Silvertip Creek

Mine, Active

Commodities and mineralogy

Main commodities Au
Other commodities W
Ore minerals gold; scheelite

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale C-7
Latitude 60.7291
Longitude -149.3594
Nearby scientific data Find additional scientific data near this location
Location and accuracy The placer mine is located near the east bounary of section 6 in T. 7 N., R. 1 E., of the Seward Meridian. The mine is about a mile upstream from the junction of Silvertip Creek with East Fork Sixmile Creek. This is location 146 of Cobb and Richter (1972), location169 of MacKevett and Holloway (1977), location 19 of Tysdal (1978 [MF-880-B]), location 146 of Cobb and Tysdal (1980), and location P-75 of Jansons and others (1984). This location is accurate to within 300 feet.

Geologic setting

Geologic description

The upper portion of Silvertip Creek occupies a steep, narrow, bedrock canyon partially filled with avalanche debris. The lower sections occupy a slightly wider channel, where bedrock near the surface is covered by poorly washed and stratified clay-rich gravels containing gold. The lowermost section flows over an alluvial fan consisting of moderately well stratified and washed gravels. Bedrock of the area is the Valdez Group of Late Cretaceous age (Nelson and others, 1985).
Silvertip gold has been reported to be similar to Gulch Creek gold (see SR029), but the nuggets were not so large. Most of the larger nuggets had quartz attached (Johnson, 1912). Scheelite has been found in the concentrate (Jasper, 1967).
Geologic map unit (-149.361553065075, 60.728535332612)
Mineral deposit model Placer Au (alluvial) (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration
Pick and shovel operations occurred between 1897 and 1904. In 1911, a small hydraulic operation was attempted about a mile above the point where Silvertip Creek joins East Fork Sixmile Creek (Moffit, 1906). This operation worked the shallow creek gravels, 3 to 4 feet deep, for about six weeks before the work was abandoned (Johnson, 1912). The gold was reported to be similar to that at Gulch Creek (see SR029), but the nuggets were not so large. Most of the larger nuggets had quartz attached (Johnson, 1912).
Small mechanized operations have mined sporadically since 1950 and suction dredges since 1975 (Jansons and others, 1984).
The U.S. Bureau of Mines collected one sample, which yielded .0019 ounce of gold per cubic yard (Jansons and others, 1984).
Indication of production Yes; small
Reserve estimates The inferred placer gold reserve base is estimated at greater than 1,000,000 cubic yards (Jansons and others, 1984).
Production notes The U.S. Bureau of Mines estimated the production at 750 to 1,000 ounces, of which 50 to 100 ounces are estimated to have been recovered since 1975 (Jansons and others, 1984).

References

MRDS Number A010608

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.
Reporters Jeff A. Huber (Anchorage)
Last report date 4/30/2000