TIDMCCZ
RNS Number : 3633S
Castillo Copper Limited
09 March 2023
09 March 2023
CASTILLO COPPER LIMITED
("Castillo", or the "Company")
Optimising Cangai Copper Mine
Castillo Copper Limited (LSE and ASX: CCZ), a base metal
explorer primarily focused on copper across Australia and Zambia,
announces that it has approved plans to update and enhance the
confidence in the 2017 inferred JORC Mineral Resource Estimate
("MRE") (Figure 1) for Cangai Copper Mine, one of Australia's
highest grading historic copper mines, following a recent site
visit by David Drakeley, his first since being appointed as
geologist and Director of Castillo.
HIGHLIGHTS:
-- Following a recent visit to Cangai Copper Mine by geologist
and director David Drakeley, the Board has approved plans to update
and enhance the confidence in the 2017 inferred JORC MRE - 107,589t
contained copper metal (3.2Mt @ 3.35%)(1)
-- Considerable drilling work post-2017, which includes 34 RC
and two HQ diamond core drill-holes for a total of 5,222m(2,3) ,
will be factored into the updated geological model - the best
intercepts from these campaigns comprised:
-- 11m @ 5.94% Cu; 2.45% Zn & 19.13g/t Ag from 40m including:
o 3m @ 8.1% Cu; 2.84% Zn & 23.42g/t Ag from 41m
o 1m @ 10.25% Cu; 1.68% Zn & 32.50g/t Ag from 48m
o 1m @ 7.53% Cu; 6.04% Zn & 30.60g/t Ag from 50m
(CC0023R)(2)
-- 5m @ 1.56% Cu, 4.43g/t Ag & 0.4% Zn from 92m including:
o 3m @ 2.22% Cu, 6.38g/t Ag & 0.60% Zn (CC004RC)(4)
-- 4.39m @ 5.06% Cu, 2.56% Zn and 20.1 g/t Ag from 49.9m (CC0036D)(3)
-- Furthermore, the model will factor in bulk sampling done on
several historic stockpiles (which should support a higher
confidence Indicated MRE), drone topographic survey and
re-positioned mine workings that are accurately geo-referenced
-- Pleasingly, Cangai Copper Mine still delivers material exploration potential as six down-hole electro-magnetic ("DHEM") surveys identified two untested off-hole bedrock conductors interpreted to be open at depth(1)
-- Once the work is complete, which is expected to take 4-8
weeks, the Board will review the findings and determine the optimal
way to further develop Cangai Copper Mine's full potential
David Drakeley, geologist and director of Castillo Copper, said:
"Cangai Copper Mine's underlying geology is impressive, but more
work is required to fully understand the system. As such, the Board
sees considerable potential to create incremental value for
shareholders by updating the 2017 MRE for subsequent drilling
campaigns and geophysical surveys. Moreover, as a standalone
project, Cangai Copper Mine still delivers significant exploration
potential with two bedrock conductors, open at depth, yet to be
drill-tested. Once the updated MRE and key geological
interpretations are complete, the Board looks forward to outlining
optimal steps to fully develop Cangai Copper Mine."
OPTIMISING CANGAI COPPER MINE
FIGURE 1: CANGAI COPPER MINE - INFERRED JORC MRE
CANGAI COPPER MINE - INFERRED RESOURCE
Mass Cu Co Zn Au Ag Cu Co Zn Au Ag
(Tonnes) (%) (%) (%) (g/t) (g/t) (Tonnes) (Tonnes) (Tonnes) (Oz) (Oz)
Oxide 814,267 4.1 0.010 0.63 0.06 27.34 33,391 78 5,165 14,550 715,667
Fresh 2,397,342 3.1 0.003 0.28 0.89 17.74 74,198 75 6,762 68,349 1,367,456
Total 3,211,609 3.35 0.005 0.37 0.8 20.17 107,589 153 11,927 82,899 2,083,123
------- ---------- ----- ------ ----- ------- ------- ---------- ---------- ---------- ------- ----------
Source: CCZ geology team (Reference 1)
The Board believes updating the MRE is likely to enhance the
confidence in the final result, especially given the following
facts:
-- Significant drilling work post-2017, which includes 34 RC and
two HQ diamond core drill-holes for a total of 5,222m(2,3) , will
now be factored into the updated geological model.
The best intercepts from these campaigns comprised:
-- 11m @ 5.94% Cu; 2.45% Zn & 19.13g/t Ag from 40m including:
o 3m @ 8.1% Cu; 2.84% Zn & 23.42g/t Ag from 41m
o 1m @ 10.25% Cu; 1.68% Zn & 32.50g/t Ag from 48m
o 1m @ 7.53% Cu; 6.04% Zn & 30.60g/t Ag from 50m
(CC0023R)(2)
-- 5m @ 1.56% Cu, 4.43g/t Ag & 0.4% Zn from 92m including:
o 3m @ 2.22% Cu, 6.38g/t Ag & 0.60% Zn (CC004RC)(4)
-- 4.39m @ 5.06% Cu, 2.56% Zn and 20.1 g/t Ag from 49.9m (CC0036D)(3)
-- In addition, the geological model will include bulk sampling
and metallurgical sampling done on several historic stockpiles
(which is likely to support a higher confidence classification
Indicated MRE), drone topographic survey and re-positioned mine
workings that are accurately geo-referenced.
Exploration upside
Cangai Copper Mine still delivers exploration potential as there
are at least two untested bedrock conductors, which are open at
depth, that were discovered during DHEM surveys across 2018-19
(Figure 2).
FIGURE 2: CANGAI COPPER MINE - CONDUCTORS & DRILL-HOLES
Source: CCZ geology team
For further information, please contact:
Castillo Copper Limited +61 8 6558 0886
Dr Dennis Jensen (Australia), Managing Director
Gerrard Hall (UK), Chairman
SI Capital Limited (Financial Adviser and Corporate
Broker) +44 (0)1483 413500
Nick Emerson
Gracechurch Group (Financial PR) +44 (0)20 4582 3500
Harry Chathli, Alexis Gore, Henry Gamble
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:
-- A large footprint 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 and platinoids.
-- 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's Statement
The information in this report that relates to Exploration
Results and Mineral Resource Estimates for "Cangai Copper Mine" is
based on information compiled or reviewed by Mr Mark Biggs. Mr
Biggs is a 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.
References
1) CCZ ASX Release - 28 September 2018 (Annual Report 2018), 3
September 2018, 19 February 2020 & 28 April 2020
2) CCZ ASX Release - 3 September 2018
3) CCZ ASX Release - 11 December 2018
4) CCZ ASX Release - 3 March 2018
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