Greenvale Acquires Advanced High Grade Oasis Uranium Project
Released
Released
Announcement PDF
13 January 2025
GREENVALE ACQUIRES 100% INTEREST IN ADVANCED
HIGH GRADE OASIS URANIUM PROJECT, LOCATED 50KM
WEST OF GREENVALE FNQ
Oasis was discovered during the 1970s uranium exploration push by International
companies , most notably Esso whose subsequent work (1977-1979) defined high
priority targets with only the Oasis deposit drill tested to date
Oasis occurs along a structure associated with a major crustal terrane boundary.
(Lynd Mylonite Zone). The metamorphic host rocks, voluminous granite and
leucogranite and deformation history share many of the characteristics that can be
interpreted as Intrusive (Alaskite) style of uranium mineralisation . This is an exciting
possibility, if further exploration continues to strengthen the analogy with world class
uranium mines like the Rossing, Namibia.
Highlights:
•
•
•
•
•
•
•
Greenvale acquires 100% interest in EPM 27565, covering 90 km 2 of fault bound
alkaline intrusive and metamorphic terrane which includes the high grade Oasis
uranium deposit and 8 additional high priority uranium targets
Airborne radiometric uranium anomalies were located by Anglo American in
1973, Esso completed major on ground work 1977-1979 1nd drilled 46 holes (32
diamond, 14 percussion) for a total of 4755 m. Esso defined high grade primary
uranium mineralisation over a 300m strike length and 200m vertical depth.
Mineralisation remains open at depth and possibly along strike.
Four due diligence diamond drill holes completed in 2006 by Glengarry
Resources validated the historic Esso data and confirmed continuous high
grade mineralisation with intercepts up to 1m @ 0.72% U3O8 (15.8 lbs/t).
Oasis shear is interpreted to extend undercover for another 1.5Km to the north
and remains untested for extensions to mineralisation.
Historical radiometric and magnetic data identified large zones of structurally
controlled anomalism which remain untested by drilling
Most recently Terra Search Pty Ltd reprocessed and interpreted the historic
geophysical data identifying 9 priority Uranium anomalies over a 10km strike
length adjacent to ,, and apparently emanating from the major terrane
boundary delineated as the Lynd Mylonite Zone.
Geoscience Australia (GA) have age dated Oasis Uraninite and associated
alteration sericite which has determined a mineralisation age of 433 +/-4 Ma.
This Silurian date coincides the uranium mineralisation with the major period of
felsic plutonism present across the region. It also strengthens the association
REGISTERED OFFICE:
Level 6, Suite 606 10 Market Street, Brisbane, Queensland 4000
+61 7 3212 6299 | admin@greenvaleenergy.com.au | www.greenvaleenergy.com.au
ABN
54
000
743
555
•
of the intrusive bodies of the age in the area which are the likely drivers of the
U mineralization. The recording of alaskite intrusives of similar age , along with
other features such as the mineralisation occurring in shear hosted structural
niches within tightly folded high grade metamorphism associated with chloritebiotite alteration, again strengthens the intrusive related ”Alaskite
mineralization style” analogy.
This latter point could be highly significant as Alaskites account for around 10%
of global Uranium reserves and are generally large, moderate grade deposits,
the most striking example being Rossing, Namibia.
Greenvale Energy Ltd (ASX: GRV, “Greenvale” or “the Company”) is pleased to advise it
has acquired a 100% interest in the advanced high grade Oasis Uranium project. The Oasis
deposit and associated regional uranium anomalism are contained with EPM 27565 which
cover 53 subblocks over an area of 90 km2 and located 250 km west of Townsville and 50
km west of Greenvale in FNQ (Figure 1). The project area is located entirely within the Lynd
Station pastoral land. The company has acquired the 100% interest from the vendors
Maverick Exploration Pty Ltd, Remlain Pty Ltd and Mineral Intelligence Pty Ltd (equal 1/3
each interest) for a consideration of $200,000 cash and the issue of 20 million Greenvale
shares.
Figure 1. Location Oasis project
GREENVALE
ENERGY
LIMITED
2
The acquisition of Oasis adds considerable weight to Greenvale’s portfolio of Uranium
exploration projects and is expected to be rapidly upgraded to resource status during the
2025 exploration season.
Project Geology and Mineralisation
Geology within EPM 27565 is dominated by structurally complex mixture of intrusive
granitic and metamorphic rocks of Proterozoic, , Ordovician and Silurian Age with recent
age dating of uraninite from the Oasis deposit recording a Silurian age. The Lynd Mylonite
Zone is a dominant structural feature which strikes north north-east through the centre of
the exploration permit. Multiple faults and fractures splaying off the western side of the
mylonite appear to control the distribution of extensive zones of uranium anomalism
including the Oasis deposit. The granitic-metamorphic terrane hosting the uranium
mineralisation is bounded 10km’s to the east by the Far East Mylonite Zone which strikes
parallel to the Lynd Mylonite Zone
Figure 2. Simplified Regional Geology
GREENVALE
ENERGY
LIMITED
3
Previous Exploration
Uranium potential was first identified by Aust Anglo American in 1973-74 from airborne
radiometrics followed up by ground radiometrics, mapping and trenching. Three clusters
of anomalies were identified on the western side of the Lynd Mylonite Zone including the
Oasis anomaly. From 1977-1979 Esso Minerals conducted ground radiometrics, mapping
and auger drilling prior to completing 34 diamond drill holes and 14 percussion holes at
the Oasis prospect. Esso drilling defined a continuous zone of high grade mineralisation
of varying thickness over a 300m strike length and 200m vertical depth (Table 1). The
mineralisation remained open along strike and at depth. No further work was undertaken
at oasis or other prospects.
Table 1. Esso Oasis 1978 Diamond Core and Open Hole Percussion
Table 1 Esso Oasis Drill Results 1978 Diamond Core Holes. Grades are from
the ALS lab analyses ( XRF ) Units in % U3O8 and pounds per short ton of U3O8
(lbs/t).
Hole
Easting
AMGE
Northing
AMGN
OAD001
230592
7918713
OAD002
230593
7918684
OAD003
230598
7918659
OAD004
230576
7918740
Hole
Depth
(m)
0.15
3.4
incl.
28.65
29.05
0.4
0.6
13.2
44
28
37.5
9.5
0.23
5.1
incl. and
29.15
29.7
0.55
0.61
13.4
36
37
1
0.72
15.8
43.7
23.5
34.8
11.3
0.07
1.5
incl.
34.3
34.8
0.4
0.37
8.1
70.9
48.3
55.7
6.7
0.23
5.1
incl.
49
52.5
3.5
0.36
7.9
46.7
28.7
30.5
1.8
0.23
5.1
incl.
28.7
29.8
1.1
0.36
7.9
230598
7918632
42
OAD007
230593
7918609
52.9
OAD008
230592
7918584
NSR
35
36.4
1.4
0.07
1.5
63.4
48
50.5
2.5
0.07
1.5
46.7
incl.
28.5
33.9
5.4
0.16
3.5
30.2
31.2
1
0.42
9.2
32.6
33.1
0.5
0.45
9.9
and
OAD010
230612
7918807
42
NSR
OAD011
230624
7918830
47
NSR
OAD012
230632
7918856
41
79.8
58.2
7918687
incl.
59
OAD014
GREENVALE
230566
230576
7918786
ENERGY
LIMITED
(lbs/t)
2.65
OAD006
OAD013
U3O8
30.5
7918760
7918790
To (m)
U3O8
(%)
27.85
230597
230610
(m)
Intersection
(m)
54.9
OAD005
OAD009
From
72.6
81.1
60.6
No
Assays
2.4
0.23
5.1
60
1
0.43
9.5
63.1
64.6
1.5
0.13
2.9
57.2
52.6
60.5
54.6
3.3
2
0.06
0.1
1.3
2.2
4
incl.
OAD015
230572
7918615
79.8
OAD016
230565
7918662
incl.
and
incl.
53.6
54.1
0.5
0.24
5.3
63.4
66
2.6
0.1
2.2
62.4
67
4.6
0.14
3.1
62.8
63.8
1
0.29
6.4
65.3
66.3
1
0.22
4.8
70.5
71.4
0.9
0.13
2.9
70.9
71
0.1
0.98
21.6
35.4
36.4
0.8
0.12
2.6
OAD017
230608
7918557
52.1
OAD018
230622
7918531
43
Hole
Easting
AMGE
Northing
AMGN
Hole
Depth
(m)
OAD019
230516
7918693
130.8
OAD020
230518
7918743
OAD021
230527
7918793
141
OAD022
230520
7918618
142.7
OAD023
230545
7918564
129
NSR
OAD024
230524
7918768
127
NSR
OAD025
230516
79118720
126.7
OAD026
230520
7918667
NSR
From
(m)
To (m)
Intersection
(m)
U3O8
(%)
(lbs/t)
117.8
120.9
3.1
0.08
1.8
119.4
119.9
0.5
0.29
6.4
126.8
113.3
115.25
1.95
0.23
5.1
incl.
113.4
113.85
0.62
13.6
122
126.3
0.45
No
Assays
4.3
0.07
1.5
149.7
incl.
107
123.5
109.5
124
2.5
0.5
0.09
0.69
2
14.1
111.65
114.3
2.65
0.11
2.7
111.65
112.1
0.45
0.43
9.5
143.65
143.85
0.38
8.4
0.07
0.19
1.5
4.2
0.24
5.3
OAD027
230535
7918590
129
OAD028
230624
7918505
OAD029
230502
7918644
52.8
150.8
41.5
134.55
43
135.85
0.2
No
Assays
1.5
1.3
incl.
135.2
135.85
0.65
OAD030
230592
7918533
76
OAD031
230595
7918512
90
OAD032
230655
7918891
47
NSR
No
Assays
NSR
OAD033
230659
7918417
40
No
OAD034
OAD035
230644
230688
7918392
7918396
100
75
No
OAP001
230565
7918713
75
OAP002
230575
7918761
80
ENERGY
LIMITED
GREENVALE
U3O8
NSR
56
62
6
0.11
2.4
NSR
5
During 2005-6 Glengarry Resources drilled 4 diamond holes which validated the Esso
work (Table 2). Glengarry also conducted soil and costean sampling along strike from the
Esso drilling and confirmed continuity of uranium mineralisation for a further 300m to the
south.
Table 2. Glengarry 2005-6 diamond drilling program
Hole_Id
F/Depth (m)
05LYD001
100
AMG
East
230573
AMG
North
7918732
From
(m)
To
(m)
Interval
(m)
Intersection
(U3O8)
54
64
10
10m @ 0.12%
61
62
1
1m @ 0.25%
34
41
7
7m @ 0.17%
36
37
1
1m @ 0.38%
39
41
2
2m @ 0.21%
092/60
92
97
5
5m @ 0.15
incl.
93
94
1
1m @ 0.26
092/60
170
172
2
2m @ 0.15
incl.
170
171
1
1m @ 0.21
Az/Dip
090/60
7918685
05LYD002
65.4
230588
incl.
090/60
+
06LYD003
06LYD004
101.00
194.66
230536
230469
7918182
7918723
Uranium analysis by Pressed Pellet Wavelength XRF, with a lower limit of detection of 4ppm U O
From 2007-2010 Mega Georgetown (MG), a Canadian Company, drilled 10 RC holes at
Oasis for a total of 1710m. The drilling was designed to test for continuity of mineralisation
outside of the Esso drilling envelope and confirmed extensions of mineralisation to the
north and at depth (Figure 3) (Table 3). All holes intersected uranium mineralisation
although of lower tenor than Esso diamond drilling. MG also completed a detailed 50100m line spaced aeromagnetic survey identifying numerous structural zones coincident
with radiometric anomalism.
GREENVALE
ENERGY
LIMITED
6
Table 3. Mega Georgetown RC Percussion drilling 2007
HoleID
Depth
(m)
Angle
(Mag)
MGA
East
OMRC001
228
‐60 to 090
230586
MGA
North
From
(m)
To
(m)
metres
Uppm
187
201
14
216
210
213
3
447
7918840
OMRC002
210
‐58 to 090
230592
7918796
181
186
5
80
OMRC003
198
‐60 to 090
230596
7918949
169
172
3
211
OMRC004
150
‐60 to 090
230659
7918992
106
109
3
127
OMRC005
192
‐60 to 092
230617
7918997
170
171
1
331
OMRC006
114
‐60 to 090
230702
7919038
70
78
8
70
163
9
241
192
‐60 to 090
154
OMRC007
230617
7918745
170
171
1
90
OMRC008
90
‐60 to 090
230657
7918692
66
67
1
54
OMRC009
180
‐60 to 090
230606
7918699
146
147
1
102
OMRC010
156
‐60 to 090
230653
7919042
134
138
4
158
GREENVALE
ENERGY
LIMITED
7
Figure 3. Mega Georgetown RC drill plan
From 2021, Maverick Exploration in conjunction with Townsville based mineral consultants
Terra Search Pty Ltd have undertaken a major historic data compilation and data capture
exercise. As part of this work Principal Geologist Dr Simon Beams completed a detailed
study of the Glengarry (most recent) drill core from Oasis. While Geophysicist Tim Beams
carried out a major reprocessing and interpretation of the Mega Georgetown airborne and
ground magnetic and radiometric surveys resulting in high resolution images providing
significant insights into the geology and structural controls of the Project (Figure 4).
GREENVALE
ENERGY
LIMITED
8
Oasis Deposit
Figure 4. Uranium radiometrics EPM 27565
The recent work by Terra Search has demonstrated the potential of EPM 27565 to host
multiple structurally controlled uranium deposits as exemplified by Oasis. Nine priority
targets have been identified by Terra Search based on elevated radiometrics coincident
with structural corridors (Figure 5). Note Target A is a discrete, intense U anomaly which
encompasses the Oasis uranium deposit.
GREENVALE
ENERGY
LIMITED
9
Figure 5. Potential Uranium Targets EPM 27565
Terra Search also noted comparisons between Oasis and Intrusive Type Uranium
deposits. Recent age dating of Oasis uraninite confirms mineralisation occurred in the Mid
Silurian in conjunction with leucogranite emplacement in the region. Mineralisation at
Oasis is hosted by a quartz chlorite biotite schistose shear zones, with country rocks
dominated by metamorphic host rocks, calc silicates and voluminous granite/
leucogranite. It was noted that these host rocks and deformation history share many of
the characteristics that can be interpreted as Intrusive (Alaskite) style of uranium
mineralisation . Further exploration is planned to strengthen this analogy as world class
uranium mines like Rossing ,,Namibia are of the Intrusive (Alaskite) type which are
GREENVALE
ENERGY
LIMITED
10
generally large moderate grade deposits hosting approximately 10% of global uranium
reserves.
Proposed Exploration program
Greenvale proposes an aggressive 2025 exploration program at Oasis with the goal of
bringing known and extended mineralisation at Oasis to JORC 2012 resource status. This
is to be done in three stages:
1. Geochemical testing of entire Oasis shear which extends under cover for 1.5kms
north of identified mineralisation by track etch technique (radon gas cupping,
emanometry) (Figure 7) and geological prospecting.
2. Geochemical testing of 8 priority coincident radiometric/structural anomalies by
track etch technique in conjunction with geological prospecting and follow up
drilling of identified targets.
3. Ground truthing and detailed mapping of all undercover structural splays
emanating from the Lynd Mylonite zone where radiometrics don’t work and
geochemical testing of identified splays with track etch technique.
Figure 7. Etch Cup Exploration
GREENVALE
ENERGY
LIMITED
11
Corporate
Transaction Details
The transaction allows for the acquisition of EPM27565 from the Vendors, Maverick
Exploration Pty Ltd, Remlain Pty Ltd and Mineral Intelligence Pty Ltd (equal 1/3 each
interest), who are not a related party, nor are they shareholders of the Company. The key
terms are summarised below:
•
•
•
The Company has entered into a binding terms sheet with the Vendors to acquire
buy100% of the Vendors legal interest and all of the beneficial interest in
EPM27565;
The Company agrees to pay $200,000 in cash and issue 20 million Greenvale
shares.
Conditions precedent to the transaction include:
o all Indicative Approvals for the transfer of the EPM27565 from the Vendors
to Greenvale;
o removal or release of any Encumbrance effecting EPM27565; and
o any ASX or shareholder approval for a transaction of this type (if required).
Funding
In addition to cash on hand, Greenvale received in early January 2025, $1.175 million from
the 2024 R&D rebate. Additionally, the Company expect to receive $250,000 from the sale
of EP145 in the coming weeks.
Greenvale also notes that $3m loan facility with entities associated with Directors Neil
Biddle and Leo Khouri1 remains in place and is yet to be finalised and drawn.
Given the funding position detailed above, there is sufficient working capital for the
Company to proceed immediately with its work programs on its Queensland and NT
Uranium Projects and Stage 1 of Test Program 6 at the Alpha Torbanite Project.
Authorised for release:
This announcement has been approved by the Board of Greenvale for release.
For further information please contact:
Investors: Neil Biddle, Executive Chairman
Media: Nicholas Read
Engage and Contribute: Investor Hub
E NBiddle@greenvaleenergy.com.au
P +61 (0) 419 929 046
Greenvale Energy Interactive Investor Hub
1 Refer ASX Announcement 20 October 2022, Extension to Share Purchase Plan and Additional
Financial Support Provided by Directors to Advance Alpha Project.
12
GREENVALE
ENERGY
LIMITED
Engage with Greenvale directly by asking questions, watching video summaries and
seeing what other shareholders have to say about this, as well as past announcements.
Join our Investor Hub
Visit http://investorhub.greenvaleenergy.com.au/welcome
COMPETENT PERSON STATEMENT
ASX ANNOUNCEMENT GREENVALE ENERGY, 13/1/2025.
The information in this report that relates to exploration results is based on
information compiled by Dr. Simon D. Beams, a full-time employee of Terra Search
Pty Ltd, geological consultants to Greenvale Energy to carry out geological evaluation
of the mineralisation potential of the Oasis Project, north Queensland, Australia.
Dr. Beams has BSc Honours and PhD degrees in geology; he is a Member of the
Australasian Institute of Mining and Metallurgy (Member #107121) and a Member of
the Australian Institute of Geoscientists (Member # 2689). Dr. Beams has sufficient
relevant experience in respect to the style of mineralization, the type of deposit under
consideration and the activity being undertaken to qualify as a Competent Person
within the definition of the 2012 Edition of the Australasian Code for Reporting of
Exploration Results, Mineral Resources and Ore Reserves (“JORC Code).
Dr. Beams consents to the inclusion in the report of the matters based on this
information in the form and context in which it appears.
GREENVALE
ENERGY
LIMITED
13
APPENDIX 1 – JORC Code Table 1 Greenvale Energy Limited Oasis Uranium Project
Acquisition ASX announcement 13th January, 2024
JORC Code Table 1
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 sampling representivity and the
appropriate
calibration
of
any
measurement tools or systems used.
GREENVALE
ENERGY
Only summary results from historical
drilling are reported here. No new
samples were collected for this
announcement. All data discussed has
been previously reported in historical
statutory reports carried out by public
listed exploration companies in the
2000’s or major international mining
and exploration companies in the
1970’s. Results are recorded from
drilling at the Oasis project area in the
period from the 1977 to 2008. .
Given that uranium was the primary
exploration target, initially both
diamond core and percussion samples
were evaluated for uranium using
radiometric instruments : either hand
held spectrometers or down hole
radiometric loggers. Any significant
radiometric anomalism was further
investigated by sampling and analysis
at a commercial NATA standard
laboratories. .
Esso 1977-1979 Historic Drilling
A total of 14 open hole percussion
and 32 precollared diamond holes
were drilled totalling 4755 metres.
All holes were radiometrically logged
with a fully calibrated Mt Sopris
2500 logger. Intervals with
anomalous radiometric readings were
sawn and half core samples
forwarded to commercial labs for
XRF analysis . Comparison of
chemical (XRF Lab Uranium grades )
and radiometric grades were then
made to ensure representivity and
grade confirmation by two
independent techniques. .
Sample
representively.was
also
established by high quality logs which
are presented in statutory reports with
drill data complied by highly
experienced geologists.
Open hole percussion
In contrast to Esso’s diamond drilling
which showed good correlation
between chemical and radiometric
grades, U3O8 assays in the percussion
LIMITED
14
holes were often less than half of the
value indicated by radiometric logging
suggesting
unrepresentative
compromised sampling in the Esso
open hole percussion holes.
Esso used deep open hole percussion
drilling to test the depth potential;
however, they concluded that this
was of limited effectiveness due to
high water flows (poor recovery?)
and the holes not staying straight. For
these reasons, Esso elected not to
assay most of the deep percussion
holes.
Glengarry 2005-6 Historic Drilling
Diamond drilling was designed to
validate historical diamond core and
shallow open hole percussion drill
hole intersections reported by Esso
Minerals. Half diamond core was
sampled on regular 1m intervals
Mega Georgetown 2007 Historic
Drilling
In 2007, Mega Georgtown drilled ten
reverse circulation percussion drill
holes at the Oasis Prospect to confirm
previous drill results returned by
Esso. For all drill holes a 150mm face
sampling hammer was used to
penetrate the soil and overburden.
This interval was then cased off with
150mm PVC casing. After this collar
pipe was set, the remainder of the hole
was drilled using a 133mm face
sampling hammer. The PVC collar
pipe was left in the hole at the
completion of drilling.
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 1m
samples from which 3kg was pulverised to
produce a 30g 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.
GREENVALE
ENERGY
Esso 1977-1979 Historic Drilling
Diamond drill holes targeted the Oasis
structure as delineated by surface
(trench) sampling and uranium
radiometric surveying. Half core
samples were
crushed split and
ground at ALS Brisbane , sample
pulps were assayed on a pressed pellet
for uranium by XRF. Multi -element
analyses were also carried out on a
limited number of samples by XRF.
Downhole radiometric logging was
standard on all diamond and
percussion
holes.
Sampling
methodology for percussion drilling
LIMITED
15
lab samples is not recorded , but
industry standard procedures at the
time would have involved running
sample through a sample splitter to
produce a 3kg sample to then undergo
sample preparation and XRF analysis
at ALS Brisbane.
Glengarry 2005-6 Historic Drilling
Glengarry’s diamond drill program
was primarily focussed on providing
Due Diligence on Esso’s 1977-1979
drill results. Half core samples were
crushed split and ground at ALS
Townsville , sample pulps were
assayed on a pressed pellet for
uranium by XRF, 50g Fire assay
samples for Au and a suite of multielements by Four Acid Digest ICP.
Mega Georgetown 2007 Historic
Drilling
Glengarry’s RC drill program was
targeting deeper intersections on the
Oasis uranium structure. Reverse
circulation (RC) Percussion samples
were collected at one metre intervals.
Samples from the rig were fed
through a cyclone to a 7:1 sample
splitter. The larger split was collected
in a large plastic bag marked with
hole number and interval and the
smaller split was collected in a
similarly marked calico bag. Plastic
bags were left on site while the calico
bags were transported to the Maureen
(Georgetown) core shed for storage.
Mega Georgetown
Logging /Geochem :
Radiometric
The large sample in the plastic bag
was tested on site for radioactivity
using a GF Instruments Gamma
Surveyor spectrometer reading in
“Assay Mode”. This mode measures
the whole gamma spectrum and
calculates the concentration of
elements K (%), eU (ppm) and eTh
(ppm). The concentration of K is
measured directly, while the eU and
eTh concentrations are based on
detection of radioisotopes 214Bi and
GREENVALE
ENERGY
LIMITED
16
208Tl that are part of the related
disintegration series.
Radiometric anomalous samples
were despatched to ALS in
Townsville for sample preparation
and analysis.where samples were
crushed split and ground at ALS
Townsville , sample pulps were
assayed on a pressed pellet for
uranium by XRF, 50g Fire assay
samples for Au and a suite of multielements by Four Acid Digest ICP.
Drilling techniques
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.)
Esso 1977-1979 Historic Drilling
Diamond core drilling mainly NQ
diameter. No core orientation.
Open Hole percussion drilling in the
late 1970’s ie. Conventional hammer
drilling.
Glengarry 2005-6 Historic Drilling
Diamond drilling was completed
using either NQ (2005 drilling) or NQ2 core (2006 drilling). Glengarry
reported orienting the core, some
marks are present but full details are
sketchy. A reference bottom of hole
orientation line is occasionally present
on the half core. Sampled intervals
were cut just off the orientation line.
Mega Georgetown 2007 Historic
Drilling
Reverse circulation (RC) percussion
drilling with a 150mm face sampling
hammer used to penetrate the soil and
overburden. This interval was then
cased off with 150mm PVC casing.
After this collar pipe was set, the
remainder of the hole was drilled
using a 133mm face sampling
hammer. The PVC collar pipe was
left in the hole at the completion of
drilling.
Drill sample recovery
GREENVALE
Method of recording and assessing core
and chip sample recoveries and results
assessed.
ENERGY
Esso 1977-1979 Historic Drilling
Esso discussed several issues which
highlight the shortcomings of some of
the Esso drill results. Poor core
recovery through some of the ore zones
and sample smearing in the open hole
LIMITED
17
percussion holes led Esso to give
greater weight to the Mt Sopris Logger
radiometric grades. Esso used deep
open hole percussion drilling to test the
depth potential; however, they
concluded that this was of limited
effectiveness due to high water flows
(poor recovery?) and the holes not
staying straight. For these reasons,
Esso elected not to assay most of the
deep percussion holes.
Glengarry 2005-6 Historic Drilling
Core recovery was recorded in logs
and on core photographs.
Mega Georgetown 2007 Historic
Drilling
Radiometric logging of RC cutting
bags provided guidance as to those
down hole intervals for which
geochemical assaying is justified.
There is good correlation between
radiometric readings for uranium and
assay
lab
uranium
values.Spectrometer readings should
not be considered to provide absolute
values given the limited volume of the
samples. These results provide
confidence that all significant uranium
mineralisation intersected in the
drilling program was sampled for
assay.
Measures taken to maximise sample
recovery and ensure representative nature
of the samples.
Esso 1977-1979 Historic Drilling
Esso discussed several issues which
highlight the shortcomings of some of
the Esso drill results. Poor core
recovery through some of the ore zones
and sample smearing in the open hole
percussion holes led Esso to give
greater weight to the Mt Sopris Logger
radiometric grades. Esso used deep
open hole percussion drilling to test the
depth potential; however, they
concluded that this was of limited
effectiveness due to high water flows
(poor recovery?) and the holes not
staying straight. For these reasons,
Esso elected not to assay most of the
deep percussion holes.
Glengarry 2005-6 Historic Drilling
GREENVALE
ENERGY
LIMITED
18
Core recovery was shown to be good
in logs and on core photographs
Drilling procedure was effective. .
Mega Georgetown 2007 Historic
Drilling
RC sampling was checked with
radiometric logging of RC cutting
bags .Mega Georgetown demonstrated
the effectiveness of the RC sample
recoveries, taking into account that
spectrometer readings should not be
considered to provide absolute values
given the limited volume of the
samples. These results provide
confidence that all significant uranium
mineralisation intersected in the
drilling program was sampled for
assay.
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.
Logging
In the Esso open hole percussion
drilling ,high water flows and drill
hole deviation meant targets were not
reached
and
sampling
was
compromised.. In the other drill
programs sampling bias is not
apparent. Overall recoveries of the
Esso Core, Glengarry Due Diligence
core holes and Mega Georgetown RC
drilling is shown to be reasonable to
excellent
and
supported
by
radiometric logging.
Whether core and chip samples have been Drill samples :Geological logging
geologically and geotechnically logged to was
carried
out
by
wella level of detail to support appropriate
trained/experienced
geologist
and
data
Mineral Resource estimation, mining
entered
via
a
well-developed
logging
studies and metallurgical studies
system designed to capture descriptive
geology,
coded
geology
and
quantifiable geology. All historical
logs have checked for consistency and
reassessed in a state of the art
Relational Data Base by the Principal
Geologist. Data has been captured
digitally through Excel spread sheets
and Explorer 3 Relational Data Base
Management System.
Whether logging is qualitative or
quantitative in nature. Core (or costean,
channel etc.) photography.
The logging of Diamond core and RC
chips is both qualitative and
quantitative. Alteration, weathering
and mineralisation data contain both
qualitative and quantitative fields
.
The total length and percentage of the The entire length of all drill holes has
relevant intersections logged.
been geologically logged.
GREENVALE
ENERGY
LIMITED
19
Sub-sampling
techniques and
sample preparation
If core, whether cut or sawn and whether
quarter, half or all core taken.
Drill core sampli
Share your feedback
Discover