Wrap Text
Addendum to announcement released 6 September 2017
Tawana Resources NL
(Incorporated in Australia)
(Registration number ACN 085 166 721)
Share code on the JSE Limited: TAW
JSE ISIN: AU0000TAWDA9
Share code on the Australian Securities Exchange Limited: TAW
ASX ISIN: AU000000TAW7
(“the Company” or “Tawana”)
Addendum to announcement released 6 September 2017
Tawana Resources NL (TAW:ASX) (Tawana) and Alliance Mineral Assets Limited (SGX:AMA) (AMAL) wishes to advise that
for completeness, the JORC Table 1 for the metallurgical test work drill results referred to in the announcement titled
“Bald Hill Delivers Excellent Metallurgical Test Work Results” released on 6 September 2017, is attached at Appendix A.
This information should be read in conjunction with the aforementioned announcement.
14 September 2017
Sponsor
PricewaterhouseCoopers Corporate Finance (Pty) Ltd
Appendix A - JORC Table 1
Section 1 Sampling Techniques and Data
Criteria JORC Code Explanation Commentary
Sampling Nature and quality of sampling (e.g. cut channels, Metallurgical samples are obtained from diamond
techniques random chips, or specific specialised industry drilling, ½ core nominally 1-2m crushed to 10mm.
standard measurement tools appropriate to the A split of crushed sample assayed for head grade
minerals under investigation, such as down hole
analysis as below, the remainder retained for
gamma sondes, or handheld XRF instruments,
etc.). These examples should not be taken as metallurgical test work.
limiting the broad meaning of sampling.
Head grade samples jaw crushed and riffle split
Include reference to measures taken to ensure for pulverizing to 80% passing 75 microns.
sample representivity and the appropriate
calibration of any measurement tools or systems Prepared samples are fused with sodium peroxide
used.
and digested in dilute hydrochloric acid. The
Aspects of the determination of mineralisation resultant solution is analysed by ICP, by Nagrom
that are Material to the Public Report. In cases laboratory.
where ‘industry standard’ work has been done this
would be relatively simple (e.g. ‘reverse Certified standards. Field duplicates submitted at
circulation drilling was used to obtain 1 m samples irregular intervals at the rate of approximately
from which 3 kg was pulverised to produce a 30g 1:20.
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.
Drilling Drill type (e.g. core, reverse circulation, open- Diamond drilling with sizes ranging from PQ to
techniques hole hammer, rotary air blast, auger, Bangka, NQ3 collected in a standard tube arrangements.
sonic, etc.) and details (e.g. core diameter, triple
or standard tube, depth of diamond tails, face- No moderately or highly weathered mineralised
sampling bit or other type, whether core is zones were intercepted. Sample quality is high.
oriented and if so, by what method, etc.).
Diamond core has been oriented where possible
using the Reflex Ezi-Ori tool.
Drill sample Method of recording and assessing core and chip Core recovery for mineralised intervals was high
recovery sample recoveries and results assessed. at about 100%.
Measures taken to maximise sample recovery and Core used for test work was fresh rock. There has
ensure representative nature of the samples. been no sample bias.
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 Whether core and chip samples have been Geological logs exist for all drill holes with
geologically and geotechnically logged to a level lithological codes via an established reference
of detail to support appropriate Mineral Resource legend.
estimation, mining studies and metallurgical
studies. Drill holes have been geologically logged in their
Whether logging is qualitative or quantitative in entirety. Where logging was detailed, the
nature. Core (or costean, channel, etc.) subjective indications of mineral content
photography (spodumene, tantalite) have been recorded.
The total length and percentage of the relevant Assays have generally only been submitted
intersections logged. through mineralised pegmatites.
Criteria JORC Code Explanation Commentary
Sub-sampling If core, whether cut or sawn and whether quarter, A split of crushed sample assayed for head grade
techniques half or all core taken. analysis, the remainder retained for metallurgical
and sample If non-core, whether riffled, tube sampled, rotary test work.
preparation split, etc. and whether sampled wet or dry.
For all sample types, the nature, quality and
Core holes used for the master composite for
appropriateness of the sample preparation
metallurgical testwork where:
technique.
Sample
Quality control procedures adopted for all sub-
HoleID East North Intervals
sampling stages to maximise representivity of
samples.
LDD0001 421,749 6,512,322 100.3-107.3m
Measures taken to ensure that the sampling is
representative of the in situ material collected,
LDD0002 421,911 6,512,757 33-39m
including for
instance results for field duplicate/second-half
LRCD0006 421,757 6,512,324 177.1-184m
sampling.
Whether sample sizes are appropriate to the grain
LRCD0042 421,762 6,512,199 120-154m
size of
133.6-135.6m
the material being sampled.
LRCD0043 421,625 6,512,001 168.7-170.7m
Sampling and blending of composites was
undertaken by Nagrom under instruction from the
principal metallurgical consultant Mr Noel
O’Brien, FAusIMM, MBA, B. Met Eng.
Laboratory standards and laboratory repeats are
used to monitor analyses.
The final master composite totalled 148.8kg after
initial sampling and variability test work. The
master composite and variability samples are
representative of the current Mineral Reserve.
The bulk sample (from open pit waste dumps)
totalled 5,123kg.
The low grade sample composite totalled 165.5kg.
Sample sizes are considered appropriate for the
test work being undertaken.
Quality of The nature, quality and appropriateness of the The metallurgical test work for spodumene
assay data assaying and laboratory procedures used and referred to in the release was undertaken by
and whether the technique is considered partial or
Nagrom. Nagrom has extensive experience with
laboratory total.
tests Tantalum and Lithium extraction testwork and has
For geophysical tools, spectrometers, handheld ISO9001:2008 accreditation. Results have been
XRF instruments, etc., the parameters used in reported without interpretation.
determining the analysis including instrument
make and model, reading times, calibrations The metallurgical techniques being applied by
factors applied and their derivation, etc. Nagrom are considered to be robust for the
targeted minerals.
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.
Criteria JORC Code Explanation Commentary
Verification The verification of significant intersections by Drill logs exist for all holes as electronic files
of sampling either independent or alternative company and/or hardcopy.
and assaying personnel.
Digital assay and weight data sheets have been
The use of twinned holes. created with inbuilt validations to reduce
potential for mass balance errors.
Documentation of primary data, data entry
procedures, data verification, data storage
(physical and electronic) protocols.
Discuss any adjustment to assay data.
Location of Accuracy and quality of surveys used to locate Accurate surface and down hole surveying has
data points drill holes (collar and down-hole surveys), been completed for core holes.
trenches, mine workings and other locations used
in Mineral Resource estimation. All collars are surveyed using MGA Z51.
Specification of the grid system used.
Quality and adequacy of topographic control.
Data spacing Data spacing for reporting of Exploration Results. Based on the results of the variability
and metallurgical test work, the spacing of
distribution Whether the data spacing and distribution is metallurgical core samples is considered
sufficient to establish the degree of geological and appropriate for the for the area included in
grade continuity appropriate for the Mineral Mineral Reserves.
Resource and Ore Reserve estimation procedure(s)
and classifications applied. The Project mass balance is based on
metallurgical results from the master composite
Whether sample compositing has been applied. sample.
Orientation Whether the orientation of sampling achieves The drilling orientation for core holes was close to
of data in unbiased sampling of possible structures and the perpendicular to the dip and plunge of the
relation to extent to which this is known, considering the mineralised pegmatites, limiting potential for
geological deposit type. sample bias.
structure 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.
Sample The measures taken to ensure sample security. All core samples were cut, sampled and
security composted by Nagrom
Audits or The results of any audits or reviews of sampling Procedures and the methodology applied by
reviews techniques and data. Nagrom have been regularly reviewed by the
principal metallurgical consultant Mr Noel
O’Brien.
Section 2 Reporting of Exploration Results
Criteria Explanation Commentary
Mineral Type, reference name/number, location and The portfolio of mineral tenements, comprising
tenement ownership including agreements or material issues mining leases, exploration licences, prospecting
and land with third parties such as joint ventures, licences, miscellaneous licences, a general-purpose
tenure partnerships, overriding royalties, native title lease, and a retention lease are in good standing.
status interests, historical sites, wilderness or national
park and environmental settings.
The security of the tenure held at the time of
reporting along with any known impediments to
obtaining a licence to operate in the area.
Exploration Acknowledgment and appraisal of exploration by Alluvial tantalite has been mined periodically from
done by other parties. the early 1970s.
other parties Gwalia Consolidated Limited undertook exploration
for tantalite-bearing pegmatites from 1983-1998.
Work included mapping, costeaning, and several
phases of drilling using RAB, RC, and diamond
Criteria Explanation Commentary
methods. The work identified mineral resources
that were considered uneconomic at the time.
Haddington entered agreement to develop the
resource and mining
- commenced in 2001 and continued until
2005.
- Haddington continued with exploration
until 2009.
Living Waters acquired the project in 2009 and
continued with limited exploration to the north of
the main pit area.
Though extensive test work for tantalum was
undertaken by Haddington et. al. essentially no
meaningful test work was undertaken by previous
parties for spodumene recovery.
Geology Deposit type, geological setting and style of The Bald Hill area is underlain by generally north-
mineralisation. striking, steeply dipping Archaean metasediments
(schists and greywackes) and granitoids.
Felsic porphyries and pegmatite sheets and veins
have intruded the Archaean rocks. Generally, the
pegmatites cross cut the regional foliation,
occurring as gently dipping sheets and as steeply
dipping veins.
The pegmatites vary in width and are generally
comprised quartz-albite- muscovite-spodumene in
varying amounts. Late-stage albitisation in the
central part of the main outcrop area has resulted
in fine- grained, banded, sugary pegmatites with
visible fine-grained, disseminated tantalite. A thin
hornfels characterised by needle hornblende
crystals is often observed in adjacent country rocks
to the pegmatite.
Tantalite generally occurs as fine disseminated
crystals commonly associated with fine-grained
albite zones, or as coarse crystals associated with
cleavelandite.
Weathering of the pegmatites yields secondary
mineralised accumulations in alluvial/eluvial
deposits.
Drill hole A summary of all information material to the Core holes used for the variability, master
Information understanding of the exploration results including composite and low- grade composite for
a tabulation of the following information for all metallurgical test work where:
Material drill holes: De
• easting and northing of the drill hole collar Hole Depth East North RL cl. Azm
• elevation or RL (Reduced Level – elevation LDD0001 246 421749 6512322 284 -60 270
above sea level in metres) of the drill hole
LDD0002 60 421911 6512757 294 -60 90
collar
• dip and azimuth of the hole LDD0003 150 421880 6512400 286 -60 90
• down hole length and interception depth LDD0004 47 421881 6512799 293 -60 90
• hole length.
If the exclusion of this information is justified on LRCD0006 208 421757 6512324 284 -60 90
the basis that the information is not Material and LRCD0039 150 421920 6512202 280 -60 90
this exclusion does not detract from the
LRCD0042 171 421762 6512199 281 -60 90
understanding of the report, the Competent Person
should clearly explain why this is the case. LRCD0043 180 421625 6512001 281 -60 90
The above listed holes essentially covered all
mineralised core intervals within the resource, at
the time of sampling.
Criteria Explanation Commentary
Data In reporting Exploration Results, weighting No drilling exploration results have been reported.
aggregation averaging techniques, maximum and/or minimum
methods grade truncations (e.g. cutting of high grades) and
cut-off grades are usually Material and should be
stated.
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.
The assumptions used for any reporting of metal
equivalent values should be clearly stated.
Relationship These relationships are particularly important in No drilling exploration results have been reported.
between the reporting of Exploration Results.
mineralisatio
n widths and If the geometry of the mineralisation with respect
intercept to the drill hole angle is known, its nature should
lengths 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’).
Diagrams Appropriate maps and sections (with scales) and Metallurgical hole location plan has been included
tabulations of intercepts should be included for as Figure 3 of ASX announcement dated 16 March
any significant discovery being reported These 2017 / SGX announcement dated 15 March 2017
should include, but not be limited to a plan view of ‘Excellent Results from Large Scale Metallurgical
drill hole collar locations and appropriate sectional Test Work’ 07/04/17.
views.
Balanced Where comprehensive reporting of all Exploration For metallurgical procedures referenced, all
reporting Results is not practicable, representative reporting relevant results have been reported in full. For
of both low and high grades and/or widths should additional information refer announcements:
be practiced to avoid misleading reporting of
Exploration Results. - ASX announcement dated 16 March 2017 / SGX
announcement dated 15 March 2017 ‘Excellent
Results from Large Scale Metallurgical Test
Work’
- ASX announcement dated 13 February 2017 /
SGX announcement dated 12 February 2017
‘Continued Strong Metallurgical Results at the
Bald Hill Mine’
- Metallurgical section in the ASX announcement
dated 11 July 2017 / SGX announcement dated
8 August 2017
Other Other exploration data, if meaningful and Results have been reported without interpretation.
substantive material, should be reported including (but not
exploration limited to): geological observations; geophysical
data 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. Further metallurgical test work is warranted to
tests for lateral extensions or depth extensions or confirm and improve successful methodology.
large-scale step-out drilling). Additional test work is recommended as the
resource expands.
Diagrams clearly highlighting the areas of possible
extensions, including the main geological
interpretations and future drilling areas, provided
this information is not commercially sensitive.
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