Tallebung Tin Project Update
Released
Released
Announcement PDF
ASX: SKY
ASX ANNOUNCEMENT
15 January 2025
TALLEBUNG TIN PROJECT IN NSW ADVANCING ON MULTIPLE
FRONTS
TRENCHING, DRILLING AND METALLURGICAL TESTWORK TO DRIVE PROJECT FORWARD
Trenching intersects multiple zones of visual tin mineralisation
All six trenches completed late 2024 intercepted visual tin mineralisation1 at surface and
across the entire project area. The program comprised six trenches for 201m of trenching.
Trenches have been channel sampled, with results expected in the next fortnight.
Following receipt of these results, 3-4 zones will be selected to extract bulk samples for a
total of between 50-80 tonnes of mineralisation to give SKY an outstanding opportunity to:
Optimise the entire metallurgical flowsheet in a pilot-scale plant;
Produce tin concentrate for ongoing marketing and end-user engagement;
Increase confidence in Resource estimation with tin produced from the bulk
samples to be reconciled with the grade estimate to validate the MRE model.
Excellent metallurgical testwork results show increased tin recovery:
Exceptional results were received last year from TOMRA ore sorting testwork utilising more
aggressive and higher rejection sorting, with results including:
-
0.10% tin sample upgraded to 4.42% tin (44x upgrade) and 342g/t silver with 83% recovery
of tin achieved, representing a 98.1% reduction in the mass after sorting.
Heavy Liquid Separation (HLS) testwork in late 2024 showed that a 1.50% tin product can be
concentrated via HLS to recover 75% of the tin in the waste from aggressive ore sorting
waste.
Results highlight the exceptional amenability of the Tallebung tin to simple, low-cost preconcentration at high tin recoveries and large mass rejection, prior to downstream
processing, leading to further substantial reductions in potential project CapEx and OpEx.
Diamond drilling program commences:
Diamond drilling to commence this week with five holes planned for a total of ~1,000m.
This diamond drilling program is designed to provide high-quality data to further improve the
Company’s geological understanding of the deposit, vital to upgrade the MRE at Tallebung
and provide the basis for ongoing mining and development studies.
Large-scale RC drilling program planned to follow this program to significantly expand the
recently identified higher-grade areas and increase the MRE in size, confidence and grade.
SKY METALS LIMITED
+61 2 6360 1587
2 HAWTHORN PLACE, ORANGE NSW 2800
WWW.SKYMETALS.COM.AU
ABN 46 098 952 035
1
In relation to the disclosure of visible mineralisation, the Company cautions that visual estimates of mineral abundance should
never be considered a proxy or substitute for laboratory analyses where concentrations or grades are the factor of principal
economic interest. Visual estimates also potentially provide no information regarding impurities or deleterious physical
properties relevant to valuations. The Company will update the market when laboratory analytical results become available,
expected from late-January 2025.
SKY Managing Director & CEO Oliver Davies commented: “The fact that all six trenches excavated in late 2024
intercepted tin mineralisation at surface is a very encouraging result and gets the Company off to an excellent
start in 2025. The success of the trenching program demonstrates the shallow nature of the tin mineralisation at
Tallebung and also support SKY’s geological and resource modelling process. We are looking forward to receiving
assay results from channel sampling completed within the trenches, which should be available later this month.
“Additionally, the latest metallurgical test results bolster the already terrific results achieved to-date and will now
be further evaluated as a part of the pilot-scale plant testwork in the imminent bulk sampling program.
“This is all part of the large work program that SKY is undertaking this year, starting with the diamond drilling
program beginning this week and continuing into the bulk sampling and metallurgical testwork program and
culminating in a large resource expansion drilling program over the coming months. This exciting work program is
building towards mining and development studies to show the potential project economics of the Tallebung Tin
Project, expected to be released following the results of this ongoing work program, around the middle of this
year.”
Sky Metals Ltd (ASX: SKY) (‘SKY’ or the ‘Company’) is pleased to advise that multiple workstreams are gathering
momentum to advance its flagship 100%-owned Tallebung Tin Project in central NSW towards development.
The Company has successfully completed the trenching sampling program announced before Christmas in
preparation for bulk metallurgical testwork and MRE validation, with assays from channel sampling awaited. SKY
is also pleased to provide an update on the progress of metallurgical studies and the imminent commencement of
a diamond drilling program.
TALLEBUNG PROJECT (EL 6699, SKY 100%)
TRENCHING AND BULK SAMPLING PROGRAM
Six (6) trenches were completed for total of approximately 201m of trenching. The trenching sites were selected
to traverse zones across the entire footprint of the currently defined extent of the Tallebung tin mineralisation.
All six trenches intercepted quartz veining hosting tin mineralisation (observed in the tin mineral cassiterite). The
sites where trenching was completed are shown in Figure 1 and Figure 2 shows an example of the trenching,
observed tin mineralisation (detailed in table 3 & 4) and sampling.
Trenches were excavated to a depth of between 0.5m to 1m to provide excellent exposures for geological logging,
mapping and sampling, while also ensuring the removal of any transport material that may variably obscure the
shallow tin mineralisation. Once the trenches were excavated, they were cleaned to further improve the exposure
before then being channel sampled in 1m intervals or extended intervals where the geology determined that was
more appropriate.
The sites were selected where previous drilling at Tallebung intersected mineralisation coming close to the
surface, and the trenches were completed in an east-southeast – west-northwest orientation to run perpendicular
to the strike of the mineralisation.
2
All trenches have been geologically logged, mapped and channel sampled. All samples have been submitted to
the assay lab to obtain trench assays which will continue to increase the geological understanding at Tallebung.
Figure 1: Plan showing the current boundary of the Tallebung MRE with proposed costean/trenching sites
indicated in red.
Following receipt of the assay results, the Company will incorporate these into the geological model to increase
both the size and confidence in the MRE and 3-4 zones will be selected for bulk sampling.
To mimic mining, the bulk samples will be taken from below these trenches, in a deeper cut underneath and also
perpendicular to the strike of the mineralisation to give representative bulk samples of the Tallebung tin
mineralisation for metallurgical testwork.
Following sampling, the bulk samples will be crushed and sorted via XRT ore sorting at the full-scale ore sorter at
the TOMRA Ore Sorting Test Facility in Sydney. The sorted samples will then be sent to ALS Burnie in Tasmania
for grinding and processing in a pilot-scale gravity plant to produce a tin concentrate.
The tin concentrate from this program will provide sample concentrate to use for marketing purposes and
customer engagement for the tin concentrate to be produced at Tallebung. Given the favourable nature of the tin
mineralisation at Tallebung, it is anticipated that the tin concentrate will be very desirable for downstream markets.
3
Assay results for the trenching channel sampling are anticipate in the next fortnight.
Figure 2: LHS: photo looking down and south-southwest across trench T4, which was completed above drill-hole
TBRC034. The trench is approximately 0.5m deep and 1-1.5m wide. The margins of the trench are demarcated,
along with the channel made for the channel sample and a quartz-cassiterite (tin) vein cross-cutting the trench.
RHS insert shows a closer image of the quartz-cassiterite (tin) vein with the visible cassiterite (tin) being the
black/grey zones within the vein (further details are provided in table 3 & 4).
In relation to the disclosure of visible mineralisation, the Company cautions that visual estimates of mineral
abundance should never be considered a proxy or substitute for laboratory analyses where concentrations or
grades are the factor of principal economic interest. Visual estimates also potentially provide no information
regarding impurities or deleterious physical properties relevant to valuations. The Company will update the market
when laboratory analytical results become available, expected from late-January 2025.
METALLUGICAL TESTWORK – DMS TRIAL
Last year, ore sorting testwork completed by TOMRA Ore Sorting solutions demonstrate an exceptional result
using an aggressive ore sorting method where a substantial increase in tin grade with reasonable recovery of tin
was achieved in less than 2% of the original mass. This showed that most of the tin could be recovered while
rejecting 98% of the sorted mass (Table 1).
While this result shows the potential for greater tin pre-concentration upgrade and mass reduction from TOMRA
ore sorting, the payoff between upgrade and tin recovery requires further optimisation.
4
Table 1: Results for the TOMRA ore sorting testwork. Silver (Ag) shows a strong upgrade and reasonable
recovery with the tin (Sn) in the sorted products, however tungsten (W) appears to be largely upgraded in the
‘Fines’ fraction. NB: The ‘High Recovery’ product includes the ‘High Upgrade’ sorted sample.
Sn
Grade
%
Sample
Head Sample
before sorting
8-32mm High
Upgrade Sort
8-32mm High
Recovery Sort
8-32mm 1st
Sorting Waste
<8mm Fines
(unsorted)
Sn
Sn
Recovery Upgrade
%
x
Ag
Grade
g/t
Ag
Ag
Recovery Upgrade
g/t
x
W
Grade
%
W
Recovery
%
0.10
100
-
10.7
100
-
0.45
100
4.42
82.9
43.9
342
55.3
29.3
0.01
0.0
0.65
91.5
6.4
57.2
76.0
6.4
0.01
0.2
0.01
8.5
0.1
3.0
8.5
0.1
0.07
11.0
0.14
-
-
8.0
-
-
2.04
88.7
To investigate better tin recovery processes with the aggressive ore sorting, a successful Heavy Liquid Separation
(HLS) was completed, which mimics Dense Medium Separation (DMS). This was aimed at providing a solution to
recover the tin lost in the aggressive ore sorting process while still substantially reducing the mass for further
processing. Results are detailed in Table 2 for this testwork and show 75% of the tin lost in the aggressive ore
sorting process can be recovered in 5.7% of the original waste mass in a 1.50% Sn pre-concentrate, rejecting
over 94% of the waste mass.
Table 2: Results for Heavy Liquid trial to mimic DMS to recover tin from the TOMRA ore sorting testwork. Silver
(Ag) again shows a strong upgrade and recovery with the tin (Sn) with poor recovery of tungsten (W).
%
Sn
Grade
%
Sn
Recovery
%
Sn
Upgrade
x
8-32mm
Sorting Waste
100
0.11
100
DMS Product
5.7
1.50
DMS Waste
94.3
0.03
Sample
Mass
g/t
Ag
Recovery
g/t
Ag
Upgrade
x
W
Grade
%
W
Recovery
%
-
19
100
-
0.12
100
74.5
13.6
167
50.0
8.8
0.33
15.3
25.5
0.3
9.3
50.0
0.5
0.11
84.7
Ag Grade
This result represents an excellent solution to recovering the tin lost during the aggressive ore sorting process
while still maintaining a large +90% mass rejection of the total feed. This will be further reviewed and optimised in
the upcoming bulk sampling and metallurgical testwork over the coming months.
In addition to delivering a much higher tin grade, the benefits of ore sorting and mass reduction include:
Reduced CapEx as only a fraction of the sorted mass requires processing and therefore a significantly
smaller and lower cost processing plant can be considered to support any future mining operation;
Reduced Opex through reduced mill throughput, lower processing costs and lower cost bulk-mining
techniques;
Excellent environmental outcomes including:
– A small fraction of the water will be required to produce saleable tin concentrates;
– A small fraction of the power will be required to produce saleable tin concentrates; and
– Reduced mine footprint including smaller waste emplacements such as tailings dams.
5
This sample was from drill-hole TBD012 between 42-92m of PQ half core for a total of 289.2kg which was sent to
TOMRA Ore Sorting Solutions test facility in Castle Hill, Sydney, NSW in July last year. The sample was crushed
to -40mm and sized with -8mm fraction retained separately as a fines sample. The 8-32mm sample was then sorted
via XRT ore sorting to obtain a high tin recovery sorting setting.
The product (tin-bearing) fraction was then sorted again for a high tin upgrade sort, with the goal of recovering as
much tin as possible in as little mass as possible. The waste from this second sort is what has been trialled in the
DMS testwork program, the results of which are detailed above.
DIAMOND DRILLING PROGRAM COMMENCES
A diamond drilling program comprising five holes for a total of approximately 1,000m is due to commence this
week. Diamond drilling is designed to increase the geological understanding of the deposit and to improve
geological models and increase confidence in future upgrades of both the MRE and the Exploration Target.
The program will be completed with orientated HQ core.
Figure 3: Plan showing the current boundary of the existing Tallebung MRE with proposed diamond drillholes
indicated in orange and the current MRE outlines in red as well as the newly discovered higher-grade, shallow
MRE extension zones.
6
Dilling will target areas where higher-grade zones have been discovered on the margins of the latest MRE and
where geological models can be tested to improve confidence prior to the large-scale, resource expansion RC
drilling program planned, which is planned to commence in the coming months.
This announcement is authorised for release by the Board of Sky Metals Limited.
Investors:
Oliver Davies – Managing Director & CEO
+61 (0) 430 359 547
Media:
Nicholas Read – Read Corporate
+61 (0) 419 929 046
JOIN SKY METALS’ INTERACTIVE INVESTOR HUB
Visit skymetals.com.au to interact with Sky Metals’ announcements and updates
About the Tallebung Tin Project - (100% SKY)
Tallebung stands as an open-pit, technology enabled, near-term tin development project. Tallebung is uniquely
placed to provide secure tin supply, to feed irreplaceable and rapidly expanding tin demand, essential in semiconductors, electronics and solar PV technologies.
The Tallebung Tin Project is located at the site of large-scale historical tin mining in central Western NSW
where tin was first discovered in the 1890s. SKY is progressively defining a large-scale hardrock tin resource
with recent higher-grade tin zones discovered on the margins of the known deposit and exceptional
metallurgical performance demonstrated across the entire known deposit.
The shallow, open-pit tin veins combined with the ideal nature of the tin, hosted as large, discrete grains of
simple tin-oxide (cassiterite minerals), all ideally lends itself to low-cost tin production advantages, including
exceptional X-ray based ore sorting performance, demonstrated to upgrade the tin up to 44x, prior to low-cost
gravity separation to produce a saleable tin concentrate.
7
Competent Persons Statement
The information in this report that relates to Exploration Results is based on information compiled by Mr. Oliver
Davies, who is a Member of the Australasian Institute of Geoscientists. Mr. Oliver Davies is an employee and
director of Sky Metals Ltd and has sufficient experience which is 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 in the 2012 Edition of the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and
Ore Reserves.’ Mr. Davies consents to the inclusion in this report of the matters based on his information in the
form and context in which it appears.
Previously Reported Information
The information in this report that references previously reported exploration results is extracted from the
Company’s ASX market announcements released on the date noted in the body of the text where that reference
appears. The previous market announcements are available to view on the Company's website or on the ASX
website (www.asx.com.au). The Company confirms that it is not aware of any new information or data that
materially affects the information included in the original market announcements. The Company confirms that the
form and context in which the Competent Person’s findings are presented have not been materially modified from
the original market announcements.
Disclaimer
This report contains certain forward-looking statements and forecasts, including possible or assumed reserves
and resources, production levels and rates, costs, prices, future performance or potential growth of Sky Metals
Ltd, industry growth or other trend projections. Such statements are not a guarantee of future performance and
involve unknown risks and uncertainties, as well as other factors which are beyond the control of Sky Metals Ltd.
Actual results and developments may differ materially from those expressed or implied by these forward-looking
statements depending on a variety of factors. Nothing in this report should be construed as either an offer to sell
or a solicitation of an offer to buy or sell securities.
This document has been prepared in accordance with the requirements of Australian securities laws, which may
differ from the requirements of United States and other country securities laws. Unless otherwise indicated, all
ore reserve and mineral resource estimates included or incorporated by reference in this document have been,
and will be, prepared in accordance with the JORC classification system of the Australasian Institute of Mining,
and Metallurgy and Australian Institute of Geoscientists.
Table 3: Trench coordinates (MGA94 Zone 55) with start and end with name and length of trench.
TRENCH
ID
START
END
LENGTH
EASTING
NORTHING
RL
EASTING
NORTHING
RL
460832
460726
6376278
6376641
294
283
460855
460760
6376288
6376653
292
281
25
T5
T6
460617
6376449
289
460672
6376461
291
56
T7
460440
6377163
266
460466
6377175
265
28
T8
460500
6376841
287
460529
6376856
288
32
T9
460112
6377204
295
460133
6377211
294
24
T4
8
36
COMMENTS
Table 4: Trench logs for image shown in Figure 2 of trench T6. Mineralisation is vein hosted, and logging is
therefore split into logging of vein volume, number, and minerals for each interval along with any comments.
Logging codes are as follows: Q – Quartz, FEOX – Iron Oxide, CST – Cassiterite. SLST & SDST – Sandstone and
Siltstone, respectively.
TOTAL
VOLUME
% VEINS
TOTAL
NUMBER
VEINS
1
20
1
6
1
10
6
7
1
7
8
1
2
T6
8
9
1
T6
9
10
1
T6
10
11
1
T6
11
12
1
T6
12
13
1
T6
13
14
1
T6
14
34
20
T6
34
35
1
5
1
Q
4
FEOX
1
T6
35
36
1
5
3
Q
4
FEOX
1
T6
36
36.5
0.5
5
2
Q
4
FEOX
1
HOLE
ID
FROM
(m)
TO
(m)
INTERVAL
(m)
T6
0
4
4
T6
4
5
T6
5
T6
T6
VEIN
MIN1
%
VEIN
MIN2
VEIN
MIN2
%
Q
20
CST
0.2
1
Q
10
1
Q
2
VEIN
MIN1
VEIN
MIN3
VEIN
MIN3
%
COMMENTS
Interbedded SLST & SDST
Interbedded SLST & SDST
Interbedded SLST & SDST
Interbedded SLST & SDST
Interbedded SLST & SDST
Interbedded SLST & SDST
2
1
Q
2
Interbedded SLST & SDST
2
1
Q
2
Interbedded SLST & SDST
Interbedded SLST & SDST
Interbedded SLST & SDST
2
2
Q
2
Interbedded SLST & SDST
Interbedded SLST & SDST
SDST hosted qtz feox vein, in
fracts in SDST. SDST steep East
dip
SDST hosted qtz feox vein, in
fracts in SDST. Large SDST bed
possibly folded core of antIform
Part of above
T6
36.5
39.5
3
0.2
3
Q
0.1
FEOX
0.1
T6
39.5
40
0.5
5
2
Q
3
CST
1
T6
40
41
1
T6
41
42
1
T6
42
43
1
T6
43
44
1
3
1
Q
2
FEOX
1
T6
44
45
1
3
1
Q
2
FEOX
1
T6
45
46
1
3
1
Q
2
FEOX
1
T6
46
47
1
T6
47
48
1
2
1
Q
1
FEOX
0.8
CST
0.2
T6
48
49
1
2
1
Q
1
FEOX
0.8
CST
0.2
T6
49
50
1
T6
50
51
1
T6
51
54
3
T6
54
55
1
2
1
Q
1
FEOX
1
T6
55
56
1
2
1
Q
1
FEOX
1
FEOX
1
Fault zone, minor qtz vein in
SDST beds
Thick SDST bed at fract fill qtz
cst feox vein
Interbedded SLST & SDST
8
3
Q
6
CST
1
FEOX
1
Interbedded SLST & SDST, fract
fill qtz cst feox vein in SDST
Interbedded SLST & SDST
Interbedded SLST & SDST, fract
fill qtz cst feox vein in SDST
Interbedded SLST & SDST, fract
fill qtz cst feox vein in SDST
Interbedded SLST & SDST, fract
fill qtz cst feox vein in SDST
Interbedded SLST & SDST
gray SLST-SDST with thick 30cm
SDST bed with fract fill qtz-cstfeox vein
gray SLST-SDST with thick 30cm
SDST bed with fract fill qtz-cstfeox vein
Interbedded SLST & SDST
2
1
Q
1
FEOX
1
interbedded SLST & SDST, minor
qtz-feox vein
Interbedded SLST & SDST
9
interbedded SLST & SDST, minor
qtz vn in SDST
interbedded SLST & SDST, minor
qtz vn in SDST
JORC CODE, 2012 - TABLE 1
Section 1 Sampling Techniques and Data – TALLEBUNG PROJECT
(Criteria in this section apply to all succeeding sections)
Criteria
Explanation
Sampling techniques
Commentary
Drill core sampling is by sawn quarter core PQ & half core HQ core. Nominal sample intervals are 1m with a
Nature and quality of sampling (e.g. cut channels, random chips, or specific specialised
industry standard measurement tools appropriate to the minerals under investigation, such range from 0.3m to 2.0m.
as downhole gamma sondes, or handheld XRF instruments, etc). These examples should not
All samples were submitted to ALS Burnie for preparation and assaying.
be taken as limiting the broad meaning of sampling.
Include reference to measures taken to ensure sample representivity and the appropriate
calibration of any measurement tools or systems used.
For diamond drilling standards are insert every 30-50 samples.
All sample lab received weights show consistency with core recovery and interval length.
Aspects of the determination of mineralisation that are Material to the Public Report. In
cases where ‘industry standard’ work has been done this would be relatively simple (e.g.
‘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 (e.g. submarine nodules) may warrant disclosure of
detailed information.
Each sample was dried, crushed and pulverised as per standard industry practice.
Diamond drilling - core samples were taken at nominally 1m, but with a range between 0.3-2m. PQ core
samples are cut in quarters with ¾ retained for reference and metallurgical test work and ¼ submitted for
assay - dried, crushed and pulverised to 90% passing 75 microns.
ALS Burnie - XRF fusion for Sn, Fe, Si, S, W & Ag as appropriate
Drilling techniques
Drill type (e.g. core, reverse circulation, open-hole hammer, rotary air blast, auger, Bangka, Diamond Drilling completed by drilling PQ.
sonic, etc) and details (e.g. core diameter, triple or standard tube, depth of diamond tails,
face-sampling bit or other type, whether core is oriented and if so, by what method, etc)
PQ core was orientated.
Drill sample recovery
Sample weights are recorded for each sample. Recoveries were generally excellent and consistent, however,
Method of recording and assessing core and chip sample recoveries and results assessed.
if samples were wet the recoveries were less consistent.
Measures taken to maximise sample recovery and ensure representative nature of the
samples.
Whether a relationship exists between sample recovery and grade and whether sample bias There is no known relationship between sample recovery and grade. Where samples recoveries are less than
95% there is no relationship observed between grade and sample recovery. Relationships between sample
may have occurred due to preferential loss/gain of fine/coarse material
recovery and grade are not considered significant where recoveries exceeded 95% in fresh rock.
Logging
Whether core and chip samples have been geologically and geotechnically logged to a level Systematic geological and geotechnical logging was undertaken when the holes were originally drilled. Data
of detail to support appropriate Mineral Resource estimation, mining studies and
collected includes:
metallurgical studies
Nature and extent of lithologies.
Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc)
Relationship between lithologies.
photography
Amount and mode of occurrence of ore minerals.
The total length and percentage of the relevant intersections logged
Location, extent, and nature of structures such as bedding, cleavage, veins, faults etc. Structural
data (alpha & beta) are recorded for orientated core.
Geotechnical data such as recovery, RQD, fracture frequency, qualitative IRS, microfractures, veinlets and
number of defect sets. For some geotechnical holes the orientation, nature of defects and defect fill are
recorded.
10
Criteria
Explanation
Commentary
Both qualitative and quantitative data is collected.
1/4 core (PQ) samples are retained in trays for future reference.
Sub-sampling techniques
and sample preparation
Quality of assay data
and laboratory tests
Verification of sampling
and assaying
½ PQ core was sued for testwork.
If core, whether cut or sawn and whether quarter, half or all core taken
If non-core, whether riffled, tube sampled, rotary split, etc and whether sampled wet or dry
Samples were split and subsequently crushed and milled to p100 -3350um before conducting testwork.
For all sample types, the nature, quality and appropriateness of the sample preparation
technique
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
The nature, quality and appropriateness of the assaying and laboratory procedures used and Standard assay procedures performed by a reputable assay lab, ALS Brunie - XRF fusion for Sn, Fe, Si, S, W &
whether the technique is considered partial or total
Ag as appropriate.
For geophysical tools, spectrometers, handheld XRF instruments, etc, the parameters used in
determining the analysis including instrument make and model, reading times, calibrations No geophysical tools were used in the determination of assay results.
factors applied and their derivation, etc
Certified reference material or blanks were inserted at least every 50 samples in drillng. Standards are
Nature of quality control procedures adopted (e.g. standards, blanks, duplicates, external
laboratory checks) and whether acceptable levels of accuracy (i.e. lack of bias) and precision purchased from Certified Reference Material manufacture companies: Standards were purchased in foil
lined packets of between 60g and 100g. Different reference materials were used to cover high grade,
have been established
medium grade, low grade, and trace ranges of elements, with a primary focus on Sn and W.
The verification of significant intersections by either independent or alternative company
personnel.
The use of twinned holes.
Documentation of primary data, data entry procedures, data verification, data storage
(physical and electronic) protocols.
Discuss any adjustment to assay data
Drill data is compiled and collated and reviewed by senior staff and external consultants. The calculations
were viewed by >1 personnel.
Twinned holes have been used by past explorers to validate the results achieved and have confirmed these
historic results.
Drill Hole Data including: meta data, any gear left in the drill hole, lithological, mineral, survey, sampling,
magnetic susceptibility was collected and stored as physical and electronic copies or entered directly into an
excel spread sheet using drop down codes. When complete the spreadsheet was combined into a master
excel spreadsheet as the drill hole database.
Assay data was provided by ALS Burnie via spreadsheets. The data was validated using the results received
from the known certified reference material. Hard copies of the assay certificates were stored with drill hole
data such as drillers plods, invoices, and hole planning documents.
Assay data is not adjusted.
Location of data points
Accuracy and quality of surveys used to locate drill holes (collar and down-hole surveys),
trenches, mine workings and other locations used in Mineral Resource estimation.
Specification of the grid system used
Quality and adequacy of topographic control
Historic drill hole collars were located using either a licenced surveyor or on a local imperial or metric grid.
Conversion of the local grid co-ordinates has been undertaken by previous exploration companies. SKY has
used DGPS surveying of drillholes (± 0.1m) to accurately locate them.
All coordinates are based on Map Grid Australia Zone 55E, Geodetic Datum of Australia 1994.
Historic drill hole collars were located using either a licenced surveyor or on a local imperial or metric grid.
SKY has used DGPS surveying of drillholes (± 0.1m) to accurately locate them, or handheld GPS (+/-3m).
Where handheld GPS has been used SKY will DGPS them at a later date.
11
Criteria
Data spacing and
distribution
Explanation
Commentary
Data s
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