Ann: CZ Copper Drilling Update Positive Progress, page-2

ASX Announcement
30 September 2021
Corporate Office
78 Churchill Avenue
Subiaco WA 6008
www.helixresources.com.au
T +61 8 9321 2644
E [email protected]
CZ Copper Drilling Update – Positive Progress
• 2,000 metres of Reverse Circulation (RC) and diamond core drilling completed at CZ Project in the
current program
• 1,400 metres of diamond core drilling in 7 holes in progress to complete the current program
• Visible copper mineralisation indicating potential extensions to shallow oxide copper portion of the CZ
Mineral Resource1 observed in four drill holes (refer Figure 1) – assays pending
• Diamond drilling to test for extensions of the copper-sulphide (fresh) resource underway
• Large diameter core drilling for metallurgical samples successfully intersected significant intervals of
visible copper mineralisation
Figure 1 - Copper oxide mineralisation; azurite (blue) and malachite (green) in CORC0140 at 34 metres
1 Refer Appendix 1 for details
Page 2
Helix Resources Limited (ASX: HLX) (“Helix” or “the Company”) is pleased to provide an update on the Company’s
copper exploration activities on its wholly owned tenements along the Collerina Copper trend, located in the
prolific copper-endowed Cobar region of NSW (refer Figure 6 Location Plan).
The objectives of the drilling in and around the CZ Mineral Resource2
are:
• Recover large volumes of metallurgical samples representing oxide, transitional and fresh copper
mineralisation styles;
• Test for potential extensions of shallow copper oxide mineralisation; and
• Test for extensions to the deeper, fresh copper sulphide mineralisation.
Under challenging circumstances due to COVID-19 restrictions and replacement of several long-term exploration
personnel, Helix has drilled eighteen holes in the current program, for a total of nearly 2,000 metres as outlined
below and presented in Figure 2, ‘Drill Hole Location Plan’. Diamond core drilling of approximately 1,400 metres
has started today.
• Metallurgical sample drilling – completed four diamond core holes for 663.3 metres with significant oxide
and fresh copper mineralisation intersected at the planned intervals.
• CZ Resource, shallow extension drilling - testing for oxide mineralisation extensions has been completed
with seven RC holes completed for 599 metres. The copper oxide drilling has been successful with new
zones of up to 21 metres of visible copper mineralisation intersected in four of the seven holes. The holes
were testing for potential extensions to the current oxide Mineral Resource2
(refer Figure 1).
• CZ Resource, deeper extension drilling - to be undertaken with combined RC pre-collars and diamond core
tails. To date seven RC pre collars were completed for 721 metres and diamond core tails on the precollars of approximately 1,400 metres drilling commenced today.
In a technical sense, the drilling rig is ‘aimed at what the geologists can see’ and not focused on historical,
interpreted geological models. This ‘back to fundamentals’ approach is necessary as Helix geologists are
continuing to assess gaps in the database with no geological or assay data from various historical holes as per the
example presented in Figure 3. Whilst time consuming, this creates positive opportunities to significantly refine
the geological model to optimise and enhance the exploration outlook at both the CZ Deposit2
and also for the
new prospects along the Collerina Trend.
Commenting on the ongoing activities, Helix Managing Director Mike Rosenstreich said:
“Early geological observations are very promising for increasing the resources at CZ and, in tandem with that, to
have metallurgical samples to set us on a development pathway.
While the Helix exploration team have all recently been appointed to their positions, it is important to note they
are now all strategically based in close proximity to operations in regional NSW and all highly experienced in the
local geology. I applaud their energy and inquisitive work ethic to revisit all aspects of the previous geological
models and focus on the new drilling underway as well as plugging gaps from the earlier drill data base – which I
think will contribute to some very exciting discovery opportunities.
We believe there is a lot of prospectivity along this Collerina Copper Trend where we are adding to our ground
position and initiating work to assess new regional targets in a systematic technically focussed approach – to find
more copper.”
2 Refer Appendix 1 for details.
Page 3
Figure 2: CZ Deposit Drill Hole Location Plana
Figure 3: CZ Deposit Schematic ‘Cross-Section’b
Note a & b: Information relevant to pre-2021 drill intercepts can be found in ASX releases dated; 11 June 2019, Interim Maiden Resource at
Collerina Copper Project, 25 November 2020, Collerina copper drilling recommences, 21 January 2021, Copper Exploration Update and 15
February 2021, NSW Projects Exploration Update.
Page 4
TECHNICAL REPORT
Drilling is currently in progress at the CZ Deposit3
, on the Collerina Trend. The current CZ drilling program
comprises diamond core to provide samples for metallurgical test work and a mixture of RC and diamond core for
copper resource extension and definition.
Metallurgical Drilling
Four large diameter (PQ) diamond holes (CODD0132 to CODD0135) for metallurgical test work were drilled for
663.3 metres. The holes were designed to target oxide, transition and sulphide copper mineralisation. One hole
(CODD0134) was extended with HQ core to test a modelled Fixed Loop EM (FLEM) conductor plate at depth;
however, no significant sulphide was intersected. Logging of these holes has been completed and core cutting is
in progress. The core will be submitted to the laboratory for assay and metallurgical test work next week. Initial
assay results are expected in early November.
The metallurgical test work holes intersected a hanging wall succession of mica (phlogopite) schist and chlorite
schist with irregular anastomosing quartz veins and faults. The depth of weathering ranges from 27 to 58 metres
downhole (14 to 29 metres vertically). Oxide mineralisation comprises purple and dark brown hematite rich
gossan with trace chalcocite and copper hydroxide (malachite and azurite), and locally native copper. Sulphide
mineralisation comprises massive stratiform fine-grained pyrite (FeS2) with chalcopyrite (CuFeS2) ± sphalerite
(ZnS) in laminae or agglomeration.
The footwall succession comprises chlorite-quartz schist (locally laminated) and ultramafic rocks with sheared
margins. The ultramafic layer is generally between 40 and 50 metres below the massive sulphide mineralisation,
apart from CODD0132 where it occurs in faulted contact with oxide mineralisation. In general, stratigraphy is
northwest-southeast trending with variable dips to the northeast of 350
to 450
.
Each of the four holes intersected copper mineralisation, as summarised below.
• CODD0132 intersected 10 metres of copper oxide mineralisation from 32 metres down hole.
• CODD0133 intersected 18 metres of copper oxide mineralisation from 39 metres down hole.
• CODD0134 intersected two massive sulphide intervals, with an upper interval 3.3 metres from 84.7
metres down hole, and a lower 3.2 metre interval from 102.3 metres down hole.
• CODD0135 intersected a 2.4 metre massive sulphide interval from 156.6 metres down hole.
Further details for the mineralised copper intervals are provided in Table 1 and representative core photographs
are presented in Figures 4 to 6.
Figure 4 – CANDD0133 52m to 54.7m showing purple-red gossan from 53.3m
3 Refer Appendix 1 for details.
Page 5
Table 1: Copper mineralisation in metallurgical sample holes, CODD0132 to CODD0135
Hole ID Total
Depth Target Copper
Observed Description
CODD0132 105.7m Low-grade oxide
mineralisation 32m to 42m
Weathered mica-schist with low-intensity copper
oxide mineralisation containing trace of chalcocite
and copper hydroxides (malachite and azurite)
CODD0133 100.3m
Moderate to lowgrade oxide
mineralisation
39m to 57m
Weathered mica-schist with moderate-intensity
oxide mineralisation with three horizons of gossan
containing chalcocite, copper hydroxides and native
copper
CODD0134 259.9m
High-grade sulphide
mineralisation
84.7m to
88m
Massive fine stratiform pyrite, with deformed/folded
chalcopyrite
102.3m to
105.5m Massive fine stratiform pyrite with chalcopyrite
FLEM conductor plate
below 150m
downhole
None
Five metres of ultramafic, strongly sheared on
margins (quartz-calcite breccia, puggy clay and
disseminated pyrite – possibly FLEM conductor plate)
CODD0135 197.4m High-grade sulphide
mineralisation
156.8m to
159.2m
Massive fine stratiform pyrite with chalcopyrite
layers and trace of sphalerite
Figure 5 – CANDD0134 101.5m to 106.2m showing massive sulphide from 102.3m to 105.5m comprising
stratiform fine-grained pyrite and chalcopyrite
Page 6
Resource Extension Drilling
RC drilling was recently completed testing for extensions of the existing oxide copper Mineral Resource4
, as well
as providing pre-collars for diamond core drilling to test extensions of primary sulphide copper resources at
depth.
Ten RC holes (CORC0136 to CORC0144) for 929 metres have been completed in the current program, three of
which are pre-collars that will be extended with diamond core tails. Logging and sampling the last hole,
CORC0145, is in progress.
The RC holes tested up dip and along strike from existing primary, transition, and copper oxide mineralisation
(refer representative cross section in Figure 3). The dominant host rock is highly weathered and deformed mica
schist containing quartz veins and quartz breccia. Copper oxide mineralisation is associated with quartz-rich zones
and distinct narrow gossan lenses. Secondary copper occurs in quartz-rich zones containing copper hydroxide
minerals (malachite and azurite), in variable intervals of up to 21 metres down hole (Figures 1, 7 and 8). A
summary of the visual results for the oxide holes is provided in Table 2.
Table 2: Shallow copper oxide mineralisation in CODD0139 to CODD0144
Hole ID Total
Depth (m)
Copper
Observed
Interval
(m) Description
CORC0139 72 31m to 39m 8
Box work after sulphide, gossan and quartz with
manganese staining and copper hydroxides
(malachite).
CORC0140 66 27m to 47m 20 Iron oxide, variable copper hydroxides (malachite
and azurite) and quartz.
CORC0141 78 32m to 53m 21 Gossan, variable copper hydroxides (malachite and
azurite) and box work after sulphide.
CORC0142 90 None Weathered and fresh schist.
CORC0143 58 (abd.) None Weathered schist. Hole terminated due to water.
CORC0144 90 38m to 39m 1 Copper hydroxide (malachite) and quartz.
CORC0145 144 TBA NA Logging in progress.
The copper oxide drilling has been successful with new zones of copper mineralisation intersected in four of the
five holes to successfully test the targeted oxide Mineral Resource4 extensions. It is anticipated that the copper
oxide Mineral Resource at CZ4 will increase after assay results are received and processed. Collar details for the
drill holes completed to date are provided in Table 3.
The remainder of the drilling program will target deeper primary mineralisation with diamond tails to RC precollars. Approximately 1,400 metres of diamond core drilling remains to be completed in 7 diamond tails to the
pre-collared holes. An additional two holes are available in the approved 20-drill hole program, and these holes
(likely pre-collared diamond holes) will be designed after further review of ongoing results. The first batch of
samples from the RC drilling program have been submitted to the laboratory, with results anticipated in late
October 2021.
4 Refer Appendix 1 for details.
Page 7
Figure 6 – CANDD0135 155.3m to 160.3m showing massive sulphide from 156.8m to 159.2m comprising fine
stratiform pyrite with chalcopyrite layers and trace sphalerite.
Table 3: Drill Hole Details (MGA94 Zone 55)
Hole ID Drill
Type Target Easting
(mE)
Northing
(mN)
Start
Dip Azimuth RL Total
Depth
CODD0132 DD Metallurgy 505186 6455010 -60 215 204 105.7
CODD0133 DD Metallurgy 505359 6454963 -60 215 212 100.3
CODD0134 DD Metallurgy 505414 6455007 -60 215 212 259.9
CODD0135 DD Metallurgy 505594 6454964 -70 260 211 197.4
CORC0136 RCDD Pre-collar 505570 6455028 -60 215 203 90
CORC0137 RCDD Pre-collar 505621 6455107 -60 215 208 144
CORC0138 RCDD Pre-collar 505258 6455102 -60 215 205 97
CORC0139 RC Oxide 505517 6454840 -60 215 216 72
CORC0140 RC Oxide 505474 6454857 -60 215 217 66
CORC0141 RC Oxide 505449 6454886 -60 215 217 78
CORC0142 RC Oxide 505450 6454923 -60 215 214 90
CORC0143 RC Oxide 505071 6455163 -60 215 199 58
CORC0144 RC Oxide 505129 6455137 -60 215 203 90
Page 8
Figure 7 – Copper oxide mineralisation; malachite and quartz in CORC0139 at 35 metres.
Figure 8 – Copper oxide mineralisation. A: malachite, azurite and quartz in CORC0141 at 38m. B: malachite and
quartz in CORC0144 at 39m.
A
B
Page 9
Regional Copper Exploration
As reported previously, approval has been received for regional exploratory auger drilling comprising
approximately 1,000 shallow holes in the northern section of the Collerina Trend within EL74385
. This work is
expected to commence in November subject to finalising an appropriate drilling contractor.
The program is designed to follow-up on several high-priority VTEM targets identified in March 2021 in the
Hermidale/Qanda prospect area at the north of the tenement. As well, the Company filed an application for
additional exploration licence (ELA6339) to ensure coverage of high-priority VTEM targets identified in the south
of the Collerina Trend, on the western boundary of the existing tenement, near Five Ways. Surface EM surveys
are also planned for these prospects as soon as cropping activity is complete. Details are provided in Figure 6 –
which has been updated and corrected to the version presented previously4
.
Figure 6: Location Plan of approved auger drilling.
5 Refer to HLX ASX report dated 23 September 2021
Page 10
COMPETENT PERSON STATEMENT
The information in this report that relates to exploration results, Mineral Resource estimates and geological data
for the Cobar projects is based on information generated and compiled by Mr Gordon Barnes and Mr Mike
Rosenstreich who are both employees and shareholders of the Company. Mr Barnes is a Member, of the
Australian Institute of Geoscientists and Mr Rosenstreich is a Fellow of the Australasian Institute of Mining and
Metallurgy. They both have sufficient experience that is relevant to the styles of mineralisation and types of
deposits under consideration and to the activities being undertaken to each qualify as Competent Person(s) as
defined in the 2012 Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and
Ore Reserves”. Mr Barnes and Mr Rosenstreich have consented to the inclusion of this information in the form
and context in which it appears in this report.
This ASX release was authorised by the Board of Directors of Helix Resources Ltd.
ABN: 27 009 138 738
ASX: HLX
Contact Details:
Helix Resources Limited
78 Churchill Avenue,
SUBIACO, WA, 6008
PO Box 825
West Perth, WA, 6872
Email: [email protected]
Web: www.helixresources.com.au
Tel: +61 (0)8 9321 2644
Board of Directors:
Peter Lester Non-Executive Chairman
Tim Kennedy Non-Executive Director
Jason Macdonald Non-Executive Director
Mike Rosenstreich Managing Director
Company Secretary