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Dunrovin

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Au
Other commodities Ag
Ore minerals pyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-6
Latitude 60.4195
Longitude -149.2196
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located on Falls Creek at an elevation of about 2,500 feet. It is situated in the SE1/4 section 23, T. 4 N., R. 1 E., of the Seward Meridian. This is location 73 of Tysdal (1978 [MF-880-A]) and location S-222 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The occurrence consists of a 6- inch- to 4-foot-wide quartz vein that can be traced for 35 feet along strike over 30 feet of elevation. The vein strikes N10W and dips 70W (Hoekzema and Sherman, 1983). Metallic minerals observed in the vein are pyrite and pyrrhotite. Bedrock in this area is slate and graywacke of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). A single grab sample contained 0.07 ppm gold and 0.5 ppm silver (Hoekzema and Sherman, 1983).
Geologic map unit (-149.221716567235, 60.4189214056736)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration A single grab sample contained 0.07 ppm gold and 0.5 ppm silver (Hoekzema and Sherman, 1983).
Indication of production None

References

References

Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000.
Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.
Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 6/15/2001