Reynolds-Alaska Development Co.

The Reynolds-Alaska Development Co. is a copper mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Reynolds-Alaska Development Co.

Commodity

Primary: Copper
Secondary: Silver
Secondary: Zinc

Location

State: Alaska
District: Copper River

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Massive sulfide, Cyprus

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrrhotite
Ore: Chalcopyrite
Ore: Sphalerite
Gangue: Quartz
Gangue: Calcite

Comments

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Site was discovered in 1899 and by 1912 there were 900 feet of underground workings. Capps and Johnson (1915) reported assays of 11.4 to 12.5 % Cu; and 0.18 oz Au and 0.26 oz Ag per ton. Later development included four adits with about 820 ft. of underground workings and some open cuts. Three of the adits are caved or flooded (Jansons and others, 1984). Chip samples from the open cuts contained 0.18% to 8.4% Cu, 170 ppm to 0.25% Zn, and 0.8 ppm to 28 ppm Ag (Jansons and other, 1984); Grab samples gave the following values: 100 ppm to 9.75% Cu, 100 ppm to 1.05% Zn, and 0.8 ppm to 9.5 ppm Ag.

Comment (Deposit): Other Comments = Nelson and others (1985) interpret the country rocks as accreted ocean crust. Crowe and others (1992; 1993) and Sainsbury (1993) discuss the genesis of the volcanogenic massive sulfide deposits in this area.? Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.

Comment (Geology): Age = Probably Tertiary based on the age of the host rocks.

Comment (Geology): Geologic Description = The country rocks at this prospect are mafic volcanic rocks and sedimentary rocks of the Tertiary Orca Group (Nelson and others, 1985). The deposit consists of chalcopyrite, pyrrhotite, and sphalerite in a 1-to 20- foot-wide shear zone in volcanic rocks (Capps and Johnson, 1915).? Capps and Johnson (1915) reported assays of 11.4 to 12.5% Cu and 0.18 oz Au and 0.26 oz Ag per ton. Later development included four adits with about 820 ft. of underground workings and some open cuts. Three of the adits are caved or flooded (Jansons and others, 1984). Chip samples from the open cuts contained 0.18% to 8.4% Cu, 170 ppm to 0.25% Zn, and 0.8 ppm to 28 ppm Ag (Jansons and other, 1984). Grab samples gave the following values: 100 ppm to 9.75% Cu, 100 ppm to 1.05% Zn, and 0.8 ppm to 9.5 ppm Ag.

Comment (Reference): Primary Reference = Jansons and others, 1984

Comment (Reserve-Resource): Reserves = Inferred reserves of 3000 tons @ 4.6% Cu, 0.14% Zn, and 15.65% Ag (Jansons and others, 1984).

Comment (Deposit): Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a)

References

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Cordova quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-392, 1 sheet, scale 1:250,000.

Reference (Deposit): Crowe, D.E., Nelson, S.W., Brown, P.E., Shanks III, W.C., and Valley, J.W., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska-A reply: Economic Geology, v. 88, p. 1285-1288.

Reference (Deposit): Sainsbury, C.L., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska, A discussion: Economic Geology, v. 88, p. 1284-1285.

Reference (Deposit): 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.

Reference (Deposit): 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 Open-File Report 5-84, 218 p., 2 sheets, scale 1:250,000.

Reference (Deposit): Capps, S.R., and Johnson, B.L., 1915, The Ellamar district, Alaska: U.S. Geological Survey Bulletin 605, 125 p.

Reference (Deposit): Crowe, D.E., Nelson, S.W., Brown, P.E., Shanks III, W.C., and Valley, J.W., 1992, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska: Economic Geology, v. 87, p. 1722-1746.

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