Blackham Resources Limited (ASX:BLK) Positive Matilda Metallurgical Testwork.
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.
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:
About Blackham Resources Limited:
Blackham Resources Limited (ASX:BLK), a Western Australian resources company, is focused on exploration and development at the Matilda and Williamson Gold Mines in the Wiluna gold belt of Western Australia. The Matilda Gold Project contains resources of 24.5Mt @ 1.90g/t gold. The tenure package covers 50km of strike along the Wiluna Mine sequence and Coles Shear which has produced over 4Moz of gold. Blackham have the largest landholding (>500km2) in the Wiluna goldfield, one of Western Australia's major Archaean greenstone belts. Blackham aims to delineate a multi-million ounce gold resource and targeting converted resources to reserves in the near term.
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|Date:||Mar 1, 2013|
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