ONTARIO – Wallbridge Mining and Northern Sun Mining (formerly Liberty Mines) have signed a deal whereby the ore from Wallbridge’s Broken Hammer mine on the north range of the Sudbury Basin will be custom milled at Northern Sun’s Redstone concentrator in Timmins. Wallbridge was unable to come to contract terms with a mill closer to the project, despite Xstrata Process Support conducting a metallurgical study on material from the mine.
Wallbridge says the Broken Hammer ore will be processed in a separate circuit in the mill, a situation that saves the cost of a sample tower on site. The Redstone mill has a gravity concentrator that will recover precious metals, particularly given the extremely coarse grained sperrylite (a dense platinum mineral) present in the ore. These considerations, plus expected better metal recoveries, should offset the additional transportation costs from Sudbury to Timmins.
The probable reserve at Broken Hammer is 205,000 tonnes grading 0.92% Cu, 0.10% Ni, 2.07 g/t Pt, 1.89 g/t Pd, 0.63 g/t Au and 6.64 g/t Ag. There is also 1.6 million tonnes of waste rock, putting the stripping ratio at 7:8. The property has 259,000 tonnes of indicated resources at 0.88% Cu, 0.10% Cu, 2.32 g/t Pt, 2.10 g/t Pd, 0.77 g/t Au and 6.95 g/t Ag.
The Broken Hammer project is one of several Wallbridge is pursuing in the Sudbury area. Learn about all of them at WallbridgeMining.com.