Geologic descriptionThis occurrence is one of several that define a northeast trending zone of minor copper occurrences that extends northeast for about 5 miles from VABM Allen on the Wiseman C-5 topographic map (also see WI005, 006, 013, 014, and 016). This occurrence was first described by Brosge and Reiser (1960) as copper sulfides, galena and malachite in a quartz vein in Devonian phyllite and siltstone below a thrust plate of Devonian Skajit Limestone. Nearby, Dillon and others (1981, localities 244 and 245 [AOF 133B]) sampled mineralized pebble conglomerate and cross-bedded metasandstone near a facies change from metaclastic to metacarbonate rocks. The pebble conglomerate was malachite-stained and contained disseminated chalcopyrite, sphalerite, and galena. The metasandstone contained sphalerite and abundant hematite. Samples from these two units contain up to 7,000 ppm copper, 10 ppm silver, more than 1% titanium, 70 ppm scandium, 700 ppm vanadium, 500 ppm zinc, and 100 ppm molybdenum. Kurtak and others (1999) collected two selected bedrock samples of micaceous schist and limestone and a sample of quartz-chlorite schist float that contains bornite, malachite, and possibly galena; one sample has 11% copper, 17 ppb gold, and 68.9 ppm silver. |
