| | Published : December 17th, 2015 | High-Grade Gold Results Extend Wilber Lode |
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| High-Grade Gold Results Extend Wilber Lode | |
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DRM Wilber_Nth_UGDD_results_nov2015
ASX Announcement
18 November 2015
HIGH-GRADE RESULTS FROM ANDY WELL HIGHLIGHT ADDITIONAL WILBER LODE MINE LIFE POTENTIAL
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High-grade gold mineralisation intersected at Wilber North
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Results of 3.7m @ 13.4g/t Au (estimated true width 1.2m) and 1.0m @ 10.8g/t Au (estimated true width 0.2m) extend Wilber Lode 50-100m north of previous drilling
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Intersections extend the northern high-grade gold pod at Wilber Deeps
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Follow-up drilling underway
Doray Minerals Limited (ASX:DRM, Doray) is pleased to announce that recent underground Diamond drilling at the Andy Well Gold Project has been successful in extending the zone of high-grade gold mineralisation to the north of the existing Wilber Lode Ore Reserve boundary, indicating the potential for further extensions to the Wilber Lode underground mine.
The high-grade Wilber Lode gold deposit was discovered at Andy Well by Doray in March 2010, has been in production since August 2013 and is currently the highest grade gold operation in Australia.
Historically, the northern edge of the Wilber Lode deposit has been defined by a cross-cutting Proterozoic dolerite dyke. Drilling undertaken as part of the recent Wilber Mineral Resource update (see ASX Release 30 September 2015) intersected high grades (1.5m @ 14.1g/t Au in WBUG0785) along the northern boundary of the Resource, however a suitable drill location was not available to enable further drill testing in this area at the time.
Following subsequent completion of underground development in the adjacent area, recent drilling has successfully intersected further high-grade gold mineralisation in a quartz lode on the northern side of the Proterozoic dyke and 50-100m north of any existing drill intersections of the Wilber Lode.
Doray's Managing Director, Mr Allan Kelly, said that the recent drilling will have a significant impact on the current interpretation and development plans for the Wilber Lode mine and appears to confirm the presence of a new coherent high-grade gold zone in the orebody.
"These results support our long held belief that the Wilber Lode mineralisation would continue north of the dolerite dyke and that it was only a matter of time before we confirmed that," Mr Kelly said.
"It appears that the high-grade gold mineralisation that has been mined to date in the northern panel at Wilber remains completely open down plunge to the north and appears to be shifting further north at depth," he added.
"This means the current Indicated Mineral Resource, and associated Ore Reserve defined for planned mining at Wilber Deeps, can be expanded to the north with the potential for a corresponding overall increase in the high-grade inventory at Andy Well".
Wilber North underground Diamond drilling
A programme of underground Diamond drilling has recently been undertaken at Wilber North, drilling from the Wilber decline. This drilling was carried out utilising an LM75 drill, with holes drilled to NQ2 size. Two Diamond holes were drilled for 908m in total. This drilling is part of the first continuous and concerted in-mine exploration effort at Andy Well planned for the 2016 financial year. Drilling was targeting the northern boundary of the Wilber Lode which comprises the current Inferred Mineral Resource outline (see Figure 1).
The current interpretation is that high-grade gold mineralisation within the Wilber Lode exhibits an overall northerly plunge, and would cross over to the northern side of the cross-cutting dolerite dyke.
This recent drilling successfully intersected typical Andy Well-style mineralisation, with high-grade gold hosted in a quartz vein within sheared high-magnesium basalt. Mineralisation is typical of that being currently mined by underground methods at Wilber. Both intersections contained significant visible gold, with the intersection in WBUG0911 also exhibiting extensive galena and chalcopyrite mineralisation, which is typical of "bonanza" grade ore within the Wilber Lode. The variance in true widths is also typical of the Wilber Lode orebody, due to extensive development of boudinage textures within the quartz lode.
Significant results received include:
Ongoing Drilling at Andy Well
Doray is maintaining a sustained exploration programme at Andy Well, with a focus on both short and long term additions to mine life. As part of this programme:
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A third underground Diamond drill rig is being mobilised to site, to allow underground Resource extensional drilling to be carried out concurrently on the Wilber, Judy and Suzie lodes.
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An extensive aircore drilling programme has recently been completed testing prospective stratigraphy to the south of the known Andy Well deposits, with another programme planned to the north in the new year.
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RC drilling programmes testing several near-mine targets within the Andy Well mining lease are also scheduled to commence late-November, continuing into the new year.
-ENDS-
For further information, please contact:
Cameron Peacock Investor Relations Doray Minerals Ltd
+61 (0)439 908 732
[email protected]
Margie Livingston
Associate
AMN Corporate
+61 (0)438 661 131
[email protected]
Doray Minerals Ltd, 18 November 2015
Figure 1. Long Section of the Wilber Lode, highlighting the recent drill results with respect to the existing Mineral Resource and previous drill coverage. (Note holes WBUG0782, WBUG0785 and WBUG0785A are detailed in the ASX Release dated 18 May 2015)
ASX:DRM
About Doray Minerals Limited
Doray Minerals Limited is an Australian gold producer, developer and explorer with two high-grade Western Australian gold assets: the operating Andy Well Gold Project (Andy Well); and the Deflector Gold Project (Deflector), which is due to commence production in mid-2016, following completion of development and construction.
Doray has a strategic portfolio of gold exploration properties within Western Australia and South Australia and each presents multiple discovery opportunities. The Company's Board and management team has a proven track record in discovery, development, and production.
Competent Person Statement
The information in this announcement that relates to Exploration Results is based on information compiled by Mark Cossom. Mr Cossom is a full time employee of Doray Minerals Ltd and is a Member of the Australasian Institute of Mining and Metallurgy (AusIMM). Mr Cossom has sufficient experience, which is relevant to the style of mineralisation and type of deposit under consideration, and to the activities, which he is undertaking. This qualifies Mr Cossom as a "Competent Person" as defined in the 2012 edition of the 'Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves'. Mr Cossom consents to the inclusion of information in this announcement in the form and context in which it appears. Mr Cossom holds shares and options in Doray Minerals Ltd.
The information in this announcement that relates to Mineral Resources has been extracted from the Doray ASX announcement dated 30 September 2015 and is available on the Doray website at www.dorayminerals.com.au or through the ASX website at www.asx.com.au (using ticker code "DRM"). Doray confirms that, outside of those detailed in this announcement, it is not aware of any new information or data that materially affects the information included in the original market announcement and that all material assumptions and technical parameters underpinning the estimates in that market announcement continue to apply and have not materially changed. Doray confirms that the form and context in which the Competent Person's findings are presented have not been materially modified from the original market announcement.
ASX:DRM
Appendices
Table 1. Drill hole Summary Table
Hole ID
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Easting
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Northing
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RL
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Dip/Azimuth
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Total Depth
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From (m)
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To (m)
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Interval (m)
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Au Grade (g/t)
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Est. True Width (m)
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Comment
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WBUG0911
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667523.6
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7097981
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118
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-42.7/008.2
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419.7
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308.4
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312.1
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3.7
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13.40
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1.2
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309
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311
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2
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22.5
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WBUG0912
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667523.5
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7097980.9
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117.9
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-52.1/008.2
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488.3
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395
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396
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1
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10.8
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0.2
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395.7
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396
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0.3
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33.3
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Note:
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All coordinates are MGA (GDA94 Zone 50). Azimuth is Magnetic Degrees.
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Intervals reported correspond to geologically logged quartz vein intervals
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All assays are 25g Fire Assay assayed at Minanalytical Laboratories, Perth
JORC Code 2012 Edition Summary (Table 1) - Wilber Nth Deeps UG DD 2015
Section 1 Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections.)
Criteria
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JORC Code explanation
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Commentary
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Sampling techniques
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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.
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Diamond core (NQ2) sampled whole core, 0.3m to 1.2m. Whole core has been selected at Wilber due to the level of geological understanding around mineralisation not requiring the need to retain a library sample, and the greater sample size gained from whole core analysis with respect to assay repeatability
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Mineralisation determined qualitatively through: presence of sulphide in quartz; internal structure (massive, brecciated, laminated) of quartz.
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Mineralisation determined quantitatively via fire assay.
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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.
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Diamond core samples crushed to 2mm and pulverized to 75µm.
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All samples analysed by 25g Fire Assay and AAS finish
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When visible gold is observed in Diamond core, this sample is flagged by the supervising geologist and a lab barren quartz flush is requested following the high grade sample. The quartz wash material is assayed and reported by the laboratory.
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Blank sample material is submitted immediately following suspected mineralised samples
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Drilling techniques
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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).
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Drill sample recovery
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Criteria
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JORC Code explanation
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Commentary
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Logging
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Qualitative: lithology, alteration, foliation
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Quantitative: vein percentage; mineralization (sulphide) percentage; RQD measurement; assayed for gold.
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Drill core is photographed both wet and dry.
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Sub-sampling techniques and sample preparation
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If non-core, whether riffled, tube sampled, rotary split, etc and whether sampled wet or dry.
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Quality of assay data and laboratory tests
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Fire assay (25g), total technique, appropriate for gold
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AAS determination, appropriate for gold.
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OES for other elements.
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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.
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Criteria
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JORC Code explanation
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Commentary
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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.
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Certified reference material standards, 1 in 40 samples, 0.34 to 9.25 ppm, total 371 submitted, results considered acceptable.
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Blanks: A lab barren quartz flush is requested following a predicted high grade sample (i.e. visible gold). Results for the quartz flush material are reported.
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Blank samples are submitted to the laboratory following suspected mineralized samples
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Duplicates:
o Lab: Random pulp duplicates are taken on average 1 in every 10 samples
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Verification of sampling and assaying
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All sampling is routinely inspected by senior geological staff. Significant intersections are inspected by senior geological staff and DRM corporate staff.
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2% of samples returned > 0.1g/t Au are sent to an umpire laboratory on a quarterly basis for verification.
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Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols.
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Data stored in Datashed database on internal company server, logging performed on LogChief and synchronised to Datashed database, data validated by database administrator, import validate protocols in place. Visual validation in Surpac by company geologists.
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Location of data points
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Data spacing and distribution
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Criteria
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JORC Code explanation
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Commentary
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Orientation of data in relation to geological structure
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Sample security
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All samples are selected, cut and bagged in a tied numbered calico bag, grouped into larger polyweave bags and cable tied. Polyweave bags are placed into larger bulky bags with a sample submission sheet and tied shut. Consignment note and delivery address details are written on the side of the bag and delivered to Toll Express in Meekatharra. The bags are delivered directly to MinAnalytical in Canning Vale, WA who are NATA accredited for compliance with ISO/IEC17025:2005.
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Audits or reviews
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Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section.)
Criteria
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JORC Code explanation
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Commentary
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Mineral tenement and land tenure status
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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.
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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.
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M51/870 is 100% owned by Andy Well Mining Ltd, which is a wholly owned subsidiary of DRM. M51/870 is located within the Yugunga- Nya Native Title Claim.
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M51/870 Heritage surveys have been conducted over active mining and exploration areas
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M51/870 is valid until 2033
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Exploration done by other parties
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Historic exploration was carried out on Wilber by Dominion Mining, Western Mining Corporation and Australasian Gold Mines, including geophysics, soil mapping and sampling, and drilling.
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Geology
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Drill hole Information
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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:
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easting and northing of the drill hole collar
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elevation or RL (Reduced Level - elevation above sea level in metres) of the drill hole collar
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dip and azimuth of the hole
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down hole length and interception depth
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hole length.
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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.
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Data aggregation methods
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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.
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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.
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The assumptions used for any reporting of metal equivalent values should be clearly stated.
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No top-cuts have been applied when reporting results.
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First assay from the interval in question is reported (i.e. Au1).
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Aggregate sample assays were calculated using a length weighted average
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Intercepts are reported on a geological basis (i.e. where quartz veining is present).
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No metal equivalent values are used for reporting exploration results
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Criteria
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JORC Code explanation
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Commentary
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Relationship between mineralisation widths and intercept lengths
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These relationships are particularly important in the reporting of Exploration Results.
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If the geometry of the mineralisation with respect to the drill hole angle is known, its nature should be reported.
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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').
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Drill holes oriented depending on available underground platforms for drilling. True widths have been calculated and reported to assist in interpretation.
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Strike of Wilber Lode is 45° dipping to the west at 80°
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Diagrams
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Balanced reporting
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Other substantive exploration data
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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.
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Further work
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The nature and scale of planned further work (eg tests for lateral extensions or depth extensions or large-scale step-out drilling).
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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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Gold and Silver Prices for these countries : Australia | All
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Doray Minerals Limited
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EXPLORATION STAGE |
CODE : DRM.AX |
ISIN : AU000000DRM6 |
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ProfileMarket IndicatorsVALUE : Projects & res.Press releasesAnnual reportRISK : Asset profileContact Cpy |
Doray Minerals is a exploration company based in Australia. Its main exploration properties are MEEKATHARRA NORTH, MINGAH, MAGNET NORTH, LAKE MAGENTA, ABBOTTS, WESTERN QUEEN, NUCKULLA HILL and HICKS in Australia. Doray Minerals is listed in Australia. Its market capitalisation is AU$ 117.8 millions as of today (US$ 85.0 millions, € 80.8 millions). Its stock quote reached its highest recent level on November 26, 2010 at AU$ 1.70, and its lowest recent point on December 08, 2017 at AU$ 0.16. Doray Minerals has 357 089 984 shares outstanding. |
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