Mt. Dutton Occurrence, Aleutians East Borough, Alaska, USAi

Regional Level Types
Mt. Dutton Occurrence	Occurrence
Aleutians East Borough	Borough
Alaska	State
USA	Country

Reported quartz veining (Butherus and others, 1979) lsuggests possibility of epithermal gold vein or polymetallic vein type mineral deposits.
Location: Approximate location is about 4 km south of the summit of Mt. Dutton. Probably same location as anomaly no. 57 of Christie (1974), described as 2 mi (3.2 km) due north of King Cove landing strip. Also, no. 10 of MacKevett and Holloway (1977, p. 9).
Geology: Two color anomalies 200 by 400 ft and 3,000 by 1,200 ft (60 by 120 and 900 by 360 m) in hornfelsed volcanic rocks cut by rare diorite dikes (Christie,1974). Pyrite content (0 to 8 percent) is highest in fractured rocks, although most pyrite is disseminated rather than fracture-controlled. Diorite dikes are only weakly altered and are not mineralized. Butherus and others (1979) reported that the color anomalies south and east of Mt. Dutton consist of altered, pyritic andesite containing quartz and calcite veins.
Workings: Christie (1974) reported brief reconnaissance geologic mapping and collected silt samples, none of which showed any anomalies in copper, molybdenum, zinc, silver, or gold. Butherusand others (1979) reported rock and pan concentrate samples slightly anomalous in copper (130 ppm), lead (300 ppm), zinc (600 ppm), and silver (3.2 ppm).
Age: Miocene or younger
Alteration: Christie (1974) reported contact metamorphic effects and weak propylitic alteration.

Commodities (Major) - Ag, Cu; (Minor) - Au, Pb, Zn
Development Status: No
Deposit Model: Porphyry copper, polymetallic vein, epithermal gold vein

Other Databases

Link to USGS - Alaska:	CB005

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References