Brewer Alaska; Brewster; Mile Seven; Sevenmile Prospect, Seward Mining District, Kenai Peninsula Borough, Alaska, USAi

Regional Level Types
Brewer Alaska; Brewster; Mile Seven; Sevenmile Prospect	Prospect
Seward Mining District	Mining District
Kenai Peninsula Borough	Borough
Alaska	State
USA	Country

The gold to silver ratio in the eight samples collected by the U.S. Bureau of Mines is 1:1 (Hoekzema and Sherman, 1983). An indicated resource with a 1:1 gold to silver ratio is suspect.
Location: The prospect is located in the SW1/4 section 26, T. 2 N., R. 1 W., of the Seward Meridian. It is situated on the east side of Lost Creek at an elevation of about 1,400 feet. This is location 85 of Cobb and Tysdal (1980) and location S-205 of Jansons and others (1984). Cobb and Tysdal (1980) summarized this prospect under the name Mile Seven. This location is accurate to within a quarter of a mile.
Geology: The prospect consists of a 12- to 20-inch-wide quartz-calcite vein that is discontinuously traceable for at least 300 feet. The vein generally parallels the north-south strike of the bedrock and dips steeply to the east (Hoekzema and Sherman, 1983). It is vuggy and has a well-developed ribbon structure. Metallic minerals included arsenopyrite, galena, sphalerite, and gold. The host rock is a blue-black slate of the Valdez Group of Late Cretaceous age (Tysdal, 1978 [MF-880-A]). Workings on the prospect consist of three adits totalling 220 feet in length. The main adit is at an elevation of about 1,400 feet; it consists of a 60-foot crosscut and 110 feet of drift with some stoping. Two short adits with winzes are located about 250 and 750 feet south of the main adit. Improvements included a 2-stamp mill and several cabins (Johnson, 1914 [B 592-G, p. 237-243]). There is no reported production. Eight assay samples contained between less than 0.1 ppm and 28.5 ppm gold (Hoekzema and Sherman, 1983).
Workings: Workings consist of three adits totalling 220 feet in length. The main adit is at an elevation of about 1,400 feet; it consists of a 60-foot crosscut and 110 feet of drift with some stoping. Two short adits with winzes are located about 250 and 750 feet south of the main adit. Improvements included a 2-stamp mill and several cabins (Johnson, 1914 [B 592-G, p. 237-243]). Eight assay samples taken from the main adit and near the portals of the two short adits, contained between less than 0.1 ppm and 28.5 ppm gold (Hoekzema and Sherman, 1983).
Age: Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.
Reserves: The U.S. Bureau of Mines estimated 1,100 tons of ore containing 0.3 ounce of gold per ton and 0.3 ounce of silver per ton ( Hoekzema and Sherman, 1983).

Commodities (Major) - Ag, Au; (Minor) - Pb, Zn
Development Status: Undetermined.
Deposit Model: Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)

Other Databases

Link to USGS - Alaska:	SR278

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References