Pinnell River Occurrence, Fairhaven Mining District, Northwest Arctic Borough, Alaska, USAi

Regional Level Types
Pinnell River Occurrence	Occurrence
Fairhaven Mining District	Mining District
Northwest Arctic Borough	Borough
Alaska	State
USA	Country

Location: Pinnell River is a major north-flowing tributary to Inmachuk River. This occurrence is on the east side of the Pinnell River valley, just above the Fairhaven ditch at an elevation of 750 feet. It is 1.8 miles south of Inmachuk River.
Geology: A small orange gossan is developed in black dolomitic marble just above the Fairhaven ditch at an elevation of 750 feet. The marble is partially replaced by disseminations and stockwork veinlets of quartz and veinlets of fuchsite (Herried, 1966). A gossan sample contained 0.02 ounces/ton Au, 0.023 ounces/ton Ag, 0.05 % Cu, 0.05 % Pb, 0.05 % Zn, and 0.5 % Cr (Herried, 1966, Table 1). Most of the bedrock in the area is a metasedimentary schist and marble sequence of Lower Paleozoic age (Till and others, 1986).
Workings: Small, hand dug prospecting pits may be present.
Age: Epigenetic mineralization in metamorphic rocks of Seward Peninsula is primarily of Cretaceous age. Some lode gold deposits on southern Seward Peninsula are mid-Cretaceous in age (see Midnight Mountain, BN047).
Alteration: The occurrence is oxidized and quartz veining of marble is present.

Commodities (Major) - Au; (Minor) - Ag, Cr, Pb, Zn
Development Status: No
Deposit Model: Vein and replacement in marble ?

Other Databases

Link to USGS - Alaska:	BN064

Other Regions, Features and Areas containing this locality

References