Significant Porphyry Copper Gold Targets at Commonwealth
Released
Released
Announcement PDF
ASX ANNOUNCEMENT
Date: 23rd April 2020
Number: 671/230420
SIGNIFICANT PORPHYRY COPPER GOLD TARGETS CONFIRMED AT
THE COMMONWEALTH PROJECT
NEAR THE BODA DISCOVERY IN NEW SOUTH WALES
Follow up work to commence in May
•
New rock chip assay data demonstrates that many of the crucial fundamental
geochemical components required to form a large porphyry copper-gold deposit are
present at the Apsley and Spicers Creek Prospects, in particular:
o Extensive areas of Ordovician aged shoshonite and related high potassium rocks;
key components to the major porphyry copper gold deposits at Cadia Ridgeway
and North Parkes as well as the host rocks at Boda.
o Copper grades increasing in more shoshonitic rocks as seen in major deposits
globally.
o Extensive areas of copper+/-gold mineralisation over several square kilometres at
both prospects with up to 8% copper at Apsley and 14.4% copper and 6.8 g/t gold
at Spicers Creek.
o Pathfinder metal and alteration mineral assemblages that suggest the prospects lie
within the outer (propylitic) to middle-inner (potassic) zones of porphyry coppergold systems, the prospective centres of which may lie only within a few hundred
metres of the areas sampled, either at depth or along trend.
o A spatial association with magnetic anomalies that are unexplained and which,
like Boda, could be a direct indication of significant copper-gold mineralisation.
•
Follow up airborne magnetic and radiometric geophysical surveys and soil geochemistry
programmes will commence in May to help define specific targets for drilling.
Impact Minerals Limited Managing Director Dr Mike Jones said:
“These new rock chip assays have confirmed and significantly enhanced our belief that our extensive
ground holdings in the Lachlan Fold Belt have the potential to host a major porphyry copper-gold
deposit. The data shows two of our key targets have all the hallmarks of a large mineralised system:
extensive copper and other metals at surface in rocks of the same age and same geochemistry as those
that host the world class deposits at Cadia-Ridgeway and North Parkes.
“In addition, the rocks show extensive classic patterns of pathfinder metal and alteration mineral
assemblages seen around those deposits. It is incredible that there is no drilling at either prospect and
we are looking forward to identifying specific drill targets after our follow up airborne and soil
geochemistry surveys which will start in May” he said.
The significant exploration potential for large porphyry copper-gold deposits at two prospects at
Impact Minerals Limited’s (ASX:IPT) 100% owned Commonwealth project in the Lachlan Fold Belt
copper-gold province in New South Wales has been confirmed and enhanced by new assay results
from 49 rock chip samples taken (Figure 1).
The two prospects, Apsley and Spicers Creek, were identified by Impact from work prompted by the
recent major porphyry copper-gold discovery at Boda by Alkane Resources Limited (ASX:ALK)
(Figure 2 this report, and ASX ALK Releases 9th September 2019 and 23rd March 2020). Three other
priority areas have also been identified by Impact and new rock chip assays from these are currently
being interpreted (Figure 2 and IPT ASX Releases 22nd November 2019 and 14th January 2020).
At Boda, which lies immediately along trend from Impact’s tenements, a significant drill intercept of
1,167 metres at 0.55 g/t gold and 0.25% copper including a higher grade “core” of 96.8 metres at
4 g/t gold and 1.5% copper was recently reported (ALK ASX Release 23rd March 2020).
The Boda deposit is currently about 400 metres wide (true width), shows strong zonation of metals
and alteration minerals with higher grade copper-gold associated with magnetite in so called skarnrelated alteration. The magnetite can be identified as an anomaly in regional magnetic data
(ALK ASX Release 23rd March 2020).
In addition, Alkane has shown that Boda is hosted by rocks of a specific high potassium alkaline
geochemistry called shoshonites. Importantly these are of the same chemistry and age (Ordovician) as
the host rocks at Cadia-Ridgeway and North Parkes (Figure 1) and are generally accepted as crucial
components to the formation of giant porphyry copper-gold deposits globally.
Figure 1. Location of Impact’s Commonwealth, Pine Hill and Day Dawn Projects covering about
900 km2 of the Lachlan Fold Belt of NSW, home to many significant gold and copper mines.
Figure 2. Priority prospects for follow up work and geology of the Commonwealth Project. Note the location of
the Boda-Kaiser prospects (Alkane Resources) and the Lady Ilse prospect (Magmatic Resources Limited) where
drilling is in progress.
ORDOVICIAN COPPER-BEARING SHOSHONITES AT APSLEY AND SPICERS CREEK
The new rock chip data and maps from the Geological Survey of New South Wales confirm that there
are extensive areas of copper-rich shoshonite and related high potassium rocks of Ordovician age at
both the Apsley and Spicers Creek prospects (Figure 3).
In addition, standard element ratio plots show that the shoshonites are also part of an igneous
differentiation trend in which the rocks become more potassic (K2O-bearing) and, very importantly,
more copper-rich as they evolve towards shoshonite compositions (Figure 3).
Furthermore, both prospects also have extensive areas of copper+/-gold mineralisation as well as
important pathfinder metal assemblages and alteration mineral assemblages typical of porphyry copper
gold systems as described separately for each prospect below.
These features constitute a major breakthrough for Impact as it indicates that many of the crucial
fundamental components required to form a large porphyry copper-gold deposit are present at both
prospects.
Figure 3. Major element ratio plot for Apsley (squares) and Spicers Creek (circles) with copper results
coloured by grade. An igneous differentiation trend towards copper-bearing high potassium and shoshonite
rocks is evident; a common feature to major porphyry copper deposits in the Lachlan Fold Belt. Copper-rich
shoshonite from Apsley (Sample AP06 see ASX Release 14th January 2020).
APSLEY
A highly prospective target zone of about 2 square kilometres in size that has not been previously
drilled has now been identified at Apsley.
Impact’s work indicates that a major copper mineralised system is present at the prospect, potentially
sourced from a buried porphyry intrusion with high grade copper-gold mineralisation that lies within a
few hundred metres from surface (Figure 4).
Figure 4. Airborne magnetic image (RTP 2VD) of the Apsley Prospect with copper assay results, interpreted
alteration zones and possible parent intrusion at depth. The anomalous copper samples are adjacent to the
magnetic anomalies which may represent skarn mineralisation.
Warmer colours on the image represent stronger magnetic responses.
Key features identified at Apsley by Impact include:
1. Widespread and abundant copper oxides and fresh copper sulphides (malachite, azurite,
chalcopyrite and bornite) occur over at least a 2 square kilometre sized area with rock chip
assays of up to 7.7% copper and 23 g/t silver with associated anomalous molybdenum,
tellurium, tungsten and gold in places (Figure 4 and Table 1).
2. The alteration mineral and pathfinder metal assemblages are mostly typical of the outer distal
zones of porphyry copper systems (Figure 5: chlorite-albite (propylitic) alteration with
pathfinder metal assemblages of Tl-Li-Sb-As and Cu-Bi-Te-Se). Copper is widespread in the
outer zones of many porphyry copper gold deposits, for example North Parkes.
3. Higher grade copper assays occur in focussed zones of more proximal sericite-potassic altered
shoshonites and related high potassium rocks. These zones are interpreted to lie along faults
that have tapped a mineralised intrusion at depth (Figures 4 and 5).
4. The entire area of extensive copper mineralisation is associated with several significant
magnetic anomalies which may represent skarn assemblages directly associated with higher
grade mineralisation at depth.
Figure 5. Industry-standard Feldspar-Sodium (Na)-Potassium (K) General Element Ratio plots showing
alteration minerals (left) and the same samples coloured by copper results (right) for Apsley (squares) and
Spicers Creek (circles). A clear trend of increasing copper towards more proximal inner alteration assemblages
is very evident and consistent with being related to significant porphyry copper-gold systems (note the two
prospects are many kilometres apart and thus two separate systems are present ).
GEOCHEMICAL EXPLORATION FOR PORPHYRY COPPER-GOLD DEPOSITS
A key driver in the exploration for large porphyry copper-gold deposits is to develop an understanding of the nature and
distribution of the distinct zones of commodity metals, pathfinder metals and associated alteration minerals that form
around such deposits in order to provide vectors to the high grade cores.
The zones, which are well understood in the scientific literature, vary from outer (distal) zones commonly characterised by
chlorite-albite-epidote (propylitic) alteration and pathfinder metals such as antimony-arsenic-lithium-bismuth-telluriumsilver; to middle-inner zones (proximal) characterised by sericite-K feldspar (potassic) alteration and the pathfinder metals
molybdenum-gold-copper-tungsten-tin.
These zones can be readily identified in industry-standard geochemical graphs such as potassium-aluminium-sodium molar
ratio plots shown here (46 samples in total for Apsley and 23 samples from Spicers Creek. Table 1 and samples from ASX
Release 14th January 2020).
SPICERS CREEK
The Spicers Creek target occurs in the north east of the Commonwealth project and comprises a
number of intriguing magnetic anomalies within Ordovician and Devonian volcanic and intrusive
rocks (Figures 2 and 6).
A highly prospective target zone about 200 metres wide and at least 1,000 metres long has been
identified at the south eastern part of the Spicers Creek prospect which is undrilled (Figure 6).
Figure 6. Image of magnetic data showing rock chip assay results, interpreted alteration zones and underlying
geology at the Spicers Creek prospect. Warm colours in the magnetic image represent zones of stronger
magnetic response.
Key features identified at Spicers Creek by Impact include:
1. Copper oxides and fresh copper sulphides (chalcopyrite, chalcocite, bornite, azurite, and
malachite) occur intermittently over 700 metres of trend within a zone at least 1,000 metres
long and up to 200 metres wide that contains smoky quartz veins within epidote-garnet skarn
altered mafic schists with later cross-cutting porphyry dykes.
One stand-out rock chip sample returned 6.8 g/t gold, 14.4% copper and 83 g/t silver with
strongly elevated molybdenum (46 ppm), bismuth (185 ppm), tellurium (18 ppm) and tungsten
(88 ppm). The other rock chip samples returned values of up to 132 ppb gold, 4.7 g/t silver
and 0.7% copper (Table 1).
2. The alteration mineral assemblages indicate strong moderate to strong sericite alteration of
shoshonite and related rocks and this is associated with the strongest copper results (Figure 5).
The pathfinder metal assemblages of moderately elevated Tl-Li-Sb-As, Bi-Te-Se and Cu-AuBi-Mo is a mix of both outer and inner assemblages. This suggests the alteration zones have
been “telescoped” along a fault that may have tapped a mineralised intrusion at depth or along
trend.
3. The magnetic data indicates the prospect area sampled is coincident with a broad weak linear
magnetic anomaly about 1,000 metres long. Several other much stronger unexplained magnetic
anomalies up to 1,000 metres long occur in the northwest of the prospect area and all of these
are targets for skarn-related mineralisation (Figure 6). Further work along trend to the north
west is required.
NEXT STEPS
These results strongly support the potential for Apsley and Spicers Creek to host a large porphyry
copper-gold deposit, in particular:
1. Extensive areas of Ordovician aged shoshonite and related rocks;
2. Significant copper and/or gold rock chip assays with associated pathfinder metals;
3. Alteration mineral assemblages that suggest they lie within the outer (propylitic) to middleinner (potassic) zones of large mineralised systems, the prospective centres of which may
lie only within a few hundred metres of the areas sampled, either at depth or along trend;
and
4. A spatial association with magnetic anomalies that are unexplained and which, like Boda,
could be a direct indication of significant copper-gold mineralisation.
This new data has reinforced Impact’s belief that its tenements in the Lachlan Fold Belt are very
prospective for the discovery of a major porphyry copper gold deposit.
Further work will include the following:
1. A detailed airborne magnetic and radiometric geophysical survey at 50 metre line spacing will
commence in May and cover all five priority targets with the aim of better definition of
structures and potential skarn mineralisation. Electrical geophysical techniques will also be
considered at selected target areas at a later date.
2. A soil geochemistry survey programme will be completed over the Apsley target to help define
specific drill targets. This is also planned for May with logistics currently being organised.
Electrical geophysical techniques are also being considered. Follow up work at Spicers Creek
is subject to land access negotiations.
3. Interpretation of rock chip assays from the three other priority prospects identified by Impact:
Boda South, Greenobbys and Gladstone prospects, to continue.
4. Continued compilation of previous work across Impact’s extensive ground holding in the
Lachlan Fold Belt.
At this stage it is anticipated that COVID19 restrictions will not significantly affect the planned work
programmes.
COMPLIANCE STATEMENT
This report contains new Exploration Results for 49 rock chip samples collected by Impact Minerals
Limited.
Dr Michael G Jones
Managing Director
COMPETENT PERSON’S STATEMENT
The review of exploration activities and results contained in this report is based on information compiled by Dr Mike Jones, a
Member of the Australian Institute of Geoscientists. He is a director of the company and works for Impact Minerals Limited.
He has sufficient experience which is relevant to the style of mineralisation and types of deposits 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 (the JORC Code). Mike Jones has
consented to the inclusion in the report of the matters based on his information in the form and context in which it appears.
Table 1. New Rock Chip Assays
Sample ID Prospect
AP15
AP16
AP17
AP18
AP19
AP20
AP21
AP22
AP23
AP24
AP25
AP26
AP27
AP28
AP29
AP30
AP31
AP32
AP33
AP34
AP35
AP36
AP37
AP38
AP39
AP40
AP41
AP42
AP43
AP44
AP45
AP46
SC01
SC02
SC03
SC04
SC05
SC06
SC06A
SC07
SC08
SC09
SC10
SC11
SC12
SC13
SC14
SC15
SC16
BD19
BD20
BD21
BD22
BD23
BD24
BD25
BD26
BD27
Easting
Apsley
684398
Apsley
684397
Apsley
684354
Apsley
684331
Apsley
684384
Apsley
684441
Apsley
683870
Apsley
683873
Apsley
683857
Apsley
683799
Apsley
683797
Apsley
683678
Apsley
683375
Apsley
683424
Apsley
683424
Apsley
683672
Apsley
683672
Apsley
683672
Apsley
683731
Apsley
683731
Apsley
683709
Apsley
683709
Apsley
684219
Apsley
684210
Apsley
684158
Apsley
684150
Apsley
684073
Apsley
684080
Apsley
684074
Apsley
684476
Apsley
684480
Apsley
684486
Spicers Creek 700576
Spicers Creek 700531
Spicers Creek 700500
Spicers Creek 700445
Spicers Creek 700448
Spicers Creek 700414
Spicers Creek 700418
Spicers Creek 700414
Spicers Creek 700367
Spicers Creek 700251
Spicers Creek 700393
Spicers Creek 700483
Spicers Creek 700596
Spicers Creek 700613
Spicers Creek 700592
Spicers Creek 700552
Spicers Creek 700842
Boda South 690652
Boda South 690652
Boda South 690649
Boda South 690458
Boda South 690473
Boda South 690498
Boda South 690134
Boda South 690133
Boda South 689962
Northing Au_ppm Ag_ppm Bi_ppm
6391011
6391008
6391040
6391021
6390936
6390961
6390496
6390499
6390590
6390602
6390601
6390498
6390041
6390166
6390167
6390241
6390241
6390241
6393588
6393564
6393490
6393490
6389654
6389648
6389656
6389656
6389568
6389553
6389550
6391021
6391030
6390897
6410846
6410885
6410998
6410998
6411000
6411069
6411073
6411068
6411121
6411263
6411378
6411258
6411048
6410612
6410324
6410327
6410350
6408121
6408126
6408125
6408088
6408093
6408090
6408047
6408046
6407871
0.0025
0.0025
0.014
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.007
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.0025
0.005
0.014
0.008
0.006
0.007
0.0025
0.005
0.006
0.077
0.008
0.014
0.086
0.064
0.053
6.79
0.021
0.0025
0.005
0.0025
0.0025
0.0025
0.0025
0.132
0.0025
0.0025
0.0025
0.007
0.008
0.0025
0.0025
0.0025
0.0025
0.055
0.0025
0.07
0.04
0.4
1.91
0.04
0.05
0.15
0.04
12.65
0.06
0.05
0.6
0.3
2.66
1.15
1.81
0.16
0.1
0.48
0.11
0.28
0.3
0.05
0.03
0.04
5.41
8.56
20.7
22.9
0.26
0.51
1.03
2.37
0.16
2.35
4.72
1.83
1.16
83.6
0.18
0.24
0.58
0.34
0.07
0.18
0.06
4.2
0.09
0.01
0.03
0.1
0.21
0.02
0.1
0.04
<0.01
0.11
0.04
0.41
0.12
3.76
0.17
0.1
0.1
1.37
0.06
0.08
0.03
0.42
0.11
0.04
0.03
0.42
0.14
0.08
0.03
0.18
0.06
0.02
0.04
0.21
0.1
0.06
0.13
0.26
0.09
0.18
0.02
0.24
0.05
2.46
0.08
16.6
1.06
7.45
6.14
185.5
0.37
1.18
1.63
1.13
0.06
0.06
0.12
32.6
0.59
0.08
0.02
0.01
0.17
0.03
39.9
0.2
0.05
0.02
0.05
Cu_ppm Mo_ppm Te_ppm W_ppm
5.6
13.1
24.8
9610
72.1
57.3
27
127.5
75600
216
26.6
4070
1675
6730
2480
2500
304
571
1905
229
696
772
139
77
67
33300
23400
73300
77200
1370
1885
3900
7380
361
1075
971
5540
1225
14400
222
518
248
385
68.9
76.7
344
150
9.8
28.7
6.3
150.5
298
89
38.8
98.6
16.5
333
88.7
0.87
1.26
2.28
0.94
1.37
0.32
1.03
0.28
1.16
0.16
0.47
0.48
0.72
1.12
1.06
0.53
0.8
0.41
0.78
0.69
1.29
0.96
0.53
0.44
0.59
0.44
0.71
0.42
0.36
0.98
1.75
0.25
1.44
1.06
0.82
0.3
23
1.51
46.6
1.03
2.75
2.11
1.48
0.77
1.51
1.24
4.25
0.99
1.76
2.59
1.06
1.1
0.81
1.73
0.84
0.44
0.72
0.38
<0.05
<0.05
0.14
<0.05
<0.05
<0.05
0.06
<0.05
<0.05
<0.05
<0.05
<0.05
<0.05
<0.05
<0.05
0.05
<0.05
<0.05
<0.05
<0.05
<0.05
<0.05
<0.05
0.08
0.07
0.06
0.81
0.05
<0.05
<0.05
0.07
<0.05
2.94
0.07
0.05
0.08
0.83
0.14
18.25
<0.05
0.06
0.1
0.05
<0.05
<0.05
0.1
2.15
0.05
<0.05
<0.05
0.16
0.12
<0.05
21.3
0.12
<0.05
<0.05
0.06
1.7
0.7
0.5
0.7
0.4
0.9
0.2
0.3
1.2
0.6
0.3
0.1
0.3
0.2
0.3
0.4
0.5
0.3
0.5
0.3
0.4
0.3
0.1
0.2
0.2
0.2
0.3
0.3
0.2
0.5
0.4
0.2
0.9
1.2
4.1
1.9
62
5
88.2
1.9
4.1
1.3
1.1
0.3
0.5
0.9
18.4
4.2
2.4
0.1
0.4
0.8
0.5
0.7
0.5
0.5
0.5
0.4
APPENDIX 1 - SECTION 1 SAMPLING TECHNIQUES AND DATA
Criteria
JORC Code explanation
Sampling techniques
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 as down hole
gamma sondes, or handheld XRF instruments, etc). These examples
should not 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
Drilling techniques
Drill sample recovery
Logging
Commentary
Rock Chip Samples
Rock chip and grab samples were taken from numerous locations through out the prospect areas.
Rock Chip Samples
The purpose of the rock chip samples was to establish the tenor of any mineralisation visible in outcrop. Therefore the samples are
biased towards mineralised samples. This is appropriate for this type of work.
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
Rock Chip Samples
Samples weighing up to several kilograms were taken.
Drill type (e.g. core, reverse circulation, open-hole hammer, rotary
air blast, auger, Bangka, 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).
N/A
Method of recording and assessing core and chip sample recoveries
and results assessed
N/A
Measures taken to maximise sample recovery and ensure
representative nature of the samples
N/A
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.
N/A
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.
N/A
N/A
.
Criteria
Sub-sampling
techniques and
sample preparation
JORC Code explanation
The total length and percentage of the relevant intersections
logged
N/A
If core, whether cut or sawn and whether quarter, half or all core
taken.
N/A
If non-core, whether riffled, tube sampled, rotary split, etc and
whether sampled wet or dry.
N/A.
For all sample types, the nature, quality and appropriateness of the
sample preparation technique.
N/A
Quality control procedures adopted for all sub-sampling stages to
maximise representivity of samples.
Quality of assay data
and laboratory tests
Verification of
sampling and assaying
Commentary
Laboratory QC procedures for rock sample assays involve the use of internal certified reference material as assay standards, along
with blanks and duplicates.
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.
Not appropriate for this stage of exploration.
Whether sample sizes are appropriate to the grain size of the
material being sampled.
The size of samples for the rock chips is appropriate for this stage of exploration.
The nature, quality and appropriateness of the assaying and
laboratory procedures used and whether the technique is
considered partial or total.
Industry standard fire assay technique for samples using lead collection with an Atomic Absorption Spectrometry (AAS) finish was
used for gold (Method AU-AA24) and 48 elements by four acid digest ICP-MS (Method ME-MS61) at ALS in Orange.
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.
N/A
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.
Quality control procedures for assays were followed via internal laboratory protocols. Accuracy and precision are within acceptable
limits.
The verification of significant intersections by either independent or
alternative company personnel.
Significant assays have not been verified by independent or alternative companies. This is not required at this stage of exploration.
The use of twinned holes.
N/A
Documentation of primary data, data entry procedures, data
verification, data storage (physical and electronic) protocols.
Primary assay data has been entered into standard Excel templates for plotting in Mapinfo and Target. All historical data has been
entered digitally by previous explorers and verified internally by Impact.
Discuss any adjustment to assay data.
No significant adjustments have been required.
Criteria
Location of data
points
JORC Code explanation
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.
Commentary
Samples were located with a hand held GPS.
Specification of the grid system used.
The grid system for Commonwealth is MGA_GDA94, Zone 55.
Quality and adequacy of topographic control.
N/A
Data spacing for reporting of Exploration Results.
N/A.
Whether the data spacing and distribution is sufficient to establish
the degree of geological and grade continuity appropriate for the
Mineral Resource and Ore Reserve estimation procedure(s) and
classifications applied.
N/A
Whether sample compositing has been applied.
N/A
Whether the orientation of sampling achieves unbiased sampling
of possible structures and the extent to which this is known,
considering the deposit type.
N/A
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.
N/A
Sample security
The measures taken to ensure sample security.
For rock samples, chain of custody is managed by Impact Minerals Ltd. Samples for Commonwealth are delivered by Impact
Minerals Ltd personnel to ALS in Orange, NSW. Whilst in storage, they are kept in a locked yard. Tracking sheets have been set up
to track the progress of batches of samples.
Audits or reviews
The results of any audits or reviews of sampling techniques and
data.
This is not material for these Exploration Results.
Data spacing and
distribution
Orientation of data in
relation to geological
structure
SECTION 2 REPORTING OF EXPLORATION RESULTS
Criteria
Mineral tenement and land
tenure status
Exploration done by other
parties
Geology
Drill hole Information
Data aggregation methods
Relationship between
mineralisation widths and
intercept lengths
JORC Code explanation
Commentary
Type, reference name/number, location and ownership including
agreements or material issues with third parties such as joint ventures,
partnerships, overriding royalties, native title interests, historical sites,
wilderness or national park and environmental settings.
The Commonwealth Project currently comprises 3 exploration licences covering 315 km2. The tenements
are held 100% by Endeavour Minerals Pty Ltd, a subsidiary company of Impact Minerals Limited. No
aboriginal sites or places have been declared or recorded in areas where Impact is currently exploring.
There are no national parks over the license area.
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.
The tenements are in good standing with no known impediments.
Acknowledgment and appraisal of exploration by other parties.
No significant exploration has been recorded by previous explorers. Some rock chip samples have been
taken but no drilling.
Deposit type, geological setting and style of mineralisation.
Exploration is focussed on the discovery of porphyry copper-gold mineralisation and other intrusive-related
gold deposit styles.
A summary of all information material to the understanding of the
exploration results including a tabulation of the following information for all
Material 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.
N/A
In reporting Exploration Results, weighting averaging techniques, maximum
and/or minimum grade truncations (e.g. cutting of high grades) and cut-off
grades are usually Material and should be stated.
N/A
Where aggregate intercepts incorporate short lengths of high grade 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.
N/A
The assumptions used for any reporting of metal equivalent values should be
clearly stated.
N/A
These relationships are particularly important in the reporting of Exploration
Results.
If the geometry of the mineralisation with respect to the drill hole angle is
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 (e.g. ‘down hole length, true width not
known’).
N/A
Criteria
Diagrams
Balanced reporting
JORC Code explanation
Commentary
Appropriate maps and sections (with scales) and tabulations of intercepts
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.
Refer to Figures in body of text.
Where comprehensive reporting of all Exploration Results is not practicable,
representative reporting of both low and high grades and/or widths should
be practiced to avoid misleading reporting of Exploration Results.
All assay results have been reported.
Other substantive exploration
data
Other exploration data, if meaningful and material, 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 deleterious or contaminating
substances.
Further work
The nature and scale of planned further work (e.g. tests for lateral
extensions or depth extensions or large-scale step-out drilling).
Diagrams clearly highlighting the areas of possible extensions, including the
main geological interpretations and future drilling areas, provided this
information is not commercially se
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