Go Back Email this Link to a friend

TAWANA RESOURCES NL - Addendum to announcement released 6 September 2017

Release Date: 14/09/2017 12:05:00      Code(s): TAW       PDF(s):  
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
Share code on the Australian Securities Exchange Limited: TAW
(“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
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
                                                                      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:
               Quality control procedures adopted for all sub-
                                                                    HoleID      East      North       Intervals
               sampling stages to maximise representivity of
                                                                    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
               Whether sample sizes are appropriate to the grain
                                                                    LRCD0042 421,762 6,512,199         120-154m
               size of
               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

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
                                                                          -    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

                                                                      Weathering of the pegmatites yields secondary
                                                                      mineralised accumulations in alluvial/eluvial
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
                   • 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
                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
                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.
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

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.
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
                                                                       -   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.

Date: 14/09/2017 12:05:00 Produced by the JSE SENS Department. The SENS service is an information dissemination service administered by the JSE Limited ('JSE'). 
The JSE does not, whether expressly, tacitly or implicitly, represent, warrant or in any way guarantee the truth, accuracy or completeness of
 the information published on SENS. The JSE, their officers, employees and agents accept no liability for (or in respect of) any direct, 
indirect, incidental or consequential loss or damage of any kind or nature, howsoever arising, from the use of SENS or the use of, or reliance on,
 information disseminated through SENS.

Email this JSE Sens Item to a Friend.

Send e-mail to
© 2020 SHARENET (PTY) Ltd, Cape Town, South Africa
Home     Terms & conditions    Privacy Policy
    Security Notice    Contact Details
Market Statistics are calculated by Sharenet and are therefore not the official JSE Market Statistics. The calculation/derivation may include underlying JSE data.