REG - Greatland Gold PLC - Havieron Exploration and Development Update
28/04/2022 07:45
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RNS Number : 6748J Greatland Gold PLC 28 April 2022
28 April 2022
THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION AS STIPULATED UNDER THE UK
MARKET ABUSE REGULATIONS. ON PUBLICATION OF THIS ANNOUNCEMENT VIA A
REGULATORY INFORMATION SERVICE, THIS INFORMATION IS CONSIDERED TO BE IN THE
PUBLIC DOMAIN.
Greatland Gold plc
("Greatland" or "the Company")
Havieron Exploration and Development Update
Growth drilling programme continues to expand the Havieron footprint
with high grade mineralised extensions in all tested target zones
New high-grade mineralised intercept to the east of the Eastern Breccia
Mineral Resource reinforces its potential to host Crescent style high grade
mineralisation
High grade results in the Northern Breccia demonstrate the potential for
further high-grade sulphide mineralisation outside the South East Crescent
Zone
Greatland Gold plc (AIM:GGP), a mining development and exploration company
with a focus on precious and base metals, is pleased to provide an exploration
and development update at the Havieron gold-copper project in the Paterson
region of Western Australia. The Company notes the release of an ASX
announcements titled "Quarterly Exploration Report" and "Quarterly Report" by
Newcrest Mining Ltd ("Newcrest") earlier today included results previously
released in Greatland's announcement of 10 March 2022 along with the following
new results.
Highlights
§ Seven drill rigs currently operational, all focused on growth targeting:
§ Eastern Breccia: defining the mineralised footprint and extensions of the
Eastern Breccia including definition of higher-grade zones identified in
HAD104^^ and the new intersection in HAD145W1
§ South East Crescent: targeting extensions to the South East Crescent below
the Updated Mineral Resource(1) in addition to lateral extensions adjacent to
the existing high-grade Updated Mineral Resource
§ Northern Breccia: expansion of high-grade mineralised zones within the
Northern Breccia
§ North West Pod: expansion of high-grade mineralised zones within the North
West Pod
§ New Targets: drilling is continuing to target geophysical targets outside
of the main Havieron system
New drilling results
§ Drilling into the Eastern Breccia returned an intercept approximately 100m
to the north of previously reported high grade mineralisation (HAD104), and
100m east of the Eastern Breccia Resource outlined in the Updated Mineral
Resource. This hole reinforces the potential for the north west trending
Eastern Breccia corridor to host Crescent style high grade mineralisation:
§ HAD145AW1 returned 150.1m @ 3.7g/t Au & 0.15% Cu or 3.95g/t
AuEq(2) from 1,827.9m
§ Including 42.3m @ 8.6g/t Au & 0.4% Cu or 9.26g/t AuEq(2) from
1,854m
§ High grade results in the Northern Breccia reinforce the potential for
further high-grade sulphide mineralisation outside the SE Crescent Zone:
§ HAD085W6 intersected 52m @ 3.0g/t Au & 0.09% Cu or 3.14g/t AuEq(2) from
1,327m
§ Including 17.9m @ 7.7g/t Au & 0.07% Cu or 7.8g/t AuEq(2) from 1,361.1m
within the footprint of the Updated Mineral Resource
§ Early Works advancing: Construction activities by Newcrest are progressing
including:
§ Exploration decline has advanced 313 metres as at 20 April 2022
§ Drilling of the blind bore ventilation shaft is now complete, and liners
have been installed to design depth. This milestone successfully marks a
significant reduction in risk to construction
Newcrest has advised the development of the exploration decline experienced
poor ground conditions in the March 2022 quarter. Advance rates were
significantly impacted by unfavourable geotechnical and hydrogeological
conditions requiring extensive local and surface dewatering, pre-excavation
ground treatment and substantial ground support installation. Changes in the
design of the decline have brought forward the first downward spiral to the
current chainage which will allow the decline to transition into better ground
conditions sooner. As a result of this change, development rates are expected
to improve in the June 2022 quarter. Newcrest advise that first ore is now
expected in the second half of FY24.
Drilling of the blind bore ventilation shaft is now complete and liners have
been installed to design depth. This milestone successfully marks a
significant reduction in risk to construction.
Newcrest is reviewing the overall project performance and schedule including
any impact of inflationary pressures as part of the Feasibility Study.
§ Feasibility Study work by Newcrest is progressing and key contracts have
been awarded. The Feasibility Study is still forecasted to be delivered in the
December 2022 quarter(3).
Shaun Day, Managing Director of Greatland Gold plc, commented: "The early
results from the 2022 growth drilling programme are tremendous with high grade
mineralised extensions identified across all tested target zones.
Whilst growth drilling at the Eastern Breccia continues to define the
mineralised footprint and extensions of the Breccia, a new high grade
intercept has reinforced the potential for the Eastern Breccia corridor to
host Crescent style high grade mineralisation. This demonstrates the ongoing
potential for the expansion of the Havieron footprint below and adjacent to
the existing mineralisation.
With ongoing drilling focusing on growth there is substantial potential to
further demonstrate the depths and extents of the high-grade mineralisation,
that remain open along strike and at depth at Havieron."
(1) Refers to Greatland's Updated Mineral Resource as announced on 3(rd)
March 2022
(2) The gold equivalent (AuEq) is based on assumed prices of US$1,450/oz Au
and US$3.23/lb Cu for Ore Reserve and assumed prices of US$1,600/oz Au and
US$3.50/lb Cu for Mineral Resource and metallurgical recoveries based on block
metal grade, reporting approximately at 88% for Au and 84% for Cu which in
both cases equates to a formula of approximately AuEq = Au (g/t) + 1.5 * Cu
(%). It is the company's opinion that all the elements included in the metal
equivalents calculation have a reasonable potential to be recovered and sold
(3 )Newcrest market update to Australian Stock Exchange on 12(th) October
2021
Significant New Results (intercepts are reported as downhole width not true
width)
Eastern Breccia
§ HAD093A
§ 76.7m @ 1.9g/t Au & 0.07% Cu from 1,306.1m
§ including 18.2m @ 3.7g/t Au & 0.17% Cu from 1,347.8m
§ HAD145AW1
§ 59.2m @ 0.91g/t Au & 0.14% Cu from 1,633m
§ 32.9m @ 1.5g/t Au & 0.63% Cu from 1,730.4m
§ 150.1m @ 3.7g/t Au & 0.15% Cu from 1,827.9m
§ including 42.3m @ 8.6g/t Au & 0.4% Cu from 1,854m
§ HAD152
§ 63m @ 0.98g/t Au & 0.13% Cu from 1,767m
South East Crescent
§ HAD133W6^
§ 173.2m @ 1.9g/t Au & 0.18% Cu from 1,424.6m
§ including 43.1m @ 3.7g/t Au & 0.34% Cu from 1,425.9m
Northern Breccia
§ HAD085W6
§ 64.4m @ 2.1g/t Au & 0.06% Cu from 1,174.3m
§ including 23.7m @ 5.3g/t Au & 0.1% Cu from 1,199.6m
§ 52m @ 3.0g/t Au & 0.09% Cu from 1,327m
§ including 17.9m @ 7.7g/t Au & 0.07% Cu from 1,361.1m
§ HAD093A
§ 273.6m @ 1.1g/t Au & 0.14% Cu from 886.6m
In addition to this release, a PDF version of this report with supplementary
information can be found at the Company's website:
https://greatlandgold.com/investors/regulatory-news/
(https://greatlandgold.com/investors/regulatory-news/)
Enquiries:
Greatland Gold PLC +44 (0)20 3709 4900
Shaun Day info@greatlandgold.com
www.greatlandgold.com
SPARK Advisory Partners Limited (Nominated Adviser) +44 (0)20 3368 3550
Andrew Emmott/James Keeshan
Berenberg (Joint Corporate Broker and Financial Adviser) +44 (0)20 3207 7800
Matthew Armitt/Jennifer Lee/Detlir Elezi
Canaccord Genuity (Joint Corporate Broker and Financial Adviser) +44 (0)20 7523 8000
James Asensio/Patrick Dolaghan
Hannam & Partners (Joint Corporate Broker and Financial Adviser) +44 (0)20 7907 8500
Andrew Chubb/Matt Hasson/Jay Ashfield
SI Capital Limited (Joint Broker) +44 (0)14 8341 3500
Nick Emerson/Alan Gunn
Luther Pendragon (Media and Investor Relations) +44 (0)20 7618 9100
Harry Chathli/Alexis Gore
Further Information on Drilling and Operations at Havieron
The Havieron copper-gold deposit is centered on a deep magnetic anomaly
located 45km east of Telfer in the Paterson Province where exploration
drilling by Greatland during 2018 resulted in the discovery of gold and copper
mineralisation under 420m of post mineralisation cover. The Joint Venture
commenced drilling during the June 2019 quarter and has completed 237,444m of
drilling from 285 drill holes to date (excluding holes in progress, abandoned
holes, or drill holes which have not been sampled).
Drilling activities have produced a further 4,475m of drilling from 6 new
holes since the last update ("Havieron Growth Drilling Update", RNS dated 10
March 2022). New assay results are reported from 6 holes, and additional
results are reported for 1 hole for which partial results were reported last
period. 6 holes returned significant assay intercepts in excess of 50 gram
metres Au (Au ppm x length metres).
Growth drilling is focused on potential resource growth at the South East
Crescent Zone, Northern Breccia, Eastern Breccia and regional exploration
holes outside the main Havieron mineralised system. Assays reported include
drilling from:
§ South East Crescent Deeps - assay results reported for four drill holes,
with two holes awaiting assays.
§ Northern Breccia - assay results are reported for two drill holes testing
the Northern Breccia.
§ Eastern Breccia - assay results reported for three drill holes, with two
holes awaiting assays.
§ First pass drill testing of geophysical targets outboard of the Havieron
system, two drill holes pending from step out drilling north and south of the
Havieron system.
There are now seven rigs on site operating two shifts, and the number of drill
holes completed is expected to increase in further updates. The JV is
targeting a further 40,000m of growth drilling in the year to 30 June 2022
which has the potential to further expand the Havieron resource.
Refer to Appendix 2 for all reported results.
At the Eastern Breccia, assays for an additional three holes targeting strike
extensions from previously reported drill holes have been received. As
reported in the previous updates, HAD104^^ returned 62.5m @ 5.9g/t Au &
0.30% Cu from 1,546.5m, including 49.4m @ 7.1g/t Au & 0.38% Cu from
1,554.6m, approximately 200m to the southwest of previous drilling. New
results from HAD145W1 testing approximately 100m to the north of HAD104 and
100m to the east of the Updated Mineral Resource for the Eastern Breccia has
returned 150.1m @ 3.7g/t Au & 0.15% Cu from 1,827.9m, including 42.3m @
8.6g/t Au & 0.4% Cu from 1,854m.
HAD104(^^) and HAD145W1 represent the most significant intercepts in the
Eastern Breccia zone to date and confirm the potential for this separate
northwest trending corridor to host Crescent style high grade mineralisation.
Drilling is now focused on defining the extents of this higher-grade
mineralisation which remains open to the south east, and vertically above and
below the two high grade drill holes.
Results include:
§ HAD093A
§ 76.7m @ 1.9g/t Au & 0.07% Cu from 1,306.1m
§ including 18.2m @ 3.7g/t Au & 0.17% Cu from 1,347.8m
§ HAD145AW1
§ 59.2m @ 0.91g/t Au & 0.14% Cu from 1,633m
§ 32.9m @ 1.5g/t Au & 0.63% Cu from 1,730.4m
§ 150.1m @ 3.7g/t Au & 0.15% Cu from 1,827.9m
§ including 42.3m @ 8.6g/t Au & 0.4% Cu from 1,854m
§ HAD152
§ 63m @ 0.98g/t Au & 0.13% Cu from 1,767m
South East Crescent Deeps growth drilling continued during the reporting
period targeting higher grade mineralisation at depth below the Updated
Mineral Resource. Results were received from three drill holes, and updated
results from one drill hole HAD133W6(^), which is now reported in full.
Results from HAD133W7 and HAD133W8 are approximately 50m below the Updated
Mineral Resource and outside of what is interpreted to be the thicker steeply
southeast plunging core of the high grade Crescent Zone. The best
mineralisation to date is developed next to the dolerite dyke in HAD133W6(^)
(173.2m @ 1.9g/t Au & 0.18 % Cu from 1,424.6 m, including 43.1m @ 3.7g/t
Au & 0.34% Cu from 1,425.9m) which remains the deepest high-grade SE
Crescent mineralised intercept to date, at the base of the updated Mineral
Resource. Further drilling is planned to test potential for high-grade
resource extensions.
Results include:
§ HAD085W7
§ 35.7m @ 2.3g/t Au & 0.04% Cu from 1,534m
§ HAD133W6^
§ 173.2m @ 1.9g/t Au & 0.18% Cu from 1,424.6m
§ including 43.1m @ 3.7g/t Au & 0.34% Cu from 1,425.9m
§ HAD133W8
§ 41.6m @ 0.82g/t Au & 0.07% Cu from 1,471.9m
§ including 13m @ 1.4g/t Au & 0.14% Cu from 1,474m
Northern Breccia infill drilling has targeted known high-grade mineralisation
within the core of the Northern Breccia. Drilling has intercept both higher
grade Crescent style mineralisation (HAD085W6) along with broad zones of lower
grade Northern Breccia mineralisation (HAD093A).
Results include:
§ HAD085W6
§ 64.4m @ 2.1g/t Au & 0.06% Cu from 1,174.3m
§ including 23.7m @ 5.3g/t Au & 0.1% Cu from 1,199.6m
§ 52m @ 3.0g/t Au & 0.09% Cu from 1,327m
§ including 17.9m @ 7.7g/t Au & 0.07% Cu from 1,361.1m
§ HAD093A
§ 273.6m @ 1.1g/t Au & 0.14% Cu from 886.6m
Drilling to test geophysical targets outside of the known Havieron system,
including evaluating the Havieron dolerite at multiple intervals north and
south of the Havieron mineralised pipe has been undertaken. HAD154 and HAD155
tested the Havieron dolerite 400m north and south of Havieron respectively,
with results pending.
The JV is targeting a further 40,000m of growth drilling in the year to 30
June 2022 which has the potential to further expand the Havieron resource.
Growth drilling continues to show potential for resource additions outside of
the existing Inferred Mineral Resource limits, including:
§ Extension of the South East Crescent Zone at depth below the Updated
Mineral Resource;
§ Potential for additional material in the Eastern Breccia, including higher
grade "Crescent" like material, currently open along strike and at depth; and
§ Expansion of multiple higher-grade zones including Northern Breccia and
North West Pod;
§ Additionally, drilling is continuing to target geophysical targets outside
of the main Havieron system.
Refer to Appendix 1 for additional information and Appendix 2 for all
drillhole results reported during the period.
Development Update
Newcrest has advised the development of the exploration decline experienced
poor ground conditions in the March 2022 quarter. Advance rates were
significantly impacted by unfavourable geotechnical and hydrogeological
conditions requiring extensive local and surface dewatering, pre-excavation
ground treatment and substantial ground support installation. Changes in the
design of the decline have brought forward the first downward spiral to the
current chainage which will allow the decline to transition into better ground
conditions sooner. As a result of this change, development rates are expected
to improve in the June 2022 quarter. Newcrest advise that first ore is now
expected in the second half of FY24.
Work is ongoing to understand the impact on the overall project schedule, as
well as assessing options to recover some of these delays and minimise the
associated cost increases.
Newcrest is reviewing the overall project performance and schedule including
any impact of inflationary pressures as part of the Feasibility Study.
Drilling of the blind bore ventilation shaft is now complete and liners have
been installed to design depth. This milestone successfully marks a
significant reduction in risk to construction.
Background to Havieron and Joint Venture Agreement with Newcrest
The Havieron copper-gold project is operated by Newcrest under a Joint Venture
Agreement with Greatland. Newcrest is entitled (subject to the terms of the
Joint Venture Agreement) to a joint venture interest of 70% (30%
Greatland). Newcrest may also acquire an additional 5% joint venture
interest at fair market value (under the principles of the Joint Venture
Agreement) and, if exercised, Newcrest will be entitled to an overall joint
venture interest of 75% (Greatland 25%). Greatland and Newcrest continued to
progress the process to determine the option price for the 5% interest in
accordance with the Joint Venture Agreement during the period.
The Joint Venture Agreement includes tolling principles reflecting the
intention of the parties that, subject to a successful exploration programme
and feasibility study and a positive decision to mine, the resulting joint
venture mineralised material will be processed at Telfer, located 45km west of
Havieron.
A regional map showing the Havieron licence area with regional targets and
adjacent landholdings can be found at: www.greatlandgold.com/paterson
(https://greatlandgold.com/paterson/)
A version of this release with the full images and diagrams can be found on
the Company's website: https://greatlandgold.com/investors/regulatory-news/
(https://greatlandgold.com/investors/regulatory-news/)
Competent Person:
Information in this announcement that relates to exploration results has been
extracted from the following announcements:
"Quarterly Exploration Report", dated 28 April 2022 (Newcrest)
"Havieron Growth Drilling Update", dated 10 March 2022 (Greatland)
"Havieron Resource and Reserves Update", dated 3 March 2022 (Greatland)
"Havieron Exploration Update", dated 28 January 2022 (Greatland)
"Quarterly Exploration Report", dated 28 January 2022 (Newcrest)
"Havieron Exploration and Development Update", dated 9 December 2021
(Greatland)
"Exploration Update", dated 9 December 2021 (Newcrest)
"Havieron Exploration and Development Update", dated 28 October 2021
(Greatland)
"Quarterly Exploration Report", dated 28 October 2021 (Newcrest)
"Havieron Development and Exploration Update" dated 9 September 2021
(Greatland)
"Exploration Update", dated 9 September 2021 (Newcrest)
"Havieron Development and Exploration Update" dated 22 July 2021 (Greatland)
"Quarterly Exploration Report", dated 22 July 2021 (Newcrest)
"Further Excellent Growth Drilling Results at Havieron", dated 10 June 2021
(Greatland)
"Exploration Update", dated 10 June 2021 (Newcrest)
"Excellent Growth Drilling Results at Havieron", dated 29 April 2021
(Greatland)
"Quarterly Exploration Report", dated 29 April 2021 (Newcrest)
"Further Outstanding Infill Drilling Results at Havieron", dated 11 March 2021
(Greatland)
"Exploration Update", dated 11 March 2021 (Newcrest)
"Newcrest Reports Further Drilling Results at Havieron", dated 28 January 2021
(Greatland)
"Quarterly Exploration Report", dated 28 January 2021 (Newcrest)
"Newcrest Reports Further Drilling Results at Havieron", dated 10 December
2020 (Greatland)
"Exploration Update", dated 10 December 2020 (Newcrest)
"Initial Inferred Mineral Resource Estimate for Havieron", dated 10 December
2020 (Greatland)
"Initial Inferred Mineral Resource Estimate for Havieron", dated 10 December
2020 (Newcrest)
"Drilling Results at Havieron Highlight Potential New Eastern Breccia Target",
dated 29 October 2020 (Greatland)
"Quarterly Exploration Report", dated 29 October 2020 (Newcrest)
"Latest Drilling Results at Havieron Highlight Potential Bulk Tonnage Target",
dated 10 September 2020 (Greatland)
"Exploration Update", dated 10 September 2020 (Newcrest)
"Newcrest Identifies New Zone of Breccia Mineralisation at Havieron", dated 23
July 2020 (Greatland)
"Quarterly Exploration Report", dated 23 July 2020 (Newcrest)
"Further Outstanding Drill Results from Havieron", dated 11 June 2020
(Greatland)
"Exploration Update", dated 11 June 2020 (Newcrest)
"Newcrest Reports Further Outstanding Drill Results at Havieron", dated 30
April 2020 (Greatland)
"Quarterly Exploration Report", dated 30 April 2020 (Newcrest)
"Newcrest Reports Further Outstanding Drill Results at Havieron", dated 11
March 2020 (Greatland)
"Exploration and Guidance Update", dated 11 March 2020 (Newcrest)
"Further Outstanding Drill Results at Havieron", dated 30 January 2020
(Greatland)
"Quarterly Exploration Report", dated 30 January 2020 (Newcrest)
"New Outstanding Drill Results at Havieron Extend the Strike Length of
High-Grade Mineralisation", dated 2 December 2019 (Greatland)
"Exploration Update - Havieron", dated 2 December 2019 (Newcrest)
"Further High-Grade Drilling Results from Newcrest's Campaign at Havieron",
dated 24 October 2019 (Greatland)
"Quarterly Exploration Report - September 2019", dated 24 October 2019
(Newcrest)
"Update on Newcrest Drilling Results at Havieron", dated 10 September 2019
(Greatland)
"Exploration Update - Havieron", dated 10 September 2019 (Newcrest)
"First Results from Newcrest's Drilling Campaign at Havieron", dated 25 July
2019 (Greatland)
"Newcrest Quarterly Exploration Report - June 2019", dated 25 July 2019
(Newcrest)
Information in this announcement has been reviewed and approved by Mr John
McIntyre, a Member of the Australian Institute of Geoscientists (MAIG), who
has more than 30 years relevant industry experience. Mr McIntyre is an
employee of the Company and has a financial interest in Greatland Gold
plc. Mr McIntyre has sufficient experience 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 by the
2012 Edition of the Australasian Code for Reporting of Exploration Results,
Mineral Resources and Ore Reserves (the JORC Code) and under the AIM Rules -
Note for Mining and Oil & Gas Companies, which outline standards of
disclosure for mineral projects. Mr McIntyre consents to the inclusion in
this announcement of the matters based on this information in the form and
context in which it appears. Mr McIntyre confirms that the Company is not
aware of any new information or data that materially affects the information
included in the relevant market announcements, and that the form and context
in which the information has been presented has not been materially modified.
Additional information on the project can be found on the Company's website at
https://greatlandgold.com/projects/havieron/
(https://greatlandgold.com/projects/havieron/)
In addition to this release, a PDF version of this report with supplementary
information can be found at the Company's website:
www.greatlandgold.com/media/jorc (https://greatlandgold.com/media/jorc/)
Notes for Editors:
Greatland Gold plc (AIM:GGP) is a mining development and exploration company
with a focus on precious and base metals. The Company's flagship asset is the
world-class Havieron gold-copper deposit in the Paterson region of Western
Australia, discovered by Greatland and presently under development in Joint
Venture with Newcrest Mining Ltd.
Havieron is located approximately 45km east of Newcrest's Telfer gold mine
and, subject to positive decision to mine, will leverage the existing
infrastructure and processing plant to significantly reduce the project's
capital expenditure and carbon impact for a low-cost pathway to development.
An extensive growth drilling programme is presently underway at Havieron with
a maiden Pre-Feasibility Study released on the South-East Crescent on 12
October 2021. Construction of the box cut and decline to develop the Havieron
deposit commenced in February 2021.
Greatland has a proven track record of discovery and exploration success. It
is pursuing the next generation of tier-one mineral deposits by applying
advanced exploration techniques in under-explored regions. The Company is
focused on safe, low-risk jurisdictions and is strategically positioned in the
highly prospective Paterson region. Greatland has a total six projects across
Australia with a focus on becoming a multi-commodity mining company of
significant scale.
APPENDIX I
Havieron Project (Greatland Gold plc - Newcrest Joint Venture ): JORC Table 1
Section 1 Sampling Techniques and Data
Criteria Commentary
Sampling techniques Samples are obtained from diamond core drilling in Proterozoic basement
lithologies.
Core is cut along the orientation line and one half consistently sampled.
PQ-HQ and NQ diameter core was drilled on a 6m run. Core was cut using an
automated core-cutter and half core sampled at 1m intervals or at breaks for
major geological changes. Sampling intervals range from 0.2 - 2.0m. Sample
weights were typically between 0.7 and 5.6 kg. Cover sequences were not
sampled.
Drilling techniques Permian Paterson Formation cover sequence was drilled using mud rotary
drilling. Depths of cover typically observed to approximately 420m vertically
below surface. Steel casing was emplaced to secure the pre-collar.
Core drilling was advanced from the base of the cover sequence with PQ3, HQ3
and NQ2 diameter double tube coring configuration with minor HQ and PQ triple
tube configuration. Navi drilling was undertaken to start wedged holes from
parent holes.
Core from inclined drill holes are oriented on 3m and 6m runs using an
electronic core orientation tool (Reflex ACTIII). At the end of each run, the
bottom of hole position is marked by the driller, which is later transferred
to the whole drill core run length with a bottom of hole reference line.
Drill sample recovery Core recovery is systematically recorded from the commencement of coring to
end of hole, by reconciling recovered core measurements against driller's
depth blocks in each core tray, as recorded in the database. Driller's depth
blocks provided the depth, interval of core recovered, and interval of core
drilled. Core recoveries below the cover sequence were typically 100%, with
isolated zones of lower recovery. Cover sequence drilling by the mud-rotary
drilling did not yield recoverable samples.
Those sections of wedge holes that were Navi drilled did not produce
recoverable sample material and have not been sampled.
No specific measures have been taken to maximise recovery, other than
employing professional and well respected drillers;
There is no discernible relationship between sample recovery and the grade of
any important variable.
Logging Geological logging recorded qualitative descriptions of lithology, alteration,
mineralisation, veining, and structure (for all core drilled - 4,475 m for 6
drill holes, all intersecting mineralisation), including orientation of key
geological features.
Geotechnical measurements including Rock Quality Designation (RQD) fracture
frequency, solid core recovery and qualitative rock strength measurements were
recorded by Geologists or Geotechnical Engineers.
All geological and geotechnical logging was conducted at the Havieron site.
Magnetic susceptibility measurements were recorded every metre. The bulk
density of selected drill core intervals was determined at site on whole core
samples.
Digital data logging was captured on diamond drill core intervals only, and
all data validated and stored in a Datashed database.
All drill cores were photographed (wet and dry), prior to cutting and/or
sampling the core.
The logging is of sufficient quality to support Mineral Resource estimates,
mining studies and metallurgical studies
100 percent of recovered core in the basement rocks has been logged.
Sub-sampling techniques and sample preparation Core was cut and sampled at the Havieron core processing facilities. Half core
samples were collected in pre-numbered calico bags and grouped into bulk bags
for dispatch to the laboratory. Sample weights typically varied from 0.7 to
5.6kg. Sample sizes are considered appropriate for the style of
mineralisation. Sample lengths typically ranged from 0.2 to 2m with most
samples being 1m in length. Drill core samples were freighted by air and road
to the laboratory.
Navi drill holes did not produce recoverable material and have not been
sampled.
Sample preparation was conducted at the independent ISO17025 accredited
Intertek Laboratory, Perth (Intertek). Samples were dried at 105(o)C, and
crushed to 95% passing 4.75mm, and then split to obtain up to 3kg sub-sample,
which was pulverised (using LM5) to produce a pulped product with the minimum
standard of 95% passing 106μm. Routine grind size analysis is conducted.
Duplicate samples were collected from crush and pulp samples at a rate of
1:20.
Coarse Crush and Pulp Duplicate results show an acceptable level of
variability for the material sampled and style of mineralisation.
Periodic size checks (1:20) for crush and pulp samples and sample weights are
provided by the laboratory and recorded in the Datashed database. Field
Duplicate samples are not (routinely) taken.
Sampling and sample preparation sizes and quality control protocols are
considered appropriate to the grain size of the material being sampled.
Quality of assay data and laboratory tests Assaying of drill core samples was conducted at Intertek. All samples were
assayed for 48 elements using a 4-acid digestion followed by ICP-AES/ICP-MS
determination (method 4A/MS907), which is considered to provide a total assay
for copper. Gold analyses were determined by 50g fire assay with AAS finish
(method FA50N/AA), which is considered to provide a total assay for gold.
Sampling and assaying quality control procedures consisted of inclusion of
certified reference material (CRMs), coarse residue and pulp duplicates with
each batch (at least 1:20). Assays of quality control samples were compared
with reference samples in the Datashed database and verified as acceptable
prior to use of data from analysed batches. Batches failing QA/QC tests were
re-submitted for assay.
Laboratory quality control data, including laboratory standards, blanks,
duplicates, repeats and grind size results are captured in the Datashed
database and assessed for accuracy and precision for recent data.
Extended quality control programs including pulp samples submitted to an
umpire laboratory.
Analysis of the available quality control sample assay results indicates that
an acceptable level of accuracy and precision has been achieved and the
database contains no analytical data that has been numerically manipulated.
The assaying techniques and quality control protocols used are considered
appropriate for the data to be used for reporting Exploration Results and
Mineral Resources.
Verification of sampling and assaying Assessment of reported significant assay intervals was verified by re-logging
of diamond drill core intervals and assessment of high-resolution core
photography. The verification of significant intersections has been completed
by Newcrest personnel and Newcrest's Competent Person/Qualified Person.
No twinned holes have been drilled, however there are many 'wedge/daughter'
holes that provide close-spaced intersections in adjacent holes.
Sampling intervals defined by the geologist are electronically assigned sample
identification numbers prior to core cutting. Corresponding sample numbers
matching pre-labelled calico bags are assigned to each interval.
Electronically generated sample submission forms providing the sample
identification number accompany each submission to the laboratory. Assay
results from the laboratory with corresponding sample identification are
loaded directly into the Datashed database.
No adjustments are made to any assay data.
There are no currently known drilling, sampling, recovery, or other factors
that could materially affect the accuracy or reliability of the data.
Location of data points Drill hole collar locations were surveyed using a differential GPS with GNSS
with a stated accuracy of +/- 0.5m for all drill holes reported.
Drill rig alignment was attained using an electronic azimuth aligner.
Downhole survey was collected at 6-12m intervals in the cover sequence, and
every 6 to 30m in diamond drill core segments of the drill hole using single
shot (Axis Mining Champ Gyro). The single shot surveys have been validated
using continuous survey to surface (Axis Mining Champ) along with a selection
of drill holes re-surveyed by an external survey contactor using a DeviGyro
tool - confirming sufficient accuracy for downhole spatial recording.
All collar coordinates are provided in the Geocentric Datum of Australian
(GDA20 Zone 51). All relative depth information is reported in AHD +5000m.
A LIDAR survey was completed over the project area in Nov 2019 which was used
to prepare a DEM / topographic model for the project with a spatial accuracy
of +/- 0.1m vertical and +/- 0.3m horizontal. The topography is generally low
relief to flat, elevation within the dune corridors in ranges between 250-265m
Australian Height Datum (AHD) steepening to the southeast. Easting and
Northing coordinates are provided in the Geocentric Datum of Australian (GDA20
Zone 51) and all vertical level information is reported in AHD +5000m.
Data spacing and distribution Within the South East Crescent Zone and Breccia Zone and Eastern Breccia drill
hole spacing ranges from 50 by 100m, to 50 by 50m within the current resource
extents. Outside the resource boundary drill hole spacing ranges from 50 to
200m in lateral extent within the Breccia Zone over an area of ~2km2.
Isolated holes test targets away from the Havieron pipe.
The data spacing 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.
Samples have not been composited.
Orientation of data in relation to geological structure Drill holes targeting the Crescent Zone are oriented to intersect the steeply
dipping high-grade sulphide mineralisation zones at an angle of greater than
40 degrees. As such, the drilled length of reported intersections is typically
greater than true width of mineralisation in this Zone. Most of these holes
also intersect the adjacent Breccia Zones.
Drill holes targeting the Breccia Zones are oriented to intersect at angles
either broadly perpendicular to the adjacent Crescent Sulphide Zones, or if
drilling away from the South East Crescent Zone area, at intersections broadly
perpendicular to the elongation of the ovoid breccia body. Given the lower
level of understanding of the breccia geometries it is not possible to
quantify the relationship between drilled and true length of reported
intersections in these Zones.
The attitudes of the South East Crescent Zone and Main (Northern) Breccia Zone
and the variety in drilling orientations through such suggest no sample
orientation related biases affect these zones.
The Eastern Breccia, which is interpreted to strike north-westerly and dip
steeply, is intersected almost exclusively with moderate-steep west-to-east
drilling.
Sample security The security of samples is controlled by tracking samples from drill rig to
database.
Drill core was delivered from the drill rig to the Havieron core yard every
shift. On completion of geological and geotechnical logging, core processing
was initially completed by Newcrest personnel at the Telfer facility but later
done at the Havieron facility once it was operational.
Samples were freighted in sealed bags by air and road to the Laboratory,
within the custody of Newcrest representatives. Sample numbers are generated
directly from the database. All samples are collected in pre-numbered calico
bags.
Verification of sample numbers and identification is conducted by the
laboratory on receipt of samples, and sample receipt advice issued to
Newcrest.
Details of all sample movement are recorded in a database table. Dates, Hole
ID sample ranges, and the analytical suite requested are recorded with the
dispatch of samples to analytical services. Any discrepancies logged at the
receipt of samples into the analytical services are validated.
Audits or reviews Internal reviews by Newcrest (JV Manager) of the core handling, sample
preparation and assays laboratories are conducted on a regular basis by both
project personnel and owner representatives and have not identified any
material issues affecting the reliability of the sampling techniques and data.
In the Competent Person's opinion, the sample preparation, security and
analytical procedures are consistent with current industry standards and are
appropriate and acceptable for the styles of mineralisation identified and
will be appropriate for use in the reporting of Exploration Results and
Mineral Resource estimates. No drilling, sampling or recovery factors that
materially impact the reliability of the results of the drilling programme
have been identified.
Section 2 Reporting of Exploration Results
Criteria Commentary
Mineral tenement and land tenure status The Havieron Project is located within mining tenement M45/1287 and is jointly
owned by Greatland Pty Ltd and Newcrest Operations Limited ("Newcrest").
Newcrest has entered into a Joint Venture Agreement (effective 30 November
2020) and Farm-In Agreement (effective 12 March 2019) with Greatland Pty Ltd
and Greatland Gold plc. Newcrest is entitled (subject to the terms of the
Joint Venture Agreement) to a joint venture interest of 70% (Greatland 30%).
Newcrest also has an option to acquire a further 5% joint venture interest at
fair market value under the principles outlined in the Joint Venture
Agreement.
Newcrest and the WDLAC are parties to an ILUA which relates to the use of
native title land for Newcrest's current operations at Telfer and its
activities within a 60-km radius around Telfer and includes its exploration
activities at Havieron. The parties have agreed that the ILUA will apply to
any future development activities by the Joint Venture Participants (Newcrest
and Greatland) at Havieron.
The mining tenement M45/1287 was granted on 10 September 2020.
Exploration done by other parties Newcrest completed six core holes in the vicinity of the Havieron Project from
1991 to 2003. Greatland Gold completed drill targeting and drilling of nine
Reverse Circulation (RC) drill holes with core tails for a total of
approximately 6,800m in 2018. Results of drilling programs conducted by
Greatland have previously been reported on the Greatland website.
Geology The Havieron Project is located within the north-western exposure of the
Palaeo-Proterozoic to Neoproterozoic Paterson Orogen (formerly Paterson
Province), 45 km east of Telfer. The Yeneena Supergroup hosts the Havieron
prospect and consists of a 9km thick sequence of marine sedimentary rocks and
is entirely overlain by approximately 420m of Phanerozoic sediments of the
Paterson Formation and Quaternary aeolian sediments.
Gold and copper mineralisation at Havieron consist of breccia, vein and
massive sulphide replacement gold and copper mineralisation typical of
intrusion-related and skarn styles of mineralisation. Mineralisation is hosted
by metasedimentary rocks (meta-sandstones, meta-siltstones and meta-carbonate)
and intrusive rocks of an undetermined age. The main mineral assemblage
contains well developed pyrrhotite-chalcopyrite and pyrite sulphide mineral
assemblages as breccia and vein infill, and massive sulphide lenses. The main
mineralisation event is associated with
amphibole-carbonate-biotite-sericite-chlorite wall rock alteration. Drilling
has partially defined the extents of mineralisation which are observed over a
650m by 350m ovoid area, and to depths of up to 1500m below surface.
Drill hole Information As provided in Appendix II. Refer to previous exploration releases for
drillhole information of the previously reported intercepts highlighted in
this report.
Data aggregation methods Significant assay intercepts are reported as (A) length-weighted averages
exceeding 1.0g/t Au greater than or equal to 10m, with a maximum of 5m
consecutive internal dilution; and (B) length-weighted averages exceeding
0.2g/t Au for greater than or equal to 20m, with a maximum of 10m consecutive
internal dilution, and (C) intervals of >30g/t with no internal dilution
which are greater or equal to 30 gram metres (Au_ppm x length). No top cuts
are applied to intercept calculations.. Refer to previous exploration
releases for drillhole information of the previously reported intercepts
highlighted in this report and used in the Mineral Resource Estimate.
Relationship between mineralisation widths and intercept lengths Significant assay intervals reported represent apparent widths. Drilling is
not always perpendicular to the dip of mineralisation and true widths are less
than downhole widths. Estimates of true widths will only be possible when all
results are received, and final geological interpretations have been
completed.
Balanced reporting This is the twenty second release of Exploration Results for this project made
by Newcrest and/ or Greatland Gold. Previous release dates are 25 July 2019,
10 September 2019, 24 October 2019, 2 December 2019, 30 January 2020, 11 March
2020, 30 April 2020, 11 June 2020, 23 July 2020, 10 September 2020, 29 October
2020, 10 December 2020, 28 January 2021, 11 March 2021, 29 April 2021, 10 June
2021, 22 July 2021, 9 September 2021, 28 October 2021 and 9 December 2021, 28
January 2022 and 10 March 2022.
Previous exploration programs conducted by Newcrest and Greatland have been
reported. Exploration drilling programs are ongoing and further material
results will be reported in subsequent releases.
Other substantive exploration data Nil
Further work Growth drilling is underway to extend the limits of the mineralised system at
depth and looking to establish additional resources outside those defined to
date, including extension and infill of the Eastern Breccia and drilling
outside the Havieron mineralised system as defined to date.
APPENDIX II
Drillhole Data and Au- Cu Significant Intersections
Havieron Project, Paterson Province, Western Australia
Reporting Criteria: Intercepts reported are downhole drill width (not true
width) Au >0.20ppm (0.2g/t Au) and minimum 20m downhole width with maximum
consecutive internal dilution of 10m. Average grades are based on
length-weighting of samples grades. Also highlighted are high grade intervals
of Au >1.0ppm (1g/t Au) and minimum 10m downhole width with maximum
consecutive internal dilution of 5m, and intervals of >30g/t which are
greater or equal to 30 gram metres (Au_ppm x length) are tabled. Gold and
copper grades are reported to two significant figures, the downhole lengths
are rounded to 0.1m which may cause some apparent discrepancies in interval
widths. Samples are from core drilling which is PQ, HQ or NQ in diameter. Core
is photographed and logged by the geology team before being cut. Half core PQ,
HQ and NQ samples are prepared for assay and the remaining material is
retained in the core farm for future reference. Each assay batch is submitted
with duplicates and standards to monitor laboratory quality. Total depth (end
of hole) is rounded to one decimal place for reporting purposes. Collars
denoted with a * show partial results, with further significant assays to be
reported in subsequent exploration updates.
Hole ID Hole Type Easting (m) Northing (m) RL (m) Total Depth (m) Azimuth Dip From (m) To (m) Interval (m) Au (ppm) Cu (pct) Cut off
HAD055W4 MR-DD 463715 7597341 263 1033 47 -56 Assays Pending
HAD055W5 MR-DD 463715 7597341 263 1144.5 47 -56 Assays Pending
HAD085W6 MR-DD 463489 7598058 255 1513.3 111 -63 1062 1117.6 55.6 0.82 0.04 0.2 g/t Au
1134.1 1159.7 25.7 0.39 0.04 0.2 g/t Au
1174.3 1238.8 64.4 2.1 0.06 0.2 g/t Au
Incl. 1199.6 1223.4 23.7 5.3 0.1 1.0 g/t Au
Incl. 1208.9 1209.2 0.3 121 0.06 30 g.m. Au
1249.9 1278 28.1 0.51 0.09 0.2 g/t Au
1327 1379 52 3 0.09 0.2 g/t Au
Incl. 1361.1 1379 17.9 7.7 0.07 1.0 g/t Au
Incl. 1376.3 1376.8 0.5 70 0.03 30 g.m. Au
HAD085W7 MR-DD 463489 7598058 255 1706.1 111 -63 1329.7 1359 29.3 0.53 0.09 0.2 g/t Au
1534 1569.7 35.7 2.3 0.04 0.2 g/t Au
Incl. 1551 1568 17 2.5 0.07 1.0 g/t Au
HAD093A MR-DD 463522 7597783 256 1525.8 77 -66 694.3 717 22.7 0.39 0.03 0.2 g/t Au
728.6 800 71.5 1.1 0.1 0.2 g/t Au
Incl. 765.2 766.1 0.8 60 0.37 30 g.m. Au
886.6 1160.2 273.6 1.1 0.14 0.2 g/t Au
Incl. 993.4 1009 15.7 3 0.51 1.0 g/t Au
Incl. 1074 1087.8 13.8 2 0.32 1.0 g/t Au
Incl. 1133.6 1157.1 23.5 2 0.3 1.0 g/t Au
1263 1293.5 30.5 1.2 0.13 0.2 g/t Au
1306.1 1382.8 76.7 1.9 0.07 0.2 g/t Au
Incl. 1307.2 1307.6 0.4 101 0.13 30 g.m. Au
Incl. 1347.8 1366 18.2 3.7 0.17 1.0 g/t Au
Incl. 1364.7 1365.4 0.7 56 0.25 30 g.m. Au
1392.9 1449 56.1 0.22 0.09 0.2 g/t Au
1460.5 1525.8 65.3 0.44 0.1 0.2 g/t Au
HAD104^^ MR-DD 463522 7597782 257 1913.6 87 -63 642.9 677.6 34.8 1.1 0.06 0.2 g/t Au
792.1 819.9 27.8 0.29 0.06 0.2 g/t Au
835 855.1 20.1 3.4 0.43 0.2 g/t Au
866.9 895.3 28.4 0.63 0.15 0.2 g/t Au
956.2 1092.6 136.4 0.72 0.09 0.2 g/t Au
1546.5 1609 62.5 5.9 0.3 0.2 g/t Au
Incl. 1554.6 1604 49.4 7.1 0.38 1.0 g/t Au
1717 1802 85 1.2 0.37 0.2 g/t Au
Incl. 1735.6 1746.5 10.9 3 0.38 1.0 g/t Au
HAD133W6^ MR-DD 464072 7598317 257 1639.5 171 -65 1367 1413 46 0.92 0.01 0.2 g/t Au
1424.6 1597.8 173.2 1.9 0.18 0.2 g/t Au
Incl. 1425.9 1469 43.1 3.7 0.34 1.0 g/t Au
Incl. 1531.8 1550 18.2 2.6 0.31 1.0 g/t Au
Incl. 1555.5 1567 11.5 5.4 0.04 1.0 g/t Au
HAD133W8 MR-DD 464072 7598317 257 1696 171 -65 1471.9 1513.5 41.6 0.82 0.07 0.2 g/t Au
Incl. 1474 1487 13 1.4 0.14 1.0 g/t Au
1533 1555 22 0.24 0.01 0.2 g/t Au
1648 1672 24 0.39 0.02 0.2 g/t Au
HAD133W9 MR-DD 464072 7598317 257 1720.1 171 -65 Assays Pending
HAD145AW1 MR-DD 463201 7597817 256 2041.3 75 -65 1633 1692.2 59.2 0.91 0.14 0.2 g/t Au
MR-DD Incl. 1639.9 1651.6 11.7 3.5 0.53 1.0 g/t Au
MR-DD 1730.4 1763.3 32.9 1.5 0.63 0.2 g/t Au
MR-DD Incl. 1730.4 1761 30.6 1.6 0.68 1.0 g/t Au
MR-DD 1827.9 1978 150.1 3.7 0.15 0.2 g/t Au
MR-DD Incl. 1854 1896.3 42.3 8.6 0.4 1.0 g/t Au
MR-DD Incl. 1855 1857 2 17 0 30 g.m. Au
MR-DD Incl. 1859.1 1861 1.9 21 0.39 30 g.m. Au
MR-DD Incl. 1880.3 1882 1.7 23 0.44 30 g.m. Au
MR-DD Incl. 1886 1887.1 1.1 37 0.47 30 g.m. Au
MR-DD Incl. 1907 1925 18 2.5 0.08 1.0 g/t Au
MR-DD Incl. 1930.9 1954 23.2 3.1 0.01 1.0 g/t Au
HAD152 MR-DD 463402 7597058 254 2056.9 29 -62 1558.1 1558.4 0.4 112 0 30 g.m. Au
MR-DD 1726 1756 30 0.54 0.17 0.2 g/t Au
MR-DD 1767 1830 63 0.98 0.13 0.2 g/t Au
MR-DD Incl. 1771 1783.2 12.2 1.6 0.22 1.0 g/t Au
HAD153 464786 7598418 269 726 201 -60 Assays Pending
HAD154 463629 7597438 261 1242.5 95 -55 Assays Pending
HAD155 464535 7598537 257 837.4 250 -60 Assays Pending
(#)drilling in progress. **partial intercept, assays pending. ^updated
intercept. ^^previously reported intercept.
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