In green carbonate rock, sheared syenite, volcanic rocks, talc-chlorite schist
Gold mine - produced 320 tons of gold to 1983, mine has been worked to a depth of 5000 feet.
References:
Econ Geol (1987) 82:649-690
Knipe, S. W. & M.E.Fleet, Gold-copper alloy minerals from the Kerr Mine, Ontario, Canadian Mineralogist 35,573-586(1997)