· The nature and scale of planned further
work (eg tests for lateral extensions or depth extensions or
large-scale step-out drilling). |
· The third phase of drilling at Woodlawn
commenced in July 2016 and was designed to test step-out
exploration targets focussing on the northern extensions to the B
Lens horizon. In addition, a number of holes were planned to
in-fill and close out shallow mineralised positions to better
define the Mineral Reserves for the early part years of the
production schedule.· The results of the program will be
assessed prior to further drilling, however, it is clear a number
of shallow targets warrant additional drilling to generate shallow
Mineral Reserves. |
For further information, please visit www.heronresources.com.au or contact:
Australia:
Mr Wayne Taylor
Managing Director and Chief Executive Officer
Tel: +61 2 9119 8111 or +61 8 6500 9200
Email: heron@heronresources.com.au
Jon Snowball, FTI Consulting
Tel: +61 2 8298 6100
jon.snowball@fticonsulting.com
Canada:
Tel: +1 647-862-1157 (Toronto)