31 October: Corvus Gold (TSX: KOR, OTCQX: CORVF) has dramatically increased gold resources at North Bullfrog project, in Nevada, after including drilling results from its 2016 and 2017 programmes.
For the 2017 estimate, the company has split the resources based on the phasing of exploitation, with an early stage, higher grade mix of predominantly oxide mill processing and oxide heap leach processing (Phase 1) being followed by exploitation of mainly heap leach mineralisation (Phase 2).
Phase 1 M&I resources amount to 35.0 Mt at a grade of 0.80 g/t gold for 904 koz of gold contained. Corvus plans to process 614 koz of this mixed oxide and sulphide resource through a mill. This is the first time that the company has included sulphide resource in its mine plans. It hopes to recover the 89 koz of sulphide material at a grade of 1.46 g/t gold in M&I resources by utilising Ambient Atmospherics Oxidation (AAO) processing. AAO testwork on this material has indicated recoveries ranging between 87% and 94%.
Phase 2 M&I resources are 123.1 Mt at a grade of 0.22 g/t gold for 855 koz of gold contained. And 86% of this material will be processed via the heap leach.