Wiluna Mining Corporation Ltd Stock Market Press Releases and Company Profile
Positive Matilda Metallurgical Testwork
Positive Matilda Metallurgical Testwork

Perth, Mar 1, 2013 AEST (ABN Newswire) - Blackham Resources Ltd (googlechartASX:BLK) is pleased to report the completion of the Matilda preliminary feasibility metallurgical testwork and Process Design Criteria (PDC). The completed work is the second phase of metallurgical study which was supervised and undertaken by Independent Metallurgical Operations Pty Ltd. The overall plant recovery from the process design criteria report based on the Matilda mining scoping study feed profile was 92.8%. This is significantly better than the 89.9% average recovery assumed in the Matilda scoping study announced in November 2012.

The pre-feasibility investigation was conducted to characterise the Matilda ore with the aim of determining head grade, comminution response plus testing the response to gravity separation and precious metal recovery by cyanide leaching. A total of 616 meters of diamond drill core was submitted for laboratory testing. The Pre-Feasibility work builds on the scoping testwork by increasing the confidence through further work on flowsheet validation and variability testing including comminution (crushing and grinding) characteristics.

The outcome from the programme suggests the resource could be economically treated using standard Gravity Concentration / Carbon in leach (CIL) cyanidation technology. Table 1 & 2 outline the PDC project summary and testwork results.
Table 1: Matilda PDC Summary----------------------------------------------                                  Units  Value----------------------------------------------Ore treated per year              Mtpa     1.2Plant Feed Grade, as Au, Design    g/t     2.1Overall Plant Gold Recovery         %     92.8Total Plant Production, as Au (Leach + Gravity)           oz/pa 74,900----------------------------------------------Table 2: Gravity & CIL Recoveries-----------------------------------Oxide               99.0 %Transitional        91.2 %Fresh               86.4 %-----------------------------------
The process design criteria was completed to provide Blackham with a block flow process diagram and major equipment list for a standalone gold plant at Matilda. The PDC report is also a pre-cursor and major information reference point for the consideration and evaluation of any second-hand equipment procurement, toll treatment or other plant purchase options that may be under consideration by Blackham.

The Figure 1 flowsheet (see link below) outlines the Block Flow Process Diagram which includes crushing, grinding, gravity concentration, leaching, carbon adsorption, elution, gold room, reagents, water and air.

The comminution testwork involving impact crushing work index and unconfined compressive strength testing of samples showing them to be soft across the three ore types tested. Bond suite testwork results for the master composite samples showed that both the oxide and transitional composites were soft while the fresh composite was moderately hard in comparison to typical Yilgarn ores. All of the samples tested produced low abrasion index numbers.

Additional metallurgical work will be done in conjunction with the 30,000 meter drilling program currently underway at the Matilda Project to help build additional confidence in preparation for future feasibility studies.

Blackham's Managing Director stated "We are very pleased with the results of the metallurgical testwork and the Process Design Criteria which will help us evaluate our processing options going forward. This is another significant step in de-risking the Matilda Gold Project."

To view the flowsheet and related data, please visit:
http://media.abnnewswire.net/media/en/docs/ASX-BLK-626891.pdf

About Wiluna Mining Corporation Ltd

Wiluna Mining Corporation LtdWiluna Mining Corporation (ASX:WMC) (OTCMKTS:WMXCF)  is a Perth based, ASX listed gold mining company that controls over 1,600 square kilometres of the Yilgarn Craton in the Northern Goldfields of WA. The Yilgarn Craton has a historic and current gold endowment of over 380 million ounces, making it one of most prolific gold regions in the world. The Company owns 100% of the Wiluna Gold Operation which has a defined resource of 8.04M oz at 1.67 g/t au. In May 2019, a new highly skilled management team took control of the Company with a clear plan to leverage the Wiluna Gold Operation's multi-million-ounce potential.

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Contact

Bryan Dixon
Managing Director
Blackham Resources
T: +61-8-9322-6418

Tony Dawe
Professional Public Relations
T: +61-8-9388-0944



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