Main commodities | Cu |
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Other commodities | Ag; Au; Mo |
Ore minerals | chalcopyrite; molybdenite; pyrite |
Quadrangle map, 1:250,000-scale | CG |
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Quadrangle map, 1:63,360-scale | A-3 |
Latitude | 56.048 |
Longitude | -158.769 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This mineral occurrence is insec. 2, T. 48 S., R. 61 W., of the Seward Meridian, approximately 2 miles west of Foot Bay, near the head of a small northeast-flowing drainage. The location is accurate to within 1/2 mile. |
Geologic descriptionThis site is marked by a color anomaly which occupies an area of approximately 1/2 by 1 mile along the northern contact zone of a small diorite stock (Fields, 1977). The stock intrudes siltstone, sandstone, grit, and conglomerate of the Cretaceous Hodoo Formation, which exhibits strong hornfelsing near the contact zone.
A peripheral pyrite-bearing fracture zone is present along the northern contact. The sulfide content in this zone is up to 5 percent, whereas the intrusive contains 1 percent or less sulfides (Fields, 1977). Two rock samples collected by Bear Creek Mining Company in 1976 contained values of about 230 ppm copper and 2 ppm molybdenum along with traces of lead, zinc, and precious metals. One high-grade sample collected near the contact had metal values of 2300 ppm copper, 1.9 ppm gold, 2 ppm molybdenum, and 4.6 ppm silver. | |
Geologic map unit | (-158.771011437185, 56.0472139081733) |
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Mineral deposit model | Porphyry copper; porphyry copper-molybdenum (Cox and Singer, 1986; models 17, 21a). |
Mineral deposit model number | 17, 21a |
Age of mineralization | Tertiary. |
Workings or exploration | This site was briefly examined and sampled by Bear Creek Mining Company in 1976 (Fields, 1977). Two of the rock samples contained about 230 ppm copper and 2 ppm molybdenum along with minor base and precious values. A high-grade sample collected near the contact had metal values of 2300 ppm copper, 1.9 ppm gold, 2 ppm molybdenum, and 4.6 ppm silver. |
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Indication of production | None |
Additional commentsThis mineral occurrence is located within the Alaska Peninsula National Wildlife Refuge. |
MRDS Number | A012453 |
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Reporters | S.H. Pilcher (Anchorage) |
Last report date | 2/8/2000 |