COB cobalt blue holdings limited

Ann: PFS - Bulk Metallurgical Testwork - Progress Update, page-3

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    PFS – Bulk Metallurgical Testwork – Progress Update

    Thackaringa Project - High purity elemental sulphur and strong recoveries of cobalt achieved in latest successful test work.

    • Cobalt Blue test work is focussed upon delivering strong cobalt recoveries that will support the world class Thackaringa cobalt project. Shareholders can expect further updates over Q1 2018.
    • Cobalt Blue Holdings (ASX:COB) has now treated 40 kg of concentrate (out of 100 kg) through the calcine furnace, and 8 kg of calcine (out of 80 kg) through the leach circuit. Work is continuing into Q1 2018 to complete the testing of the calcine and leach unit operations.
    • Leach recoveries have typically ranged from ~70% to 96%, depending on the conditions employed.
    • Recovery of elemental sulphur from the calcine furnace graded 97.5% sulphur, with no cobalt losses.
    Cobalt Blue’s Head of Feasibility Studies, Dr Andrew Tong commented: “Early stage testwork on kilograms of material, using the Cobalt Blue proprietary process, is confirming cobalt extraction from the concentrate without by-production of acid, as would be the case for a roasting process. Also, high temperature and pressure conditions are not required for leaching the calcine (artificial pyrrhotite) as practised for extracting cobalt using the common HPAL process for laterites.
 
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