THE BOURSE WHISPERER: Blackham Resources (ASX: BLK) has completed preliminary feasibility metallurgical testwork and Process Design Criteria (PDC) at the company’s Matilda gold project in Western Australia.
The completed work is the company’s second phase of metallurgical study.
The independent PDC report has concluded the overall plant recovery based on the Matilda mining scoping study feed profile was 92.8 per cent.
Blackham said this figure was much better than the 89.9 per cent average recovery it was expecting that had been assumed in a scoping study the company completed last year.
PDC project summary and testwork results. Source: Company announcement
Blackham conducted the pre-feasibility investigation 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.
Blackham said the work conducted in the Pre-Feasibility had supported its scoping testwork results by increasing the confidence through further work on flowsheet validation and variability testing including comminution (crushing and grinding) characteristics.
The outcome the company has taken from the program is that it suggests the resource could be economically treated using standard Gravity Concentration / Carbon in leach (CIL) cyanidation technology.
Blackham indicated it considers the PDC report to also be 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 it may currently have under consideration.
Additional metallurgical work will be done in conjunction with a 30,000m drilling program Blackham currently has underway at the Matilda project in preparation for future feasibility studies.
“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,” Blackham Resources managing director Bryan Dixon said in the company’s announcement to the Australian Securities Exchange.
“This is another significant step in de-risking the Matilda gold project.”