At this prospect, magnetite-rich metabasalt of the Nikolai Greenstone of Late Triassic age is intruded by quartz monzonite of Jurassic or Cretaceous age (Nokleberg and others, 1982). Numerous malachite-stained chalcopyrite-bearing quartz-carbonate veins cut the basalt. The largest of the veins is about 10 feet wide and and can be followed at least 100 feet along strike.

The veins, like the metabasalt, are rich in magnetite. Some of the veins contain a significant amount of gold; others are enriched only in copper (Kurtak and others, 1992, table A18). Selected sample 2641 of a 1.4-foot-wide magnetite-rich vein in basalt contained 1.26 ounces of gold per ton and 0.12 percent tungsten; it possibly contained scheelite. Copper-rich veins average about 2.1 percent copper; a 4.5-foot-wide magnetite-carbonate vein that could be followed for about 100 feet assayed 6.3 percent copper (sample 3212). This vein also assayed 0.81 ounce of gold per ton and 0.78 ounce of silver per ton.