Eagle River; Mayflower Prospect, Anchorage Mining District, Anchorage, Alaska, USAi

Regional Level Types
Eagle River; Mayflower Prospect	Prospect
Anchorage Mining District	Mining District
Anchorage	Borough
Alaska	State
USA	Country

Property originally known as the Mayflower lode (Park, 1933).
Location: Prospect located near the south bank of Eagle River, 4,500 ft west-northwest of the terminus of Eagle Glacier. Accurate within 2,000 ft. Locality 7 on plate 33 of Park (1933), locality 51 of Cobb (1972), and locality 40 of MacKevett and Holloway (1977).
Geology: Mineralized quartz veins in fine-grained, massive metagraywacke of the Late Cretaceous Valdez Group. The host rock shows sheared zones that strike N 5 W and are vertical or dip about 65 NW. Several large interbedded conglomerate lenses and minor argillite are present within the graywacke. Mineralized quartz veins that are less than 1 ft thick and that can be traced for 400 ft, are found in two sheared zones 50 ft apart (Park, 1933). Quartz veins contain galena, pyrite, sphalerite, arsenopyrite, chalcopyrite, and limited malachite. Assays show 0.05 oz/ton Au and 10 to 25 oz/ton Ag (Park, 1933). Calcite veinlets found in joints of graywacke (Martin and others, 1915). The most conspicous quartz vein can be traced south of the river and probably is also exposed to the north of Eagle River.
Workings: Assays show 0.05 oz/ton Au and 10 to 25 oz/ton Ag (Park, 1933). Limited amount of work on prospect by 1933. Smith (1938) reported prospecting in 1936 - vein opened by a few open cuts with apparently encouraging results. By 1951 the prospect could not be found (White, 1952).
Age: Late Cretaceous or younger; the veins cut Late Cretaceous Valdez Group rocks.
Alteration: Oxidation of Cu minerals.

Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: None
Deposit Model: Low-sulfide Au-quartz veins ? (Cox and Singer, 1986; model 36a ? ) or Chugach-t

Other Databases

Link to USGS - Alaska:	AN113

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References