Devils Mountain Occurrence, Chisana Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
Devils Mountain Occurrence	Occurrence
Chisana Mining District	Mining District
Valdez-Cordova Census Area	Census Area
Alaska	State
USA	Country

The occurrence is in the Wrangell-St. Elias National Preserve.
Location: This occurrence is on the creek draining the northwest side of Devils Mountain. It is at an elevation of about 3,100 feet, about 6,000 feet southwest of the summit of Devil Mountain. This is locality 11 of Richter and others (1975) and National Park Service locality WRST-5 (unpublished data). It was included as an 'Unnamed occurrence' by Cobb and Richter (1980). It is located to within several hundred feet.
Geology: Large boulders up to 6 feet or more in diameter of massive pyrrhotite, chalcopyrite, actinolite, and garnet occur at this locality (Richter and others, 1975). The source of these boulders is unknown. Quaternary deposits cover much of the lower areas of this drainage but a Cretaceous hornblende quartz diorite and diorite stock that intrudes upper Paleozoic metavolcanic rocks makes up most of the bedrock in the headwaters of the drainage (Richter, 1971 [I-656]; 1976).
Workings: The source of the mineralization has not been identified.
Age: Cretaceous? The parent deposit may be a skarn related to a hornblende quartz diorite and diorite stock in the headwaters of this drainage. This pluton is though to be mid-Cretaceous in age like the Nabesna pluton several miles to the south (Richter, Lanphere, and Matson, 1975).
Alteration: Calc-silicate and sulfide replacement.

Commodities (Major) - Cu
Development Status: None
Deposit Model: Cu skarn (Cox and Singer, 1986; model 18b)

Other Databases

Link to USGS - Alaska:	NB026

Other Regions, Features and Areas containing this locality

References