Brewster; Brewster Quartz Mine, Hope Mining District, Kenai Peninsula Borough, Alaska, USAi

Regional Level Types
Brewster; Brewster Quartz Mine	Mine
Hope Mining District	Mining District
Kenai Peninsula Borough	Borough
Alaska	State
USA	Country

The deposit offers no encouragement for further development (Wimmler, 1926).
Location: The mine is at an elevation of 1,750 feet, on Groundhog Creek, about a half-mile from the confluence of Bench Creek. It is in the E1/2 or NE1/4 section 27, T. 7 N., R. 1 W., of the Seward Meridian. A one-mile trail reportedly exists from the confluence to the workings. This location is accurate to within 300 feet. This is location 34 of Cobb and Richter (1972), location 23 of MacKevett and Holloway (1977), location 35 of Cobb and Tysdal (1980), and location S-271 of Jansons and others (1984).
Geology: The host rock at the Brewster mine is slate and graywacke of the Valdez Group of Late Cretaceous age (Cobb and Tysdal, 1980). Bedding of the sedimentary country rock strikes S20W. This deposit consists of discontinuous sulfide-bearing pods and stringers of quartz that are localized along a fault that strikes N15 to20E and dips vertically. The hanging wall of the fault is slate and the footwall is graywacke. The quartz in the wider pods is coarsely crystalline and includes small cavities lined with interlocking quartz crystals. The sulfide minerals are sparse and include chalcopyrite, galena, sphalerite, and pyrite. Some specimens contain visible gold, and select ore yields some free gold on panning (Wimmler, 1926). Workings consist of a 65-foot adit and a 10-foot drift. A small prospector mill was erected on the site in 1926.
Workings: Workings consist of a 65-foot adit and a 10-foot drift. The adit bears N20W and the drift bears N70W (Wimmler, 1926). A small prospector mill was erected on the site in 1926. The mill consisted of a laboratory-size jaw crusher, an Ellis Independence ball mill, and an amalgamator. A two-horsepower gasoline engine provided the power to run the mill. No assay results are reported, although in 1926 ten tons of ore was estimated to contain $150 of gold (Wimmler, 1926) or about 5 to 10 ounces of gold (Jansons and others, 1984). The U.S. Bureau of Mines searched for the prospect in 1980 and 1982 but did not find it (Hoekzema and Sherman, 1983).
Age: Cretaceous or younger; the veins cut rocks of the Valdez Group of Late Cretaceous age.
Production: Reported production is 5 to 10 ounces of gold (Jansons and others, 1984).

Commodities (Major) - Au; (Minor) - Cu, Pb, Zn
Development Status: Yes; small
Deposit Model: Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)

Other Databases

Link to USGS - Alaska:	SR158

Other Regions, Features and Areas containing this locality

References