Bulk Ore Sorting Testwork Achieves Outstanding Results
Released
Released
Announcement PDF
ASX Announcement
8 July 2024
Bulk Ore Sorting Testwork Achieves High Spodumene
Recovery and Improved Feed Grades
Highlights
•
Feasibility-level ore sorting test work completed on bulk sample of Mavis Lake ore.
•
Test work confirms suitability of Mavis Lake ore to pre-concentration by ore sorting.
•
Results achieved a 30% increase in feed grade.
•
Lithia grades increased by 30%, from 1.00% Li2O in sorter feed to 1.30% Li2O in sorter
product.
•
Bulk XRT ore sorting rejected 97% of waste rock, removing 96% of iron minerals.
•
Iron was effectively reduced from 7.52% Fe2O3 in sorter feed to 0.49% Fe2O3 in sorter product.
•
Near 100% spodumene recovery to product.
•
Pre-concentration of mined ore can reduce the capital required for plant construction,
enables lower processing costs and increased spodumene concentrate production.
Lithium exploration and project development company Critical Resources Limited ASX:CRR
(“Critical Resources” or “the Company”) is pleased to report outstanding results from its current phase
of metallurgical test work (bulk testing) on ore from the Mavis Lake Lithium Project in Ontario,
Canada.
Feasibility Level Testing Methodology
Critical Resources commenced its feasibility level metallurgical test work program in May 2024. A
total of 1,650kg of drill core was submitted to Saskatchewan Research Council (SRC) for feasibilitylevel testing.
The sample suite of drill core represents 11 pegmatite intercepts totaling 196m across four HQ drill
holes, from a range of spatial locations within the current mineral resource estimate (MRE) at Mavis
Lake. The sample suite included ore from depths ranging from 52.7m – 249.3m below surface. The
sample suite also comprised waste rock intended to be representative of typical dilution expected
from conventional mining methods.
The samples were separated into two lithology composites. The Standard Pegmatite composite
consists of pegmatites more than 0.5m from the host rock contact zone. These pegmatite samples
comprised zero (0) waste rock dilution and are generally coarser grained. This is the predominant
pegmatite mineralogy at Mavis Lake.
Critical Resources Limited
ABN 12 145 184 667
ASX:CRR
Level 45, 108 St Georges Terrace, Perth WA 6000
P. +61 (8) 9465 1024 W. criticalresources.com.au E. info@criticalresources.com.au
The Contact Zone Pegmatite composite consists of pegmatites within 0.5m of the host rock contact
zone. These pegmatite samples are generally finer grained and more altered. The Contact Zone
Pegmatite composite also comprised ~40% waste rock to reflect worst case mining dilution.
Although Contact Zone pegmatites are a minority within the Mavis Lake deposit, their distinct
mineralogy and increased likelihood of mining dilution warrant in depth metallurgical investigation.
Ore sorting has become increasingly adopted in hard rock lithium mining to effectively pre-treat
contact zone pegmatites. Ore sorting is employed to reject waste rock and mining dilution from ROM
feed, pre-concentrating the ore prior to downstream processing.
This has the advantage of increasing feed grades to the processing plant, de-bottlenecking dense
medium separation (DMS) and flotation circuits, increasing spodumene production and improving
concentrate quality.
Testing Process
The Contact Zone Pegmatite was crushed and screened to +25mm -75mm. A 680kg sub sample was
then subjected to bulk XRT ore sorting to separate waste rock from pegmatite.
Testwork results summarised in Table 1 and Table 2 show that ore sorting achieved 40% mass rejection
to waste, removing 100% of iron bearing waste minerals ferrohornblende and holmquistite as seen in
figure 1.
Spodumene recovery to sorter product was 100%. Lithia grades increased by 30%, from 1.00% Li2O in
sorter feed to 1.30% Li2O in sorter product. Iron was effectively reduced from 7.52% Fe2O3 in sorter
feed to 0.49% Fe2O3 in sorter product.
Table 1 - Bulk XRT Sort - Mass Balance and Assays
Mass
Assays (wt%)
Stream
kg
%
Li2O
Fe2O3
SiO2
Al2O3
K2O
Na2O
MnO
CaO
MgO
XRT Product
408.5
60
XRT Waste
1.30
0.49
74.2
16.8
2.65
4.40
0.08
0.3
0.1
271.7
40
0.53
18.10
51.7
13.6
0.48
1.88
0.33
8.4
4.1
Feed (calc.)
680.2
100
1.00
7.52
65.2
15.5
1.78
3.39
0.18
3.5
1.7
Table 2 - Bulk XRT Sort - Mineral Balance
Mass
Distribution (%)
Stream
kg
%
Spodumene
Quartz
Albite
Orthoclase
Muscovite
Ferrohornblende
Holmquistite
XRT Product
408.5
60
XRT Waste
100
66
82
100
100
0
0
271.7
40
0
34
18
0
0
100
100
Feed (calc.)
680.2
100
100
100
100
100
100
100
100
Page 2 of 15
Figure 1 - Bulk ore sorting results showing mafic waste rock (top) separated from Contact
Zone pegmatite (bottom)
Page 3 of 15
The bulk ore sorting testwork results confirm the findings of amenability studies completed earlier this
year (refer to ASX Announcement 2 May 2024). Mavis Lake ore is highly amenable to preconcentration by XRT sorting in the coarse, dry phase of the flowsheet.
The ability to reject mining dilution prior to processing helps unlock the full potential of the Mavis Lake
resource. By removing iron bearing minerals early in the beneficiation flowsheet (refer to figure 2),
the performance of both dense medium separation (DMS) and flotation processes can be optimised.
This facilitates higher plant throughout rates, increased spodumene recoveries and an improved
spodumene concentrate quality.
Figure 2 – Proposed Flowsheet for Mavis Lake ore
Page 4 of 15
Figure 3 – XRT Testing Facility at SRC Canada
This announcement has been approved for release by the Board of Directors.
-endsFor further information please contact
E: info@criticalresources.com.au
P: +61 (8) 9465 1024
Page 5 of 15
ABOUT CRITICAL RESOURCES LIMITED Critical Resources is focused on the exploration, development and delivery of the
critical metals required for a decarbonized future, underpinned by a portfolio of lithium projects in Ontario, Canada which
are ideally positioned to participate in the rapidly growing North American battery materials supply chain.
The Company’s principal focus is on its flagship Mavis Lake Lithium Project in Ontario, Canada, where it has completed
over 45,000m of drilling and defined a maiden Inferred Mineral Resource of 8Mt grading 1.07% Li2O. Recent exploration
success has demonstrated substantial potential to expand this resource and make new discoveries in the surrounding
area. Critical is progressing a dual-track strategy at Mavis Lake of targeting resource growth in parallel with multiple
permitting and project development workstreams.
ABOUT SASKATCHEWAN RESEARCH COUNCIL The Saskatchewan Research Council (SRC) is Canada’s second largest
research and technology organization. SRC focuses its efforts on the mining, minerals, agriculture and energy sectors, and
the environmental considerations that are important across each sector. SRC’s Mining and Energy Division provides
applied research, development and demonstration to exploration and mining companies, as well as oil and gas
producers and pipeline operators. The Mineral Processing Business Unit provides leading-edge solutions to mining and
mineral clients. Services focus on RD&D for uranium, potash, rare earths, lithium, diamonds, gold, base metals, industrial
minerals (mineral sands, quartz, feldspars) and other priority minerals.
COMPETENT PERSONS STATEMENT The information in this ASX Announcement that relates to Metallurgical results is based
on information compiled by Mr Brady Jenkins, a Competent Person who is a Member of the Australian Institute of Mining
and Metallurgy (MAusIMM). Mr Jenkins is an employee of Critical Resources. Mr Jenkins has sufficient experience in mineral
processing of this nature to qualify as a Competent Person as defined in the 2012 Edition of the “Australasian Code for
Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Mr Jenkins consents to the inclusion in this
Announcement in the form and context in which it appears.
The information in this ASX Announcement that relates to Exploration Results is based on information compiled by Mr. Troy
Gallik (P. Geo), a Competent Person who is a Member of the Association of Professional Geoscientists of Ontario. Troy
Gallik is a full-time employee of Critical Resources. Mr. Gallik has sufficient experience that is relevant to the style of
mineralisation and type of deposit under consideration and to the activity being undertaken to qualify as a Competent
Person as defined in the 2012 Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and
Ore Reserves”. Mr. Gallik consents to the inclusion in this Announcement of the matters based on his information in the
form and context in which it appears.
FORWARD LOOKING STATEMENTS This announcement may contain certain forward-looking statements and projections.
Such forward looking statements/projections are estimates for discussion purposes only and should not be relied upon.
Forward looking statements/projections are inherently uncertain and may therefore differ materially from results ultimately
achieved. Critical Resources Limited does not make any representations and provides no warranties concerning the
accuracy of the projections and disclaims any obligation to update or revise any forward-looking statements/projects
based on new information, future events or otherwise except to the extent required by applicable laws. While the
information contained in this report has been prepared in good faith, neither Critical Resources Limited or any of its
directors, officers, agents, employees or advisors give any representation or warranty, express or implied, as to the fairness,
accuracy, completeness or correctness of the information, opinions and conclusions contained in this announcement.
Page 6 of 15
Appendix 1 – Samples and Related Exploration Results
Table A1-1 - ICP Assays - Ore Sorting Products
XRT Stream
Li
ppm
Li2O
wt %
Fe2O3
wt %
SiO2
wt %
Al2O3
wt %
K2O
wt %
Na2O
wt %
MnO
wt %
CaO
wt %
Assays
MgO
wt %
P2O5
wt %
TiO2
wt %
Ba
ppm
Cr
ppm
Sc
ppm
Sr
ppm
Y
ppm
Zr
ppm
LOI
wt %
Product
6060
1.30
0.49
74.2
16.8
2.65
4.4
0.08
0.27
0.06
0.27
0.02
12
173
<2
38
<2
21
0.50
Waste
2480
0.53
18.1
51.7
13.6
0.48
1.88
0.33
8.42
4.06
0.20
1.46
87
83
37
157
44
131
0.40
Table A1-2 - XRD Assays - Ore Sorting Products
XRD Mineralogy
Spodumene
wt %
Quartz
wt %
Albite
wt %
Orthoclase
wt %
Muscovite
wt %
Ferrohornblende
wt %
Holmqistite
wt %
Total
wt %
Product
16.2
30.1
37.3
11.7
4.8
0.0
0.0
100.1
Waste
0.0
23.2
12.6
0.0
0.0
44.4
19.8
100
XRT Stream
Table A1-3: List of samples taken for metallurgical testwork composite.
Samples for Metallurgical Testwork
Twinned
Hole
Core
Type
From
(m)
To (m)
Length
(m)
Est. Sample
(kg)
MET23-002
MF22-121
HQ
46.0
64.5
18.5
155
MET23-003R
MF22-116
HQ
52.7
54.7
2.0
17
MET23-003R
MF22-116
HQ
54.7
76.0
21.3
178
MET23-003R
MF22-116
HQ
76.0
82.8
6.8
57
MET23-003R
MF22-116
HQ
87.0
100.3
13.3
112
MET23-003R
MF22-116
HQ
110.5
123.3
12.8
108
MET23-004
MF22-163
HQ
81.5
108.0
26.5
223
MET23-004
MF22-163
HQ
112.1
123.6
11.5
97
MET23-004
MF22-163
HQ
131.3
142.9
11.6
97
MET23-005
MF23-207
HQ
177.6
186.0
8.4
71
MET23-005
MF23-207
HQ
186.0
249.3
63.3
532
Drill Hole
Page 7 of 15
JORC Table 1 – MET23-002, MET23-003R, MET23-004, MET23-005
Section 1: Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections)
Criteria
JORC-Code Explanation
Commentary
Sampling
techniques
Nature and quality of sampling • Drill core samples were provided by drill holes from the 2022
(e.g., cut channels, random
and 2023 Mavis Lake Drill Program performed by Critical
Resources Limited.
chips, or specific specialised
industry standard measurement
tools appropriate to the
minerals under investigation,
• Oriented NQ core was cut in half and quarters using a
such as down hole gamma
diamond saw.
sondes, or handheld XRF
instruments, etc). These
• No other measurement tools other than directional survey
examples should not be taken tools have been used in the holes at this stage.
as limiting the broad meaning
• Oriented core was placed V-rail and a consistent cut-line
of sampling.
drawn along core to ensure cutting (halving) of
representative samples.
• Sampling is conducted based on core logging, 100% of drill
hole core is logged. The core logger is a geologist, has
Include reference to measures experience in lithium mineralisation, and determines the
taken to ensure sample
intervals of samples. All pegmatite intersections are sampled
representivity and the
regardless of the visual presence of lithium
appropriate calibration of any minerals/spodumene. Host rock is typically not sampled as
measurement tools or systems lithium mineralisation is localized to pegmatites (spodumene
used.
mineral) or their alteration halos (holmquistite mineral) within
mafic volcanic host rock.
Aspects of the determination of
mineralisation that are Material • Determination of mineralisation has been based on
to the Public Report. In cases
geological logging and photo analysis.
where ‘industry standard’ work
has been done this would be
relatively simple (e.g., ‘reverse • Diamond Core drilling was used to obtain 3m length
circulation drilling was used to samples from the barrel which are then marked in one
obtain 1 m samples from which metre intervals based on the drillers core block
3 kg was pulverised to produce measurement.
a 30 g charge for fire assay’). In
other cases more explanation
• Ore sorting testing samples are selected based on lithology
may be required, such as
and geological logging boundaries or on the nominal metre
where there is coarse gold that
marks.
has inherent sampling
problems. Unusual commodities
or mineralisation types (e.g.,
• Samples sent to SRC were bagged on site with security tags,
submarine nodules) may
warrant disclosure of detailed shipped to Saskatchewan Research Council (SRC) via vehicle
transport and recovered by SRC Laboratory in Saskatoon,
information.
Saskatchewan Canada.
Drilling
23techniques
Drill type (e.g., core, reverse
• NQ2 and HQ2 diamond double tube coring by Cyr Drilling’s
circulation, open-hole hammer, EF-50 rig was used throughout the hole.
rotary air blast, auger, Bangka,
• Core orientation was carried out by the drilling contractor.
sonic, etc) and details (e.g.,
core diameter, triple or
standard tube, depth of
diamond tails, face-sampling
bit or other type whether core
Page 8 of 15
Criteria
JORC-Code Explanation
Drill sample
recovery
Method of recording and
• Lithological logging, photography
assessing core and chip sample
recoveries and results assessed. • Core samples were measured with a standard tape within
the core trays. Length of core was then compared to the
interval drilled, and any core loss was attributed to individual
rock units based on the amount of fracturing, abrasion of
core contacts, and the conservative judgment of the core
logger. Results of core loss are discussed below.
Measures taken to maximise
sample recovery and ensure
representative nature of the
samples.
Commentary
• Experienced driller contracted to carry out drilling.
• In broken ground the drillers produced NQ core from short
runs to maximise core recovery.
• Core was washed before placing in the core trays.
• Core was visually assessed by professional geologists before
cutting to ensure representative sampling.
Whether a relationship exists
between sample recovery and • See “Aspects of the determination of mineralisation that are
Material to the Public Report” above.
grade and whether 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 logged to a
level of detail to support
appropriate Mineral Resource
estimation, mining studies and
metallurgical studies.
• Core samples were geotechnically logged.
• Core samples have been geologically logged to support
appropriate Mineral Resource estimation, mining studies and
metallurgical studies.
• The core logging was qualitative in nature.
• All core was photographed
Whether logging is qualitative •Total length of the MF22-064 was 185m
or quantitative in nature. Core
• 100% of the relevant intersections were logged.
(or costean, channel, etc)
photography.
Total length of the MF22-121 was 137m
The total length and
percentage of the relevant
intersections logged.
• 100% of the relevant intersections were logged.
Total length of the MF23-192 was 327.75m
• 100% of the relevant intersections were logged.
Total length of the MF23-215 was 368m
• 100% of the relevant intersections were logged.
Total length of the MF23-219 was 299m
• 100% of the relevant intersections were logged.
Total length of the MF23-230 was 425m
• 100% of the relevant intersections were logged.
Total length of the SZ23-002 was 173m
• 100% of the relevant intersections were logged
Total length of the SZ23-005 was 110m
Page 9 of 15
Criteria
JORC-Code Explanation
Commentary
• 100% of the relevant intersections were logged
Total length of the SZ23-006 was 200m
• 100% of the relevant intersections were logged
Total length of the SZ23-007 was 113m
• 100% of the relevant intersections were logged
Total length of the SZ23-009 was 182m
• 100% of the relevant intersections were logged
Sub-sampling If core, whether cut or sawn
•Oriented core was placed V-rail and a consistent cut-line
techniques and and whether quarter, half or all drawn along core to ensure cutting (halving) of
sample
core taken.
representative samples.
preparation
•Core sample intervals were based in logged mineralisation
If non-core, whether riffled,
tube sampled, rotary split, etc
•No duplicates or second half-sampling.
and whether sampled wet or
dry.
• Appropriate method: oriented NQ and HQ core cut in half
using a
For all sample types, the nature,
quality and appropriateness of diamond saw, with a half core sent for assay and half core
the sample preparation
retained.
technique.
• Core samples were sent to Saskatchewan Research Council
(SRC) Laboratory for the purposes of mineralogical analysis
and ore sorting testwork.
Quality control procedures
adopted for all sub-sampling
stages to maximise
representivity of samples.
Measures taken to ensure that
the sampling is representative
of the in situ material collected,
including for instance results for
field duplicate/second-half
sampling.
Whether sample sizes are
appropriate to the grain size of
the material being sampled.
Quality of assay The nature, quality and
• Samples were previously assayed from accredited lab –
data and
appropriateness of the assaying Activation Laboratories.
laboratory tests and laboratory procedures
• Methods appropriate for style of mineralisation:
used and whether the
technique is considered partial UT-7 (Li up to 5%) QOP Sodium Peroxide (Sodium Peroxide
or total.
Fusion ICPOES + ICPMS.
Page 10 of 15
Criteria
JORC-Code Explanation
Commentary
For geophysical tools,
• Assays were released in previous announcements.
spectrometers, handheld XRF
• Either standards or blanks are inserted every 10th sample
instruments, etc, the
interval
as a part of a QAQC process. Standard and blank
parameters used in determining
results
from
recent drilling are within acceptable margins of
the analysis including
error.
instrument make and model,
reading times, calibrations
• Activation Laboratory performs internal QA/QC measures.
factors applied and their
Results are released once all internal QA/QC is verified and
derivation, etc.
confirmed to be acceptable.
Nature of quality control
• Samples sent to SRC were bagged on site with security tags,
procedures adopted (e.g.,
shipped to Saskatchewan Research Council (SRC) via vehicle
standards, blanks, duplicates, transport and recovered by SRC Laboratory in Saskatoon,
external laboratory checks)
Saskatchewan Canada.
and whether acceptable levels
of accuracy (i.e., lack of bias) • The ore sorting testing samples were sent to an accredited
laboratory – SRC Laboratory in Saskatoon, Saskatchewan,
and precision have been
Canada.
established.
• Additional assay analysis was conducted by SGS on the
concentrates
Verification of
sampling and
assaying
The verification of significant
intersections by either
independent or alternative
company personnel.
• No independent verification completed at this stage.
The use of twinned holes.
• No adjustments to the laboratory assay data.
Documentation of primary
data, data entry procedures,
data verification, data storage
(physical and electronic)
protocols.
• Core measured, photographed and logged by geologists.
Digitally recorded plus back-up records.
• No assay cut off grades are applied.
Discuss any adjustment to assay
data.
Location of
data points
Accuracy and quality of
• Drill collars initially recorded with Garmin GPS that has an
surveys used to locate drill holes accuracy in the order of ±3 metres for location. A registered
(collar and down-hole surveys), surveyor utilized DPGS survey with an accuracy of +/- 0.30m
trenches, mine workings and
other locations used in Mineral
Resource estimation.
• WGS 1984 UTM Zone 15N.
Specification of the grid system
used.
Quality and adequacy of
topographic control.
• No specific topography survey has been completed over
the project area.
Page 11 of 15
Criteria
JORC-Code Explanation
Data spacing Data spacing for reporting of
and distribution Exploration Results.
Commentary
• Not relevant to current drilling.
Whether the data spacing, and • Not relevant to current drilling.
distribution is sufficient to
establish the degree of
geological and grade
•Core sample intervals were based in logged mineralisation
continuity appropriate for the
and no sample composting applied. Reporting of final results
Mineral Resource and Ore
includes many weighted average- composting of assay data.
Reserve estimation
procedure(s) and classifications
applied.
Whether sample compositing
has been applied.
Orientation of Whether the orientation of
• The orientation of the mineralisation is unknown. The drilling
data in relation sampling achieves unbiased
program is aimed at determining orientation of the
to geological sampling of possible structures mineralisation.
structure
and the extent to which this is
known, considering the deposit • If orientation of mineralisation is known or thought to be
known, drill holes are planned to intersect at an appropriate
type.
angle relative to true width of the mineralisation. Intercepts
If the relationship between the with mineralisation released are given as downhole widths,
not true widths unless true widths are stated.
drilling orientation and the
orientation of key mineralised
structures is considered to have • It is uncertain whether sampling bias has been introduced,
introduced a sampling bias, this or whether the thickness drilled is a true thickness.
should be assessed and
reported if material.
Sample security The measures taken to ensure
sample security.
• Core samples were stored at the Dryden core yard and
core shack under lock and key before delivery
• Samples sent to SRC were bagged on site with security tags,
shipped to Saskatchewan Research Council (SRC) via vehicle
transport and recovered by SRC Laboratory in Saskatoon,
Saskatchewan Canada.
Audits or
reviews
The results of any audits or
• Not undertaken at this stage.
reviews of sampling techniques
and data.
Section 2: Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section)
Page 12 of 15
Criteria
JORC-Code Explanation Commentary
Mineral
Type, reference
• The Mavis Lake Lithium Project consists of 1097 unpatented Single
tenement and name/number, location Cell Mining Claims and six separate surface leases which secure the
and ownership including surface rights of the land required for the Project footprint.
land tenure
agreements or material
status
issues with third parties
such as joint ventures,
• All claims and leases are active and in good standing. The leases
partnerships, overriding have a term of 21 years and are not set to expire until 2032, at which
royalties, native title
time they can be renewed for an additional 21 years if required.
interests, historical sites,
wilderness or national
park and environmental
settings.
The security of the tenure
held at the time of
reporting along with any
known impediments to
obtaining a licence to
operate in the area.
Exploration
Acknowledgment and • Previous exploration has been conducted by a number of parties
done by other appraisal of exploration including Lun-Echo Gold Mines Limited (1956), Selco Mining
by other parties.
parties
Corporation (1979-1980), Tantalum Mining Corporation of Canada
Limited (1981-1982), Emerald Field Resources (2002), International
Lithium Corp (2006-2021) and Pioneer Resources Limited/Essential
Metals Limited (2018-2021).
Geology
Drill hole
Information
Deposit type, geological • The Fairservice and Mavis Lake Prospects host zoned pegmatites
setting and style of
that are prospective for lithium and tantalum
mineralisation.
A summary of all
information material to
To
the understanding of the Hole ID
Easting
Northing
RL
Azi
Dip
Depth
exploration results
including a tabulation of MF22-121
524603.3
5518047
435.67
190.1 -70.1 137
the following information
524254.3
5518025
445.371
319.9 -80.2 185
for all Material drill holes: MF22-64
MF23-192
523901.1
5518034
425.466
339.9
-69.7
327.75
MF23-215
524082.9
5518047
439.333
355
-68
368
Elevation or RL (Reduced MF23-219
Level – elevation above
MF23-230
sea level in metres) of
the drill hole collar
SZ23-002
523905.8
5518034
425.562
355
-65
299
524300.6
5517994
444.467
348
-73
425
524915.6
5517461
414.895
290
-44.7
173
Dip and azimuth of the
hole
SZ23-005
524841.3
5517581
419.713
109.9
-45.5
110
down hole length and
interception depth
SZ23-006
524840.7
5517580
419.744
45
-45.4
200
SZ23-007
524840.1
5517580
419.717
110
-60
113
SZ23-009
524770.8
5517620
430.739
109.8
-45.3
182
Easting and northing of
the drill hole collar
hole length.
Page 13 of 15
Criteria
JORC-Code Explanation Commentary
If the exclusion of this
information is justified on
the basis that the
information is not
All drill collars are re-surveyed at a later date upon completion of drill
Material and this
hole for accurate collar coordinates.
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 • Uncut.
Results, weighting
averaging techniques,
maximum and/or
minimum grade
truncations (e.g., cutting • All aggregate intercepts detailed on tables are weighted averages.
of high grades) and cutoff grades are usually
Material and should be
stated.
Where aggregate
• None used
intercepts incorporate
short lengths of highgrade results and longer
lengths of low grade
results, the procedure
used for such
aggregation should be
stated and some typical
examples of such
aggregations should be
shown in detail.
The assumptions used for
any reporting of metal
equivalent values should
be clearly stated.
Relationship These relationships are
• True width is calculated from logging geologists structural
between
particularly important in measurements from upper and lower contacts of pegmatite dyke
mineralisation the reporting of
and the host rock. Both apparent downhole lengths and true widths
widths and
Exploration Results.
are provided.
intercept
If the geometry of the
lengths
mineralisation with
respect to the drill hole • The precise geometry is not currently known but is being tested by
angle is known, its nature the planned drilling, with diamond drill hole azimuths designed to drill
normal to the interpreted mineralised structure.
should be reported.
If it is not known and only
the down hole lengths
• Only down-hole length reported, when true width not known.
are reported, there
should be a clear
statement to this effect
Page 14 of 15
Criteria
JORC-Code Explanation Commentary
(e.g., ‘down hole length,
true width not known’).
Diagrams
Balanced
reporting
Other
substantive
exploration
data
Further work
Appropriate maps and • The drilling is aimed at clarifying the structure of the mineralisation.
sections (with scales)
and tabulations of
intercepts should be
included for any
significant discovery
being reported These
should include, but not
Where comprehensive • Representative reporting of all relevant grades is provided in tables
reporting of all
to avoid misleading reporting of Exploration Results.
Exploration Results is not
practicable,
representative reporting
of both low and high
grades and/or widths
should be practiced to
a oid misleading
Other exploration data, if • Overview of exploration data leading to selection of drill targets
meaningful and material, provided.
should be reported
including (but not limited
to): geological
observations;
geophysical survey
results; geochemical
survey results; bulk
samples – size and
method of treatment;
metallurgical test results;
bulk density,
groundwater,
geotechnical and rock
characteristics; potential
The nature and scale of • Further exploration, resource defining, and metallurgical drilling will
planned further work
continue to commence throughout the Mavis Lake Project Area.
(e.g., tests for lateral
Ongoing field programs and geophysical surveys may be conducted.
extensions or depth
extensions or large-scale
step-out drilling).
Page 15 of 15
Share your feedback
Discover