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Suite 9, 18 Stirling Highway, Nedlands, Western Australia, 6009 Registered Office: 79 Broadway, Nedlands, Western Australia, 6009
ORA BANDA SOUTH GOLD PROJECT
ASX RELEASE 17 FEBRUARY 2016
Aircore drilling program confirms the presence of primary bedrock gold mineralisation in the Black Flag Group (BFG) sediments within the Ora Banda South Project.
Siburan’s aircore drilling program has returned significant gold mineralisation (> 0.50g/t Au) from several holes including 16m @ 1.03 g/t at the end of hole in OBAC033 from composite sampling (4m downhole composite samples).
Mineralised zone is associated with disseminated sulphide (up to 5%), quartz veining and strong carbonate-silica alteration within intermediate volcaniclastics.
Siburan has completed its expenditure commitments to earn 51% of the project.
Siburan Resources Limited (ASX: SBU, Siburan) is pleased to advise that the Company’s maiden aircore drilling program at the Ora Banda South Gold Project near Kalgoorlie in Western Australia’s goldfields has returned significant gold mineralisation.
Siburan’s maiden aircore drilling program at the Ora Banda South Project comprised 21 holes for 1,698m (OBAC014 – OBAC034). The drilling was undertaken to test for strike extensions to gold mineralisation encountered in a historical aircore hole, KWAC 055.
The holes were drilled on four east-west orientated traverses, spaced 40 to 80m apart. Holes were drilled to aircore blade refusal on 40m to 80m centres along the drill traverses (Figure 1).
Figure 1 – Ora Banda South Project showing recent aircore drilling and maximum gold in drilling.
The drilling intersected a weathered sequence of felsic to intermediate volcaniclastics and sediments, of the Black Flag Group, beneath a thin (1 – 5m) veneer of transported cover. Holes depths ranged from 53m to 95m.
The drilling program returned significant gold mineralisation (> 0.50g/t Au) from several holes including 16m @ 1.03 g/t at the end of hole in OBAC033 from composite sampling (4m downhole composite samples).
The mineralised zone in OBAC033 is associated with disseminated sulphide (up to 5% pyrite), quartz veining and strong carbonate-silica alteration within intermediate volcaniclastics (Photograph 1 and 2). One metre resampling has returned individual one metre downhole interval assays of up 3.61 g/t Au and a bottom of hole assay of 2.91 g/t Au. A schematic drill section showing OBAC033 is presented in Figure 2.
Figure 2 – Schematic Cross Section 6628020mN - Ora Banda South Project.
The mineralised zone in OBAC033 is considered significant as it confirms the presence of primary bedrock gold mineralisation in the Black Flag Group (BFG) sediments within the Ora Banda South Project (Figure 2). The BFG sediments have been significantly underexplored in the Western Australian Eastern Goldfields due to a historical exploration focus biased towards mafic volcanic and felsic intrusive host rocks. The recent Invincible Gold Discovery (total resource of 8.9mt @ 4.6 g/t for 1.3 moz gold) at the St Ives Gold Mining Centre, located south of Kambalda, has confirmed the gold prospectivity of the BFG sediments.
Wet sieved sample from OBAC033 (80 -81m) showing abundant pyrite and quartz veining, one metre resample
assayed 3.61 g/t Au.
Drill chip tray from OBAC033 showing altered and quartz veined Black Flag Group sediments (89 – 92m).
Hole OBAC021, which is located approximately 240m south east of OBAC033, bottomed in quartz veining within saprolitic clays with the last metre of the hole assaying 0.52 g/t Au.
Significant results from the aircore program are tabulated below.
Table 1 – Ora Banda South Project – Significant Results From Aircore Drilling
Denotes intersection at end of hole
Datum: GDA94, Zone 51. Note: Intersections are calculated with a 0.20g/t Au lower cut, no upper cut and maximum of 2m internal dilution. Aircore drill samples were collected originally as 4m composite samples from 1m downhole samples. One metre downhole samples were taken through mineralized zones. All samples were analysed for gold by Intertek Genalysis Laboratory Services via a 50g Lead Collection Fire Assay with an AAS Finish (FA50/AA). (Detection Limit – 1ppb Au)
From (m) To (m) Wi dth (m) Au (g/t) From (m) To (m) Wi dth (m) Au (g/t) OBAC014 58 6627780 315160 402.19 -60 90 44 48 4 0.28 44 45 1 0.78 85 86 1 1.17 86 87 1 0.48 87 88 1 0.50 40 41 1 1.85 OBAC020 76 6627860 315040 399.43 -60 90 56 60 4 0.23 OBAC021 91 6627860 315000 397.92 -60 90 88 91 3 0.69* 90 91 1 0.52* 40 44 4 0.26 40 41 1 0.67 68 72 4 0.17 71 72 1 0.96 OBAC027 86 6627940 314960 405.55 -60 90 52 56 4 0.21 54 55 1 0.69 OBAC032 95 6628020 314920 399.43 -60 90 76 80 4 0.19 78 79 1 0.59 75 76 1 0.39 76 77 1 0.87 77 78 1 1.39 78 79 1 0.30 79 80 1 0.30 80 81 1 3.61 81 82 1 0.27 82 83 1 0.81 83 84 1 0.55 84 85 1 0.88 85 86 1 0.76 86 87 1 0.55 90 91 1 0.20 91 92 1 2.91* 76 92 16 1.03* 404.24 -60 90 OBAC033 92 6628020 314840 398.15 -60 90 69 OBAC017 OBAC026 79 6627940 315000 OBAC015 0.31 8 48 40 90 -60 400.53 314920 6627780 90 -60 402.53 315080 6627780 90
no one metre res a mpl es taken from 56m - 60m no one metre res a mpl es
taken from 44m -48m 0.42
4 88 84
Composite Samples One Metre Resamples Hole No. Hole
Northing Easting RL Dip Azimuth
The results of the aircore drilling program are considered significant as it confirms the presence of bedrock gold mineralisation associated with zones quartz veining, sulphides and alteration in the Black Flag Group (BFG) sediments within the Ora Banda South Project.
OBAC033 is located centrally within an underexplored four kilometre long surface gold geochemical anomaly (Figure 3). Planning has immediately commenced on a dedicated drilling program to test the remainder of the surface geochemical anomaly.
Figure 3 – Ora Banda South Project Summary Plan showing surface geochemical anomalies and drilling over GSWA geology map.
With the completion of the aircore drilling program Siburan has earnt a 51% interest in the Ora Banda South Project tenements and it can now elect to acquire an additional 29% interest in the tenements (bringing Siburan Resources Ltd total interest to 80%).
Siburan managing director Mr Noel Ong said:
“This is very exciting news for shareholders of Siburan. The drilling results are a vindication of the company’s persistence to continue an exploration focus. The confirmation of primary bedrock mineralisation within the Black Fag Group is fantastic as it confirms our exploration model of discovering significant mineralisation in proven mineralised geology.
The mineralised zone is located centrally within an underexplored 4 kilometre long surface gold geochemical anomaly. The intensity of the alteration system together with this 4 kilometre strike extent of overlying coincident surface gold geochemical anomaly adds further weight to the significance of this gold target.
Planning has commenced on the next phase of exploration for the project.
Siburan continue to believe that the Kalgoorlie gold terrain is highly mineralised and a new discovery is only a matter of time for those who continue to explore.”
Authorised by: Noel Ong
For further information please refer to our website www.siburan.com.au or contact: Noel Ong
Managing Director Siburan Resources T: +61 8 9386 3600
Competent Person’s Statement
The information in this report that relates to Exploration Results, Mineral Resources or Ore Reserves is based on information compiled by Mr Bryan Alexander who is a member of the Australasian Institute of Mining and Metallurgy. Mr Alexander is a director of Archaean Exploration Services Pty Ltd, whom provide geological consulting services to Siburan Resources Limited. Mr Alexander has sufficient experience which is relevant to the style of the mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2004 Edition of the “Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Mr Alexander consents to the inclusion in this ASX Release of this information in the form and context in which it appears.
APPENDIX 1 – REPORTING OF EXPLORATION RESULTS - JORC (2012)
ORA BANDA SOUTH PROJECT
Section 1: Sampling Techniques and Data – ORA BANDA SOUTH PROJECT
Criteria JORC Code Explanation Commentary
• Nature and quality of sampling (eg 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.
• 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 (eg ‘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 (eg submarine nodules) may warrant disclosure of detailed information.
ORA BANDA SOUTH PROJECT
Air core drilling was used to obtain 1 m
samples from which 4m composites samples were submitted for analysis.
Sampling and analytical procedures
detailed in the sub-sampling techniques and sample preparation section.
Drilling techniques • Drill type (eg core, reverse circulation, open-hole hammer, rotary air blast, auger, Bangka, sonic, etc) and details (eg 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).
Aircore drilling completed by Topdrill.
Achieved hole diameter size of 104mm (4 ¼ inch).
Drill sample recovery
• Method of recording and assessing core and chip sample recoveries and results assessed.
• Measures taken to maximise sample recovery and ensure representative nature of the samples. • Whether a relationship exists between sample
recovery and grade and whether sample bias may have occurred due to preferential loss/gain of fine/coarse material.
Sample recovery size and sample
condition (dry, wet, moist) recorded.
Drilling with care (eg. clearing hole at
start of rod, regular cyclone cleaning) if water encountered to reduce incidence of wet samples.
Insufficient sample population to
determine whether relationship exists between sample recovery and grade.
Logging • 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)
• The total length and percentage of the relevant intersections logged.
Logging carried by inspection of washed
cuttings at time of drilling with all samples collected in plastic chip trays for future reference.
Sub-sampling techniques and sample
• If core, whether cut or sawn and whether quarter, half or all core taken.
• If non-core, whether riffled, tube sampled, rotary split, etc and whether sampled wet or dry. • For all sample types, the nature, quality and
appropriateness of the sample preparation technique.
No core drilling
Composite samples of 1 -4m were
collected by PVC spear in pre-numbered calico bags. Sample weight 2.5 - 3 kg. Wet samples bagged separately in plastic bags prior to placing in plastic
Criteria JORC Code Explanation Commentary • Quality control procedures adopted for all
sub-sampling stages to maximise representivity of samples.
• Measures taken to ensure that the sampling is representative of the in situ material collected, including for instance results for field
• Whether sample sizes are appropriate to the grain size of the material being sampled.
and/or polyweave bags for despatch to assay laboratory. Scoop used for wet sample collection.
All samples are pulverised utilising Essa LM1, LM2 or LM5 grinding mills
determined by the size of the sample. Samples are dried (nominal 110 degrees C), crushed and pulverized to produce a homogenous representative sub-sample for analysis. A grind quality target of 85% passing 75μm has been established and is relative to sample size, type and hardness.
One metre resamples were taken from intervals where original composite samples returned anomalous mineralisation.
Quality of assay data and laboratory tests
• The nature, quality and appropriateness of the assaying and laboratory procedures used and whether the technique is considered partial or total.
• For geophysical tools, spectrometers, handheld XRF instruments, etc, the parameters used in determining the analysis including instrument make and model, reading times, calibrations factors applied and their derivation, etc. • Nature of quality control procedures adopted (eg
standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of
accuracy (ie lack of bias) and precision have been established.
The composite samples were collected
for gold analysis work completed at Intertek Genalysis, Kalgoorlie. Following the Sample Preparation outlined in the previous section above, all samples were analysed for gold by Intertek Genalysis Laboratory Services via a 50g Lead Collection Fire Assay with an AAS Finish (FA50/AA). (Detection Limit – 1ppb Au). Samples over 0.20g/t were resampled as one metre intervals and were re-assayed using the same technique.
Gold intercepts are calculated with a
0.20g/t Au lower cut, no upper cut and maximum of 2m internal dilution.
Quality control process and internal
laboratory checks demonstrate acceptable levels of accuracy.
Verification of sampling and assaying
• The verification of significant intersections by either independent or alternative company personnel.
• The use of twinned holes.
• Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols. • Discuss any adjustment to assay data.
Internal laboratory standards are
completed as a matter of course.
Sample data was captured in the field
and data entry completed in the Company’s Perth office. Sample data was then loaded into the Company’s database and validation checks
completed to ensure data accuracy.
Location of data points
• 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.
• Specification of the grid system used. • Quality and adequacy of topographic control.
Drill holes were surveyed by handheld
GPS with horizontal accuracy (Easting and Northing values) of +-5m.
Grid System – MGA94 Zone 51.
Data spacing and
distribution • Data spacing for reporting of Exploration Results. • 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. • Whether sample compositing has been applied.
Holes were 40m - 80m spaced along
east-west drill traverses to follow-up surface gold geochemistry anomalies and historical aircore drillholes. Traverses were spaced between 40m and 80m apart.
Aircore drill samples composite range
Criteria JORC Code Explanation Commentary
structure extent to which this is known, considering the deposit type. • 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.
Traverses orientated at a high angle to
the broadly north westerly trending interpreted stratigraphic contacts and surface geochemical anomaly.
Insufficient data to determine
orientation of mineralised structures.
Sample security • The measures taken to ensure sample security. Samples were securely stored in field and transported to the laboratory by an authorised company representative or an authorised transport agency.
Audits or reviews • The results of any audits or reviews of sampling
techniques and data. No audits or reviews completed.
Section 2: Reporting of Exploration Results – ORA BANDA SOUTH PROJECT
Criteria JORC Code Explanation Commentary
Mineral tenement and land tenure status
• 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 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 ORA BANDA SOUTH PROJECT is
located 55 km north west of Kalgoorlie, Western Australia and comprises five granted prospecting licences (P16/2545 – 2546, P16/2567 – 2569) covering approximately 917 hectares.
Siburan Resources Limited is earning an
interest in the tenements via
exploration expenditure. The terms of the Ora Banda South Project Farmin Agreement are:
To earn an initial 51% interest in the
tenements Siburan Resources Ltd must undertake two work programs
comprising a minimum of 1,360m of drilling.
Siburan can earn an additional 29%
interest in the project tenements (bringing its interest to 80%) by making an option payment of $175,000 to Western Resources Pty Ltd.
If Siburan earns 80% interest then the
parties will enter an 80%/20% joint venture. Western Resources Pty Ltd will be free carried for its 20% interest to a Bankable Feasibility Study or Decision to Mine. The JV will contain normal terms, including a dilution clause for the non-contributing party. If Western
Resources chooses not to contribute, it may elect to dilute to a 2% NSR.
There is no Native Title Claim registered
in respect of the project tenure.
Exploration done by other parties
• Acknowledgment and appraisal of exploration
by other parties. In the early 1990’s Finders Gold NL completed an auger soil sampling
program over an area now covered by the southern two prospecting licences (P16/2545 – 2546). This program outlined a distinct NW-SE trending gold anomaly in the western portion of the tenement block.
In the mid 1990’s Merritt Mining NL
completed an exploration program over an area now covered by the northern
Criteria JORC Code Explanation Commentary
most three prospecting licences (P16/2567 – 2569). Exploration comprised gridding, geochemical soil sampling, interpretation of
aeromagnetic data and reconnaissance RAB drilling. The soil sampling outlined a NW trending gold anomaly contiguous with the gold anomaly outlined by Finders Gold NL directly to the SE. The RAB drilling was considered largely ineffective as the drilling terminated in a highly weathered part of the profile which was potentially gold depleted.
The two historical soil geochemistry
programs together delineated a distinct zone of anomalous gold geochemistry within the western portion of the current project area. The gold anomaly (>10ppb Au, peak 54ppb Au) trends north westerly over a strike length in excess of 4km and broadly parallels the interpreted regional lithological trends.
Several kilometres of strike of the gold
in soil anomaly remained untested by drilling and represented a high priority drill target.
Since the grant of the current project
tenements the Carrick Gold investigated the soil geochemical anomalies (during the period 2009 – 2012) with a program of 31 aircore drill holes (KWAC 035-065) on wide spaced traverses across the southern most part of the surface geochemical anomaly on P16/2545-2546. The holes were drilled along three separate east-west traverses. The traverses were spaced between 520m and 640m apart, with holes spaced between 80m and 160m apart along the traverses. This first pass wide spaced program successfully returned significant gold results KWAC055 and KWAC056 which tested the southern part of the historical gold soil anomaly. These holes returned the following intersections:
KWAC 055 – 5m @ 1.54g/t from 116m
down hole (at end of hole). This intersection was associated with a strongly foliated, intense carbonate-silica altered, quartz sulphide veined felsic volcanic /volcaniclastic – sediment at the end of hole.
KWAC 056 – 2m @ 2.00/t from 68m down
hole associated with a moderately weathered, strongly iron stained felsic volcanic / volcaniclastic.
The significant intercepts from the
aircore program were followed by a program of 4 RC holes. These holes were poorly sited and failed to provide a test of the gold mineralised structure intersected in the aircore drilling.
During the period 2013 – 2014 Phoenix
Criteria JORC Code Explanation Commentary
database updates, geological research and 3D Common Earth Modelling.
In 2015 Siburan Resources Ltd entered
into an option agreement with Western Resources Pty Ltd. To date Siburan Resources Ltd has completed one diamond hole and the current aircore drilling program.
Geology • Deposit type, geological setting and style of
mineralisation. Target is shear hosted gold mineralisation associated mineralised
structures with the Black Flag Group sediments.
Drill hole Information
• 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.
• If the exclusion of this information is justified on the basis that the information is not Material and this exclusion does not detract from the understanding of the report, the Competent Person should clearly explain why this is the case.
Drill hole locations are shown on the
plan attached in this release.
All drill holes were drilled angled at 60%
towards the east and drilled to blade refusal.
Data aggregation methods
• In reporting Exploration Results, weighting averaging techniques, maximum and/or minimum grade truncations (eg 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.
Intercepts are reported as down-hole
length and average gold intercept are calculated with a 0.20g/t Au lower cut, no upper cut and maximum of 2m internal dilution.
No metal equivalent values or formulas
used. Relationship between mineralisation widths and intercept lengths
• 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 (eg ‘down hole length, true width not known’).
All results are based on whole
down-hole metres. True width not known.
Diagrams • 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.
Appropriate summary diagrams with
Scale and MGA 94 coordinates are included in the accompanying report above.
Balanced reporting• 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.
Diagrams show all drill holes completed.
Criteria JORC Code Explanation Commentary
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.
Historical soil sampling programs have
defined a NW trending gold anomaly which is broadly coincident with the interpreted trends of the local stratigraphic contacts.
Further work • The nature and scale of planned further work (eg 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 sensitive.
Planning has commenced on a dedicated
drilling program to test the remainder of the surface geochemical anomaly.