Sentinal Peak

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag
Gangue minerals pyrite; stilbite

Geographic location

Quadrangle map, 1:250,000-scale FP
Quadrangle map, 1:63,360-scale D-5
Latitude 54.833
Longitude -163.35
Nearby scientific data Find additional scientific data near this location
Location and accuracy Approximate location is on the Alaska Peninsula side of Isanotski Strait, west of Sentinal Peak. Anomaly no. 48 of Christie (1974) and no. 4, of MacKevett and Holloway (1977, p. 11).

Geologic setting

Geologic description

Christie (1974) briefly examined a 4,000 ft (1.2 km) by 3,000 ft (900 m) color anomaly developed in a basalt-andesite volcanic sequence. Rocks are generally unaltered except where pyrite content is high (about 5 percent); the typical pyrite content in the anomaly is 0.1 to 1 percent. The altered rock forms narrow (+/- 20 ft, 6 m) linear zones. Fracture-controlled pyrite apparently is confined to these altered zones. No mention is made of quartz veining. Minor quartz diorite porphyry and granodiorite were seen in float in the creek on the east side of the ridge but no intrusive rocks were seen in outcrop.
Geologic map unit (-163.35198893271, 54.8321135064206)
Mineral deposit model Epithermal gold vein?
Mineral deposit model number 25?
Age of mineralization Miocene or younger
Alteration of deposit Not described.

Production and reserves

Workings or exploration Brief reconnaissance geologic mapping and collection of a few soil and silt samples. Copper, molybdenum, zinc, and gold values were not anomalous; silver ranged between 1.3 and 1.9 ppm.
Indication of production None

Additional comments

Altered area examined by W.H. White (USGS, 1990); no significant mineralization found.

References

MRDS Number A106109

References

Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reporters G.D. DuBois; F.H. Wilson
Last report date 5/6/1994