Strong Assay Results At Kamperman Ahead of Feysville MRE
Released
Released
Announcement PDF
ASX Announcement
2 August 2024
STRONG ASSAYS RESULTS AT KAMPERMAN AHEAD OF
FEYSVILLE RESOURCE UPGRADE
Excellent assay results received from a recently completed in-fill RC program at
Kamperman to support a maiden MRE due in the September Quarter.
HIGHLIGHTS
•
26-hole/2,808 metre reverse circulation (RC) infill and extensional drilling program
completed at the Kamperman Prospect (Feysville Gold Project) with excellent results
from the first 23 holes including:
•
38 metres at 2.12g/t Au from 42 metres in FRC358;
•
34 metres at 2.24g/t Au from 33 metres in FRC353;
•
19 metres at 3.32g/t Au from 32 metres including 1 metre at 32.78g/t Au
from 48 metres in FRC355;
•
18 metres at 1.51g/t Au from 28 metres in FRC343;
•
19 metres at 1.35g/t Au from 25 metres in FRC345;
•
8 metres at 2.40g/t Au from 20 metres in FRC344;
•
11 metres at 1.38g/t Au from 17 metres and 12 metres at 1.99g/t Au from
78 metres in FRC341;
•
3 metres at 5.45g/t Au from 64 metres including 1 metre at 15.15g/t Au from
65 metres in FRC359;
•
13 metres at 1.13g/t Au from 39 metres in FRC336;
•
8 metres at 1.64g/t Au from 35 metres in FRC351;
•
14 metres at 1.16g/t Au from 118 metres in FRC356;
•
11 metres at 1.24g/t Au from 39 metres in FRC348; and
•
4 metres at 3.09 g/t Au from 67 metres in FRC335;
•
In-fill results support the interpretation of a high-grade west-dipping zone of gold
mineralisation extending from north to south over 450 metres of strike.
•
Extensional drilling shows that the mineralisation at Kamperman remains open both
to the north and east.
•
The results will underpin a maiden Mineral Resource Estimate (MRE) for Kamperman,
due in the September Quarter, as part of an updated MRE for the Feysville Gold
Project.
•
Kamperman represents a potential valuable source of high-grade satellite feed for
the Mandilla Process Plant contemplated in the September 2023 Scoping Study 1.
1
Refer to ASX Announcement 21 September 2023 “Mandilla Gold Project – Kalgoorlie, WA. Positive Scoping Study”
Astral Resources’ Managing Director Marc Ducler said: “This 26-hole drill program is
arguably the most successful program completed to date at Kamperman.
“These latest results confirm our geological interpretations with, pleasingly, a broad 30metre-wide zone of consistent +2g/t gold mineralisation defined across multiple sections
in the southern zone at Kamperman.
“Mineral Resource estimate work is now underway at Kamperman following receipt of
these latest results, while the Rogan Josh and Think Big estimations are currently being
finalised.
“The focus is now turning to the Theia Deposit at the Mandilla Gold Project, with the
first phase (6,000 metres) of in-fill RC drilling expected to get underway next week.
“Following the completion of the Phase 1 program, Astral will return to Feysville
following up the significant gold anomalies that were announced earlier this month in
an area to the north-west of Kamperman.”
Astral Resources NL (ASX: AAR) (Astral or the Company) is pleased to report assay results from a
recently completed 26-hole/2,808 metre RC drilling program at the Kamperman Prospect, part of its
100%-owned Feysville Gold Project (Feysville), located approximately 14km south of Kalgoorlie in
Western Australia (Figure 1).
This announcement reports assay results for 23 holes of the 26-hole program. Assay results for the
remaining three holes are pending.
Figure 1 – Map illustrating location of Mandilla and Feysville Gold Projects.
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FEYSVILLE GOLD PROJECT
The Feysville Gold Project is located within the north-north-west trending Norseman – Wiluna
Greenstone Belt, within the Kambalda Domain of the Archean Yilgarn Craton, approximately 14km
south of the KCGM Super Pit in Kalgoorlie.
Significant gold and nickel mineralisation occurs throughout the belt, including world-class deposits
such as the Golden Mile Super Pit in Kalgoorlie owned by Northern Star Resources Limited (ASX: NST)
and the St Ives Gold Mine south of Kambalda owned by Gold Fields Limited. The area also hosts the
substantial Beta Hunt Gold Mine owned by Karora Resources Inc. (TSX: KRR).
Feysville hosts an MRE of 3Mt at 1.3g/t Au for 116koz of contained gold 2 at the Think Big deposit,
providing a foundation for the project to potentially become a source of satellite ore feed to a future
operation based on Astral’s flagship Mandilla Gold Project.
Locally, Feysville has been interpreted to contain upthrust ultramafics, emplaced within a sequence of
volcanic sediments (the Black Flag sediment group), granitic intrusions, mafic basalts, gabbro and
andesite.
A map of the Feysville Gold Project identifying tenements and deposits/prospects on local area
geology is set out in Figure 2.
2
- Feysville JORC 2012 Mineral Resource Estimate: 0.6Mt at 1.1g/t Au for 20.2koz Indicated Mineral Resources and 2.3Mt at 1.3g/t Au for
95.6koz Inferred Mineral Resources (refer to ASX Announcement dated 8 April 2019).
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14km to the
92Moz NST
Super Pit
10km to the
+3Moz
South Kalgoorlie Operation
Figure 2 – Map of Feysville Gold Project showing tenements and deposits/ prospects on local area geology.
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FEYSVILLE EXPLORATION UPDATE
On 26 June 2024, Astral commenced a 26-hole RC drill program at Kamperman, where gold
mineralisation has previously been delineated through RC drilling over a strike length of 450 metres.
The primary purpose of this latest program was to reduce drill spacing to a 40 by 20 metre pattern.
Several extensional holes, stepping out to the east on existing drilling lines, were also undertaken.
The collar locations for the 26-hole drill program are set out in Figure 3.
Figure 3 – Aerial image illustrating location of drill collars from latest RC program.
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KAMPERMAN REVERSE CIRCULATION DRILLING RESULTS
Of the 26 holes drilled in the latest program, assay results have to date been received for 23 holes.
In respect of these 23 holes, 14 were drilled as in-fill tests and nine were drilled as 20-metre up-dip
steps within the current strike extent of Kamperman.
Of the 23 holes, 20 returned significant gold mineralisation (greater than five gram-metres 3).
Best results include:
•
•
•
•
•
•
•
•
•
•
•
•
•
38 metres at 2.12g/t Au from 42 metres in FRC358;
34 metres at 2.24g/t Au from 33 metres in FRC353;
19 metres at 3.32g/t Au from 32 metres including 1 metre at 32.78g/t Au from 48 metres
in FRC355;
18 metres at 1.51g/t Au from 28 metres in FRC343;
19 metres at 1.35g/t Au from 25 metres in FRC345;
8 metres at 2.40g/t Au from 20 metres in FRC344;
11 metres at 1.38g/t Au from 17 metres and 12 metres at 1.99g/t Au from 78 metres in
FRC341;
3 metres at 5.45g/t Au from 64 metres including 1 metre at 15.15g/t Au from 65 metres
in FRC359;
13 metres at 1.13g/t Au from 39 metres in FRC336;
8 metres at 1.64g/t Au from 35 metres in FRC351;
14 metres at 1.16g/t Au from 118 metres in FRC356;
11 metres at 1.24g/t Au from 39 metres in FRC348; and
4 metres at 3.09 g/t Au from 67 metres in FRC335;
Towards the southern limit of known mineralisation at Kamperman, FRC355 was an in-fill hole planned
to intersect a steeply west-dipping zone of gold mineralisation characterised by strong magnetite and
sulphide mineralisation, coincident with a mafic unit. The hole returned 19 metres at 3.32g/t Au from
32 metres.
To the west along the same drill line, hole FRC356 in-filled below the previously drilled FRC240,
assaying 14 metres at 1.16g/t Au from 118 metres.
A cross-section along this drill line is set out in Figure 4.
3
Gram-metres or GxM is the product of the assayed grade of the reported interval multiplied by the length of the reported
interval.
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Figure 4 – Cross-section through Kamperman illustrating hole location, assay results and geological interpretation (refer
Figure 3 for section location).
As illustrated, at this location, a broad (typically 30-metres wide) zone of mineralisation, generally >2
g/t Au, is present, extending from a shallow depth, approximately 30 metres below surface, and
representing the top-of-saprock horizon.
With cross-sections through parallel drill lines to the south of Kamperman illustrating mineralised
zones of broadly similar shape, this bodes well for the presence of a consistent zone of mineralisation
from a shallow depth that will be easily accessible during mining.
Towards the northern limit of known mineralisation at Kamperman, three holes were drilled in the
latest program, FRC336 and, FRC337 as in-fill tests, and FRC335 as a 20 metre eastward up-dip test.
Best assay results from these holes include:
•
•
•
4 metres at 3.09g/t Au from 67m in FRC335;
13 metres at 1.13g/t Au from 39 metres in FRC336; and
9 metres at 0.74g/t Au from 89 metres in FRC337.
A cross-section along this drill line is set out in Figure 5.
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Figure 5 – Cross-section through Kamperman illustrating hole location, assay results and geological interpretation (refer
Figure 3 for section location).
As illustrated, the gold mineralisation at this location to the north of Kamperman is quite different to
that which is present to the south (illustrated above).
Here, mineralisation is associated with quartz veining and pyrite hosted in feldspar porphyry, with high
grade gold occurring on sheared contacts with ultramafic units, forming a moderate to shallow westdipping mineralised zone.
That said, a flat-lying shallow zone of supergene related gold mineralisation is present in the north and
seems consistent along the strike.
The abrupt change in the nature of the gold mineralisation at Kamperman along strike from the north
to the south suggests the presence of a fault which may offset the mineralisation.
This is evidenced not only by this observed change in the nature of the gold mineralisation but also
supported by way of borehole litho-geochemistry, regional geophysics and drill-hole logging data.
Elsewhere, holes FRC338 and FRC344 were drilled as up-dip eastward step-outs along drill lines. Best
assay results include:
•
•
8 metres at 2.40g/t Au from 20 metres in FRC344; and
16 metres at 0.77g/t Au from 14 metres in FRC338.
Drill-holes FRC341, FRC343, FRC345, FRC353, FRC358 and FRC359 were drilled to test the continuity
of a west-dipping ore body.
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Best assay result include:
•
•
•
•
•
•
•
38 metres at 2.12g/t Au from 42 metres including 1 metre at 9.08g/t Au from 49 metres
in FRC358;
34 metres at 2.24g/t Au from 33 metres in FRC353;
19 metres at 3.32g/t Au from 32 metres including 1 metre at 32.78g/t Au from 48 metres
in FRC355;
18 metres at 1.51g/t Au from 28 metres in FRC343;
19 metres at 1.35g/t Au from 25 metres in FRC345;
12 metres at 1.99g/t Au from 78 metres in FRC341; and
3 metres at 5.45g/t Au from 64 metres including 1 metre at 15.15g/t Au from 65 metres
in FRC359.
The continuity of a west-dipping ore body was, indeed, confirmed through these results.
In summary, the recent RC drill program at Kamperman has demonstrated the continuity of gold
mineralisation and robustness of the current geological interpretations along 450 metres of strike at
Kamperman.
This augurs well for the forthcoming maiden MRE at Kamperman, work on which has already
commenced, and which is due to be completed in the September Quarter.
Notwithstanding the above, the Kamperman Prospect warrants further drilling, not only to better
understand the controls to gold mineralisation along the known strike length but also to extend
mineralisation where it remains open, being to the north, east and at depth.
EXPLORATION UPDATE
A 6,000 metre RC program is scheduled to begin at Theia on 5 August to advance the Mandilla Gold
Project.
This new program is the first of three phases of drilling totalling 14,000 metres which are designed to
upgrade the Inferred Mineral Resources within the Stage 1 and Stage 2 Theia open pit designs
envisaged in the Scoping Study completed in September 20231.
APPROVED FOR RELEASE
This announcement has been approved for release by the Managing Director.
For further information:
Investors:
Marc Ducler
Managing Director
Astral Resources
+61 8 9382 8822
ASTRAL RESOURCES NL
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Media:
Nicholas Read
Read Corporate
+61 419 929 046
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Compliance Statement
The information in this announcement that relates to exploration targets and exploration results is based on, and
fairly represents, information and supporting documentation compiled by Ms Julie Reid, who is a full‐time
employee of Astral Resources NL. Ms Reid is a Competent Person and a Member of The Australasian Institute of
Mining and Metallurgy. Ms Reid 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’. Ms Reid consents to the inclusion in this announcement of the material based on this information, in
the form and context in which it appears.
The information in this announcement that relates to Estimation and Reporting of Mineral Resources for the
Feysville Gold Project is based on information compiled by Mr Richard Maddocks, who is a Fellow of the
Australasian Institute of Mining and Metallurgy (FAusIMM). Mr Maddocks is an independent consultant to the
Company. Mr Maddocks has sufficient experience that 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 Maddocks consents to the inclusion in this announcement of the matters based on the
information in the form and context in which it appears.
Previously Reported Results
There is information in this announcement relating to exploration results which were previously announced on
31 January 2017, 19 June 2020, 11 August 2020, 15 September 2020, 17 February 2021, 26 March 2021, 20 April
2021, 20 May 2021, 29 July 2021, 26 August 2021, 27 September 2021, 6 October 2021, 3 November 2021, 15
December 2021, 22 February 2022, 3 May 2022, 6 June 2022, 5 July 2022, 13 July 2022, 10 August 2022, 23
August 2022, 21 September 2022, 13 October 2022, 3 November 2022, 30 November 2022, 15 March 2023, 12
April 2023, 24 April 2023, 16 May 2023, 14 June 2023, 3 July 2023, 30 August 2023, 5 September 2023, 18
September 2023, 8 November 2023, 22 November 2023, 21 December 2023, 18 January 2024, 30 January 2024,
28 February 2024, 6 March 2024, 4 April 2024, 4 June 2024, 11 July 2024 and 25 July 2024. Other than as disclosed
in those announcements, 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 information in this announcement relating to the Company's Scoping Study are extracted from the Company's
announcement on 21 September 2023 titled “Mandilla Gold Project – Kalgoorlie, WA. Positive Scoping Study”. All
material assumptions and technical parameters underpinning the Company's Scoping Study results referred to in
this announcement continue to apply and have not materially changed. 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.
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Appendix 1 – Drill Hole Details
Hole ID
Type
Table 1 – Drill hole data
Hole Depth
(m)
GDA (North)
GDA (East)
GDA RL
Dip
MGA Azmith
FRC335
RC
90
6,577,296
364,810
331.5
60
90
FRC336
RC
78
6,577,296
364,790
330.2
60
90
FRC337
RC
116
6,577,298
364,724
329.1
60
90
FRC338
RC
86
6,577,258
364,787
333.0
60
90
FRC339
RC
98
6,577,258
364,727
332.6
60
90
FRC340
RC
92
6,577,219
364,798
334.9
60
90
FRC341
RC
152
6,577,219
364,735
333.7
60
90
FRC342
RC
80
6,577,197
364,774
334.9
60
90
FRC343
RC
80
6,577,197
364,754
334.3
60
90
FRC344
RC
74
6,577,176
364,781
335.3
60
90
FRC345
RC
74
6,577,158
364,778
333.1
60
90
FRC346
RC
98
6,577,136
364,755
332.0
60
90
FRC347
RC
116
6,577,136
364,735
332.9
60
90
FRC348
RC
152
6,577,136
364,715
332.0
60
90
FRC349
RC
116
6,577,084
364,755
336.2
60
90
FRC350
RC
140
6,577,084
364,715
333.4
60
90
FRC351
RC
116
6,577,067
364,737
333.7
60
90
FRC352
RC
62
6,577,042
364,745
334.0
60
90
FRC353
RC
92
6,577,042
364,711
332.0
60
90
FRC354
RC
150
6,577,035
364,668
334.2
60
90
FRC355
RC
86
6,577,018
364,726
332.7
60
90
FRC356
RC
164
6,577,018
364,663
335.2
60
90
FRC357
RC
62
6,576,976
364,751
326.8
60
90
FRC358
RC
116
6,576,977
364,711
330.1
60
90
FRC359
RC
120
6,576,940
364,713
334.0
60
90
FRC360
RC
198
6,576,976
364,671
334.1
60
90
Table 2 – Drilling intersections
Hole ID
FRC335
FRC336
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Location
Kamperman
Kamperman
From (m)
To (m)
Length (m)
Grade g/t
Au
18.0
26.0
8.0
0.34
37.0
46.0
9.0
0.55
67.0
71.0
4.0
3.09
18.0
25.0
7.0
0.63
31.0
35.0
4.0
0.62
39.0
52.0
13.0
1.13
FRC337
Kamperman
17.0
25.0
8.0
0.58
FRC337
Kamperman
32.0
36.0
4.0
0.56
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FRC338
FRC339
FRC340
FRC341
FRC342
FRC343
FRC344
FRC345
FRC346
FRC347
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Kamperman
Kamperman
Kamperman
Kamperman
Kamperman
Kamperman
Kamperman
Kamperman
Kamperman
Kamperman
astralresources.com.au
66.0
67.0
1.0
0.60
71.0
73.0
2.0
0.28
89.0
98.0
9.0
0.74
105.0
107.0
2.0
0.34
14.0
30.0
16.0
0.77
59.0
62.0
3.0
0.82
81.0
82.0
1.0
0.67
11.0
12.0
1.0
0.59
22.0
35.0
13.0
0.55
52.0
56.0
4.0
1.30
73.0
74.0
1.0
0.68
90.0
92.0
2.0
0.27
19.0
20.0
1.0
1.25
82.0
83.0
1.0
0.34
17.0
28.0
11.0
1.38
32.0
40.0
8.0
0.31
42.0
44.0
2.0
0.37
59.0
60.0
1.0
0.37
65.0
73.0
8.0
1.17
78.0
90.0
12.0
1.99
97.0
98.0
1.0
0.6
106.0
108.0
2.0
0.34
111.0
112.0
1.0
0.83
140.0
143.0
3.0
1.72
147.0
150.0
3.0
1.28
18.0
19.0
1.0
0.51
22.0
33.0
11.0
0.62
25.0
26.0
1.0
0.40
28.0
46.0
18.0
1.51
53.0
54.0
1.0
0.38
20.0
28.0
8.0
2.40
32.0
44.0
12.0
0.48
66.0
67.0
1.0
0.70
25.0
44.0
19.0
1.35
68.0
71.0
3.0
0.23
35.0
44.0
9.0
0.91
47.0
56.0
9.0
0.5
75.0
79.0
4.0
0.90
90.0
91.0
1.0
0.61
13.0
14.0
1.0
0.41
26.0
27.0
1.0
3.74
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FRC348
FRC351
Kamperman
Kamperman
33.0
45.0
12.0
0.68
67.0
69.0
2.0
0.36
75.0
78.0
3.0
1.99
90
93
3.0
0.31
115
116
1.0
0.78
39
50
11.0
1.24
55
57
2.0
0.57
85
86
1.0
0.36
110
113
3.0
0.22
133
134
1.0
0.37
141
143
2.0
0.64
35
43
8.0
1.64
88
89
1.0
0.33
FRC352
Kamperman
37
44
7.0
0.58
FRC353
Kamperman
29
30
1.0
4.63
33
67
34.0
2.24
88
90
2.0
2.65
31
33
2.0
0.52
66
69
3.0
0.85
102
114
12.0
0.58
119
120
1.0
1.09
125
126
1.0
1.37
32
51
19.0
3.32
FRC354
FRC355
Kamperman
Kamperman
Includes 1 metre at 32.78g/t Au from 48 metres
FRC356
FRC357
FRC358
FRC359
FRC359
Kamperman
Kamperman
Kamperman
Kamperman
Kamperman
26
30
4.0
1.04
105
107
2.0
0.83
118
132
14.0
1.16
138
149
11.0
0.81
26
28
2.0
0.91
30
32
2.0
0.40
38
40
2.0
0.31
35
37
2.0
0.45
42
80
38.0
2.12
87
89
2.0
1.23
91
93
2.0
0.36
32
33
1.0
0.90
42
44
2.0
0.34
64
67
3.0
5.45
Includes 1 metre at 15.15g/t Au from 64 metres
96
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1.0
1.32
13
Appendix 2 – JORC 2012 Table 1
Feysville
Criteria
Sampling techniques
Section 1 – Sampling Techniques and Data
JORC Code Explanation
Commentary
• Nature and quality of sampling (e.g. cut channels,
The project has been sampled using industry standard drilling
random chips, or specific specialised industry
techniques including diamond drilling (DD), and reverse circulation (RC)
standard measurement tools appropriate to the
drilling and air-core (AC) drilling.
minerals under investigation, such as down hole
The sampling described in this release has been carried out on the 2024
gamma sondes, or handheld XRF instruments,
AC and RC drilling.
etc.). These examples should not be taken as
limiting the broad meaning of sampling.
The RC holes were drilled and sampled. The samples are collected at
• Include reference to measures taken to ensure
1m intervals via a cyclone and splitter system and logged geologically.
sample representivity and the appropriate
A four-and-a-half-inch RC hammer bit was used ensuring plus 20kg of
calibration of any measurement tools or systems
sample collected per metre.
used.
All RC samples were collected in bulka bags in the AAR compound and
trucked weekly to ALS in Kalgoorlie via Hannans Transport. All samples
• Aspects of the determination of mineralisation
transported were submitted for analysis. Transported material of
that are Material to the Public Report. In cases
varying thickness throughout project was generally selectively sampled
where ‘industry standard’ work has been done
only where a paleochannel was evident.
this would be relatively simple (e.g. ‘reverse
circulation drilling was used to obtain 1 m
All samples were assayed by ALS with company standards blanks and
samples from which 3 kg was pulverised to
duplicates inserted at 25 metre intervals.
produce a 30 g charge for fire assay’). In other
cases more explanation may be required, such
Historical - The historic data has been gathered by a number of owners
as where there is coarse gold that has inherent
since the 1980s. There is a lack of detailed information available
sampling problems. Unusual commodities or
pertaining to the equipment used, sample techniques, sample sizes,
mineralisation types (e.g. submarine nodules)
sample preparation and assaying methods used to generate these data
may warrant disclosure of detailed information.
sets. Down hole surveying of the drilling where documented has been
undertaken using Eastman single shot cameras (in some of the historic
drilling) and magnetic multi-shot tools and gyroscopic instrumentation.
All Reverse Circulation (RC) drill samples were laid out in 1 metre
increments and a representative 500 – 700 gram spear sample was
collected from each pile and composited into a single sample every 4
metres. Average weight 2.5 – 3 kg sample. All Aircore samples were
laid out in 1 metre increments and a representative 500 – 700 gram
spear sample was collected from each pile and composited into a single
sample every 4 metres. Average weight 2.5 – 3 kg sample. 1m samples
were then collected from those composites assaying above 0.2g/t Au.
Drilling techniques
Drill sample recovery
• Drill type (e.g. core, reverse circulation, openhole hammer, rotary air blast, auger, Bangka,
sonic, etc) and details (e.g. core diameter, triple
or standard tube, depth of diamond tails, facesampling bit or other type, whether core is
oriented and if so, by what method, etc).
• Method of recording and assessing core and chip
sample recoveries and results assessed.
• 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
may have occurred due to preferential loss/gain
of fine/coarse material.
All RC holes were drilled using face sampling hammer reverse circulation
technique with a four-and-a-half inch bit.
Definitive studies on RC recovery at Feysville have not been undertaken
systematically, however the combined weight of the sample reject and the
sample collected indicated recoveries in the high nineties percentage
range. Poor recoveries are recorded in the relevant sample sheet.
No assessment has been made of the relationship between recovery and
grade. Except for the top of the hole, while collaring there is no evidence
of excessive loss of material and at this stage no information is available
regarding possible bias due to sample loss.
RC: RC face-sample bits and dust suppression were used to minimise
sample loss. Drilling airlifted the water column above the bottom of the
hole to ensure dry sampling. RC samples are collected through a cyclone
and cone splitter, the rejects deposited on the ground, and the samples
for the lab collected to a total mass optimised for photon assay (2.5 to 4
kg).
Poor recoveries are recorded in the relevant sample sheet.
ASTRAL RESOURCES NL
ACN 009 159 077
astralresources.com.au
ASX: AAR
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Logging
Sub-sampling
techniques
and
sample preparation
• 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.
• Whether logging is qualitative or quantitative in
nature.
Core (or costean, channel, etc)
photography.
• The total length and percentage of the relevant
intersections logged.
• 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.
• For all sample types, the nature, quality and
appropriateness of the sample preparation
technique.
• Quality control procedures adopted for all subsampling 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 data
and laboratory tests
ASTRAL RESOURCES NL
ACN 009 159 077
• The nature, quality and appropriateness of the
assaying and laboratory procedures used and
whether the technique is considered partial or
total.
• For geophysical tools, spectrometers, handheld
XRF instruments, etc, the parameters used in
determining the analysis including instrument
make and model, reading times, calibrations
factors applied and their derivation, etc.
• 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
have been established.
astralresources.com.au
All chips and drill core were geologically logged by company geologists,
using their current company logging scheme. The majority of holes
(80%+) within the mineralised intervals have lithology information which
has provided sufficient detail to enable reliable interpretation of
wireframe.
The logging is qualitative in nature, describing oxidation state, grain
size, an assignment of lithology code and stratigraphy code by
geological interval.
RC: Logging of RC chips records lithology, mineralogy, mineralisation,
weathering, colour and other features of the samples. All samples are
wet-sieved and stored in a chip tray.
RC holes were drilled and sampled. The samples are collected at 1m
intervals via a cyclone and splitter system and logged geologically. A fourand-a-half inch RC hammer bit was used ensuring plus 20kg of sample
collected per metre.
Wet samples are noted on logs and sample sheets.
Historical - The RC drill samples were laid out in one metre intervals.
Spear samples were taken and composited for analysis as described
above. Representative samples from each 1m interval were collected and
retained as described above. No documentation of the sampling of RC
chips is available for the Historical Exploration drilling.
Recent RC drilling collects 1 metre RC drill samples that are channelled
through a rotary cone-splitter, installed directly below a rig mounted
cyclone, and an average 2-3 kg sample is collected in pre-numbered
calico bags, and positioned on top of the rejects cone. Wet samples are
noted on logs and sample sheets.
Standard Western Australian sampling techniques applied. There has
been no statistical work carried out at this stage.
ALS assay standards, blanks and checks were inserted at regular
intervals. Standards, company blanks and duplicates were inserted at 25
metre intervals.
RC: 1 metre RC samples are split on the rig using a cone-splitter, mounted
directly under the cyclone. Samples are collected to 2.5 to 4kg which is
optimised for photon assay.
Sample sizes are appropriate to the grain size of the material being
sampled.
Unable to comment on the appropriateness of sample sizes to grain size
on historical data as no petrographic studies have been undertaken.
Sample sizes are considered appropriate to give an indication of
mineralisation given the particle size and the preference to keep the
sample weight below a targeted 4kg mass which is the optimal weight to
ensure representivity for photon assay. There has been no statistical work
carried out at this stage.
Photon Assay technique at ALS, Kalgoorlie.
Samples submitted for analysis via Photon assay technique were dried,
crushed to nominal 90% passing 3.15mm, rotary split and a nominal
~500g sub sample taken (AC/RC Chips method code CRU-32a & SPL32a, DD core method codes CRU-42a & SPL-32a)
The ~500g sample is assayed for gold by PhotonAssay (method code AuPA01) along with quality control samples including certified reference
materials, blanks and sample duplicates.
The ALS Phot
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