REG - Greatland Gold PLC - Results of drilling at Ernest Giles
08/02/2024 07:15
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RNS Number : 4699C Greatland Gold PLC 08 February 2024
Greatland Gold plc (AIM: GGP)
E: info@greatlandgold.com
W: https://greatlandgold.com
: twitter.com/greatlandgold
NEWS RELEASE | 8 February 2024
Results of drilling at Ernest Giles
Anomalous gold mineralisation and pathfinder geochemistry confirmed and
geological model refined at Meadows Prospect
Greatland Gold plc (AIM:GGP) (Greatland or the Company) is pleased to advise
that the WA Government Exploration Incentive Scheme (EIS) co-funded drilling
program has been successfully completed and all assays returned at the Meadows
gold prospect within the Company's 100% owned Ernest Giles project (Ernest
Giles).
Highlights
§ Two diamond core (DD) holes completed for 1,267.7m
§ Anomalous mineralisation of 8m @ 0.12g/t Au from 316m returned from EGD006,
associated with alteration and anomalous pathfinder geochemistry.
§ Drilling results provide important geological and structural information to
inform a systematic reverse circulation drill program planned for this year to
systematically test highly prospective targets at Meadows prospect.
§ Ground induced polarization (IP) survey planned for later in 2024 to
further refine targets, along with further airborne geophysics.
Greatland Managing Director, Shaun Day, commented:
"Completing the Land Access Agreement and EIS co-funded drilling at Ernest
Giles is a significant milestone for the project, marking the first on-ground
exploration in over five years."
"Ernest Giles is an exciting 100% owned project that sits outside our strong
foothold in the Paterson region, in an underexplored Archean greenstone belt
that hosts many Tier 1 deposits."
"These initial results are encouraging and confirm the prospectivity of the
project. The results will inform further exploration work, including a more
extensive drilling program this year."
Completed drilling program
The two completed EIS co-funded diamond core drill holes EGD005 & EGD006
provided the first angled diamond holes and oriented core at Meadows, critical
for improving the geological understanding of the project and guiding future
targeting.
Figure 1: EIS drilling at Meadows with interpreted geology on airborne
magnetics
Drilling confirmed that gold anomalism is hosted within altered basalts,
banded iron formation (BIF) and syenite (Figure 1). The mineralised zone of
8m @ 0.12g/t Au from 316m in EGD006 is associated with thin quartz - carbonate
veinlets in silica-sericite-chlorite and albite alteration in the basalt host
(Figure 2). Hematite alteration was also observed. The syenite intersected
in EGD005 shows gold is associated with disseminated pyrite with
silica-sericite, albite and hematite alteration and quartz-carbonate veining.
Figure 2: EGD006 320-324m Mineralised intercept, with silica-sericite-chlorite
alteration and veining
The results indicate an encouraging broad, weak (Au-Ag-Cu-Zn) mineralisation.
This could be the edge of a larger system. The anomalism is geologically
controlled by generally east-dipping vein sets and vein-associated
alteration. A correlation was noted between the weak gold-silver mineralised
intercepts, geochemically anomalous, low order bismuth (Bi) values and the
chlorite-carbonate alteration zones. The peak Cu value of 1,178ppm from
390.2m in EGD006 was in a highly sulphidic altered BIF unit. These
associations can be used to better target further drilling.
Further work
A follow up RC drilling program is being designed for H2 2024, utilising the
information gained from the recently completed drilling, and historical
drilling results, to systematically test highly prospective geological targets
in the Meadows prospect, with a focus on mineralised fluid pathway elements
and an in-depth review of the alteration across the prospective folded BIF
system in the South Meadows target area.
A detailed ground induced polarization (IP) survey is being planned for later
in 2024 to refine the targeting approach. The target shear hosted Archean gold
systems regularly have an associated alteration system that includes
disseminated sulphides. The IP survey involves a number of electrical
receivers at surface recording the response created by a generator
transmitting electrical current into the ground. This electrical charge
accumulates on the surface of the individual sulphide grains, and when the
generator is turned off the sulphides slowly discharge (similar to a battery)
and the receivers at surface record this signal. The more and finer grained
sulphides in the alteration system, the stronger the signal received at
surface.
The IP survey allows rapid cost effective identification of sulphide haloes
around orebodies. Additional ongoing work will also include airborne
geophysics to better understand the geology of the entire Ernest Giles belt.
Overview of the Ernest Giles project
The Ernest Giles project is located approximately 250km north-east of the town
of Laverton and covers a folded belt of magnetic greenstone rocks (Figure 3)
which is typical of the highly gold and nickel endowed parts of the Archean
Goldfields of Western Australia. The Goldfields host large gold camps such as
Kalgoorlie, St Ives, Leonora, Laverton, Mt Magnet, Jundee, Gruyere and
Tropicana. The prospective greenstone sequence at Ernest Giles does not
outcrop and, as a consequence, is underexplored relative to the remainder of
the Goldfields.
Greatland's granted and under-application tenure at Ernest Giles comprises a
comprehensive holding over what Greatland considers are the most prospective
near surface portions of the Ernest Giles belt, covering more than 1,950km(2).
Figure 3: Laverton, Yamarna and Ernest Giles greenstone belts
Contact
For further information, please contact:
Greatland Gold plc
Shaun Day, Managing Director | info@greatlandgold.com
Nominated Advisor
SPARK Advisory Partners
Andrew Emmott / James Keeshan / Neil Baldwin | +44 203 368 3550
Corporate Brokers
Berenberg | Matthew Armitt / Jennifer Lee | +44 203 368 3550
Canaccord Genuity | James Asensio / George Grainger | +44 207 523 8000
SI Capital Limited | Nick Emerson / Sam Lomanto | +44 148 341 3500
Media Relations
UK - Gracechurch Group | Harry Chathli / Alexis Gore / Henry Gamble |
+44 204 582 3500
Australia - Fivemark Partners | Michael Vaughan | +61 422 602 720
About Greatland
Greatland is a mining development and exploration company focused primarily on
precious and base metals.
The Company's flagship asset is the world-class Havieron gold-copper project
in the Paterson Province of Western Australia, discovered by Greatland and
presently under development in joint venture with world gold major, Newmont
Corporation.
Havieron is located approximately 45km east of Newmont's existing Telfer gold
mine. The box cut and decline to the Havieron orebody commenced in February
2021. Total development now exceeds 3,060m including over 2,110m of advance in
the main access decline (as at 31 December 2023). Subject to a positive
feasibility study and Decision to Mine, Havieron is intended to leverage the
existing Telfer infrastructure and processing plant. Access to Telfer would
de-risk the development and reduces capital expenditure.
Greatland has a proven track record of discovery and exploration success and
is pursuing the next generation of tier-one mineral deposits by applying
advanced exploration techniques in under-explored regions. Greatland has a
number of exploration projects across Western Australia and in parallel to the
development of Havieron is focused on becoming a multi-commodity miner of
significant scale.
Competent Persons Statement
Information in this announcement pertaining to Reporting of Exploration
Results has been reviewed and approved by Mr Damien Stephens, a Member of the
AusIMM, who has more than 30 years relevant industry experience. Mr Stephens
is a full-time employee of the Company and has a financial interest in
Greatland. Mr Stephens 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 and Gas Companies, which outline standards of
disclosure for mineral projects. Mr Stephens consents to the inclusion in
this announcement of the matters based on this information in the form and
context in which it appears. Mr Stephens confirms that the Company is not
aware of any new information or data that materially affects the information
included in the historical market announcements, and that the form and context
in which the information has been presented has not been materially modified.
Appendix 1: 2023 Drilling at Ernest Giles
Table 1: Anomalous results from EIS Co-funded Greatland Drilling 2023
Hole ID From To Element Grade (ppm) Meters Intercept
EGD005 307 308 Au 0.20 1 1m @ 0.20ppm Au
326 327 Au 0.13 1 1m @ 0.13ppm Au
355 356 Au 0.14 1 1m @ 0.14ppm Au
365 366 Au 0.15 1 1m @ 0.15ppm Au
423 424 Au 0.17 1 1m @ 0.17ppm Au
EGD006 316 324 Au 0.12 8 8m @ 0.12ppm Au
374 375 Au 0.17 1 1m @ 0.17ppm Au
390.2 391.3 Cu 1178 1.1 1.1m @ 0.12% Cu
Note: intercepts were calculated using a 0.1ppm Au cut off, minimum interval
of 1m and maximum internal waste of 3m.
Table 2: 2023 Drilled Holes at Ernest Giles
Hole Type East North RL AHD Grid Depth Dip Drilled
EGD005 DD 602280 7017800 458 MGA20_51 567.7 -60 255
EGD006 DD 599912 7017747 458 MGA20_51 700.0 -55 255
Appendix 2: JORC Table 1
Section 1 Ernest Giles Project: Sampling Techniques and Data
Criteria JORC Code Explanation Commentary
Sampling techniques § Nature and quality of sampling (eg cut channels, random chips, or specific § Diamond drilling (Greatland 2023 Drilling)
specialised industry standard measurement tools appropriate to the minerals
under investigation) - Holes were collared and drilled with the mud rotary technique to estimated
near basement of Permian cover.
§ Include reference to measures taken to ensure sample representivity and the
appropriate calibration of any measurement tools or systems used - In Archean and Proterozoic basement, quarter core was sampled on a single
metre basis, modified by geological boundaries as decided by the geologist.
§ Aspects of the determination of mineralisation that are Material to the
Public Report - The entire sample was crushed and pulverized to provide a 50g charge for
fire assay for gold and 48 element 4 acid digest ICP-MS analysis.
§ In cases where 'industry standard' work has been done this would be
relatively simple (eg 'reverse circulation drilling was used to obtain 1 m
samples from which 3 kg was pulverised to produce a 30 g charge for fire
assay'). In other cases more explanation may be required, such as where there
is coarse gold that has inherent sampling problems. Unusual commodities or
mineralisation types (eg submarine nodules) may warrant disclosure of detailed
information
Drilling techniques § Drill type (eg core, reverse circulation, open-hole hammer, rotary air § Diamond drilling
blast, auger, Bangka, sonic, etc) and details (eg core diameter, triple or
standard tube, depth of diamond tails, face-sampling bit or other type, - A diamond core drilling rig was used to complete angled holes.
whether core is oriented and if so, by what method, etc)
- A combination of HQ and NQ2 core size was used.
- Core was orientated every 3-6m run or as practicable, using the ACT3 tool
Drill sample recovery § Method of recording and assessing core and chip sample recoveries and § Recovery is measured on core and reconciled against driller's depth blocks
results assessed in each core tray. Basement core recovery is typically around 100%
§ Measures taken to maximise sample recovery and ensure representative nature § No specific measures have been taken to maximise recovery, other than
of the samples employing skilled drillers
§ Whether a relationship exists between sample recovery and grade and whether § No relationship between recovery and grade has been observed
sample bias may have occurred due to preferential loss/gain of fine/coarse
material
Logging § Whether core and chip samples have been geologically and geotechnically § The logging comprises a combination of quantitative and qualitative
logged to a level of detail to support appropriate Mineral Resource features. The entire hole is logged.
estimation, mining studies and metallurgical studies
§ Geological logging recorded qualitative descriptions of lithology,
§ Whether logging is qualitative or quantitative in nature. Core (or costean, alteration, mineralisation, veining, and structure of key geological features.
channel, etc) photography
§ Digital data was recorded on site and stored in an SQL database.
§ The total length and percentage of the relevant intersections logged.
§ pXRF and mag susc measurements were taken of every metre of core in the
targeted basement Archaean lithologies.
Sub-sampling techniques and sample preparation § If core, whether cut or sawn and whether quarter, half or all core taken. § All samples were freighted by road to the laboratory.
§ If non-core, whether riffled, tube sampled, rotary split, etc and whether § All core is cut with an automatic core saw, and quarter core samples sent
sampled wet or dry to the laboratory for assay.
§ For all sample types, the nature, quality and appropriateness of the sample § All drill samples were sent to Intertek Laboratories in Kalgoorlie for
preparation technique sample prep and to Perth for analysis.
§ Quality control procedures adopted for all sub-sampling stages to maximise § As part of the terms of the EIS co-funding arrangement, the preserved half
representivity of samples core is sent to the DEMIRS Core Library for permanent storage and later XRF
scanning.
§ Measures taken to ensure that the sampling is representative of the in situ
material collected, including for instance results for field § The sample sizes (0.5-3kg) are considered appropriate for the material
duplicate/second-half sampling being sampled.
§ Whether sample sizes are appropriate to the grain size of the material
being sampled
Quality of assay data and laboratory tests § The nature, quality and appropriateness of the assaying and laboratory § The drill samples were assayed for Au by a 50g fire assay and multi-element
procedures used and whether the technique is considered partial or total scan using 4 acid digest and MS and OES finish for pathfinder and
lithogeochemical elements. The assays are considered total rather than partial
§ For geophysical tools, spectrometers, handheld XRF instruments, etc, the
parameters used in determining the analysis including instrument make and § Blanks and CRMs were inserted roughly every 25 samples in diamond core.
model, reading times, calibrations factors applied and their derivation, etc
§ laboratories in- house QA/QC methods include duplicates , standard and
§ Nature of quality control procedures adopted (eg standards, blanks, blank assays for each batch.
duplicates, external laboratory checks) and whether acceptable levels of
accuracy (ie lack of bias) and precision have been established. § Analysis of the quality control sample assay results indicates that an
acceptable level of accuracy and precision has been achieved.
§ Comparison of the original laboratory files and the database plus database
logs indicates no analytical data has been numerically manipulated.
Verification of sampling and assaying § The verification of significant intersections by either independent or § No twinned holes have been completed
alternative company personnel.
§ All data entry procedures, including original logging, sample depth
§ The use of twinned holes selection for sampling and recording of sample numbers are recorded digitally
in an electronic database
§ Documentation of primary data, data entry procedures, data verification,
data storage (physical and electronic) protocols § There are no adjustments to assay data, other than below detection samples
are reported at negative one half the detection limit.
§ Discuss any adjustment to assay data.
Location of data points § Accuracy and quality of surveys used to locate drill holes (collar and § Drill collar and surface sample locations were surveyed using hand held
down-hole surveys), trenches, mine workings and other locations used in GPS. RL's were collected with the same GPS
Mineral Resource estimation.
§ Holes were aligned by compass mark out and field checking by the geologist
§ Specification of the grid system used.
§ Downhole survey was by AXIS gyro tool every 30m downhole as drilling
§ Quality and adequacy of topographic control progressed
§ The topography is generally low relief to flat, elevation within the dune
corridors in ranges between 250-265m AHD steepening to the southeast
§ All coordinates are provided in the Geocentric Datum of Australian (MGA2020
Zone 51). All relative depth information is reported in Australian Height
Datum (AHD)
Data spacing and distribution § Data spacing for reporting of Exploration Results Diamond drilling was designed to test stratigraphy and follow up previous Au
anomalism in vertical RC holes, testing geochemical and geophysical anomalies.
§ Whether the data spacing and distribution is sufficient to establish the
degree of geological and grade continuity appropriate for the Mineral Resource The drill data spacing is not sufficient for calculation of a mineral resource
and Ore Reserve estimation procedure(s) and classifications applied or reserve and none is reported.
§ Whether sample compositing has been applied
Orientation of data in relation to geological structure § Whether the orientation of sampling achieves unbiased sampling of possible § Drilling was angled at 55 - 60(o) into what are expected to be dominantly
structures and the extent to which this is known, considering the deposit type vertical stratigraphy.
§ If the relationship between the drilling orientation and the orientation of
key mineralised structures is considered to have introduced a sampling bias,
this should be assessed and reported if material
Sample security § The measures taken to ensure sample security The security of samples is controlled by tracking samples from drill rig to
database
Audits or reviews § The results of any audits or reviews of sampling techniques and data § No audits or reviews have been completed
Section 2 Ernest Giles Project: Reporting of Exploration Results
Criteria JORC Code explanation Commentary
Mineral tenement and land tenure status Type, reference name/number, location and ownership including agreements or The Ernest Giles tenements E38/3185 and E38/2205 are 100% owned by Greatland
material issues with third parties such as joint ventures, partnerships, Pty Ltd
overriding royalties, native title interests, historical sites, wilderness or
national park and environmental settings Land Access Agreements were negotiated with the native title holders and
claimants for the tenements in use for the drilling program.
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
Exploration done by other parties Acknowledgment and appraisal of exploration by other parties CRA initially carried out an aeromagnetic survey in the mid 90's.
WMC after reviewing the geophysics interpreted the area as containing Archean
greenstones, and completed regional soils and gravity surveys along with 200m
spaced aeromagnetic and 8 RC holes (ENGC01-8) over what is now the Meadows
prospect, identifying anomalous gold between 1996 and 1999.
MRG metal completed further aeromagnetics and 3 diamond holes
(EY4001-EY4003) in the region from 2011 to 2015.
Geology Deposit type, geological setting and style of mineralisation Exploration is for Yilgarn style Archean lode gold deposits.
Drill hole Information A summary of all information material to the understanding of the exploration Drill hole collar details are listed in Appendix 1 (Table 2) and anomalous
results including a tabulation of the following information for all Material results in Appendix 1 (Table 1).
drill holes:
easting and northing of the drill hole collar
elevation or RL (Reduced Level - elevation above sea level in metres) of the
drill hole collar
dip and azimuth of the hole
down hole length and interception depth
hole length
If the exclusion of this information is justified on the basis that the
information is not Material and this exclusion does not detract from the
understanding of the report, the Competent Person should clearly explain why
this is the case
Data aggregation methods In reporting Exploration Results, weighting averaging techniques, maximum No economically significant results have been reported, and no data
and/or minimum grade truncations (eg cutting of high grades) and cut-off aggregation methods have been applied
grades are usually Material and should be stated
Where anomalous results are quoted (Appendix 1, Table 1) the samples have been
Where aggregate intercepts incorporate short lengths of high grade results and selected as follows:
longer lengths of low grade results, the procedure used for such aggregation
should be stated and some typical examples of such aggregations should be Au >0.1ppm with a maximum consecutive internal waste of 3m
shown in detail
The assumptions used for any reporting of metal equivalent values should be
clearly stated
Relationship between mineralisation widths and intercept lengths These relationships are particularly important in the reporting of Exploration No economically significant results are reported, and there is no known
Results relationship between reported widths and the geometry of any mineralisation.
If the geometry of the mineralisation with respect to the drill hole angle is All intercepts are reported downhole as true width is not known.
known, its nature should be reported
If it is not known and only the down hole lengths are reported, there should
be a clear statement to this effect (eg 'down hole length, true width not
known')
Diagrams Appropriate maps and sections (with scales) and tabulations of intercepts Maps are provided in Figures 1 &2. No significant discovery is reported.
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
Balanced reporting Where comprehensive reporting of all Exploration Results is not practicable, The reporting is considered balanced
representative reporting of both low and high grades and/or widths should be
practiced to avoid misleading reporting of Exploration Results
Other substantive exploration data Other exploration data, if meaningful and material, should be reported No other substantive exploration data other than that provided in the figures
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
Further work The nature and scale of planned further work (eg tests for lateral extensions Systematic .infill of anomalous RC and diamond drilling and ground geophysics
or depth extensions or large-scale step-out drilling) programs are planned for the Meadows prospect
Diagrams clearly highlighting the areas of possible extensions, including the
main geological interpretations and future drilling areas, provided this
information is not commercially sensitive
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