Tonopah Metallurgy
Column leach testwork completed 4 composite samples ranging in grade from 0.38g/t to 1.98g/t head grade and divided by rock type.
- Coarse Crush –RC chips used as samples, crushed to 80% minus 10 mesh and agglomerated with cement
- Tests not driven to completion in 60 days – additional time needed to increase recovery
- Impact of slow-leaching free gold content noticed on recovery
- +83% recovery on argillite (Opa) sample representing ~ 50% of resource base.
- +58% recovery expected with additional time in Tertiary Volcanics
- 71% average recovery expected
- Additional testwork required to optimize process route
Metallurgical Testwork
- PQ Core (8.5 cm) drilled to produce representative metallurgical test samples
- Testing program underway at KCA lab in Reno, Nevada
- HPGR crushing testwork complete: bottle roll, column leach, stacking and agitation leach tests ongoing