At the Black Hills showing, a Proterozoic Moyie Intrusions diorite sill contains three major quartz-calcite veins. One vein strikes 255 degrees and dips 65 degrees southwest and contains blebs and disseminations of chalcopyrite, pyrite and minor galena. The other two veins intersect, with strike directions of 330 and 340 degrees respectively, and host chalcopyrite and pyrite which alters to malachite and azurite on weathered surfaces.