Nimbus, Camp Creek, Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Nimbus	Prospect
Camp Creek	Creek
Valdez Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

Some references combine this prospect with the similar Nimrod prospect (HE076) as one site.

Location: This site is at an elevation of about 2,900 feet on the south bank of Camp Creek. It is in the NW1/4 sec. 9, T. 19 S., R. 10 W., of the Fairbanks Meridian. The location is accurate to within 1,000 feet.
Geology: The country rock at this prospect consists of Upper Jurassic to Upper Triassic(?) crystal tuff, argillite, chert, graywacke, and limestone that are intruded by Upper Cretaceous quartz diorite dikes. The deposit is in brecciated dikes and consists of lenses 1 to 2 meters thick, and up to 10 meters long, of massive chalcopyrite, arsenopyrite, stibnite, pyrite, and sphalerite. The deposit is similar in mineralogy and type to the Golden Zone deposit (HE043) and satellite prospects to the southwest. Samples from arsenopyrite-rich veins contained a maximum 9.3 ppm Au and 22 ppm Ag over a width of 2.0 feet (Hawley and others, 1978).
Workings: There has been surface exploration. Samples from arsenopyrite-rich veins contained a maximum 9.3 ppm Au and 22 ppm Ag over a width of 2.0 feet (Hawley and others, 1978).
Age: The similarity of the Nimbus deposit to the Upper Cretaceous (70-65 Ma) Golden Zone deposit (HE043) suggests that they are probably the same age.
Alteration: Phyllic.

Commodities (Major) - Ag, Au; (Minor) - As, Cu, Sb, Zn
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c)

Other Databases

Link to USGS - Alaska:	HE075

Other Regions, Features and Areas containing this locality

References