The testwork will utilise a 25kg composite sample from previous drilling to complete thermogravimetric analysis, roast tests, and roast product water leaching analysis for blends of the Oxley ultrapotassic microsyenite with various salts.
The aim of the initial program will be to analyse the optimal conditions of individual salt blends to convert potassium into a leachable form for extraction from potash feldspar that comprises up to 90% of the Oxley ultrapotassic microsyenite.
Amec Foster Wheeler will oversee the program which is expected to be completed over the next three months.
Centrex has also gained all required approvals to complete a single PQ diamond hole to provide a bulk metallurgical sample for subsequent larger scale testwork including pressure leach trials.
The drill hole will twin the top 50m of historical RC drill hole OXRCOI5. The drilling is aimed for completion by August. Historical drilling results were previously reported by Centrex.
