Reynolds-Alaska Development Co.

The Reynolds-Alaska Development Co. is a copper and zinc 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
Primary: Zinc
Secondary: Silver

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: Past Producer
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: Sphalerite
Ore: Pyrrhotite
Ore: Chalcopyrite

Comments

Comment (Geology): Geologic Description = The country rocks at this mine are mafic volcanic rocks and sedimentary rocks of the Tertiary Orca Group (Nelson and others, 1985). The deposit consists of massive sulfide lenses, and sulfide veins, disseminations, and thin selvages in shear zones (Jansons and others,1984). The sulfide minerals are chalcopyrite, pyrrhotite, and sphalerite. The ore minerals are restricted to north-trending and steeply-dipping shears at the contact of volcanic and sedimentary rock.? Grant and Higgins (1909) report that some large beach boulders were shipped as ore. Chip samples collected in the 1980s contained 0.6 to 1.7% Cu, 225 ppm to 0.61% Zn, and 2.4 ppm to 8.9 ppm Ag; grab samples contained 60 ppm to 6% Cu, 67 ppm to 1.7% Zn, and 1.1 ppm to 13 ppm Ag (Jansons and others, 1984).

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

Comment (Production): Production Notes = 215,000 lbs. Cu were recoverd from 2,850 tons of ore (Jansons and others, 1984).

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

Comment (Reserve-Resource): Reserves = Inferred reserves of 600 tons @ 1.37% Cu, 0.28% Zn, and 6.67 ppm Ag (Jansons and others, 1984).

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

Comment (Workings): Workings / Exploration = The mine was developed in the early 1900s by 2100 feet of drifts (main tunnel), numerous crosscuts, winzes and raises, and at least 500 ft. of additional tunnels (Capps and Johnson, 1915). One 200 ft. tunnel was caved by the early 1980s (Jansons and others, 1984). Grant and Higgins (1909) report that some large beach boulders were shipped as ore. Chip samples collected in the 1980s contained 0.6 to 1.7% Cu, 225 ppm to 0.61% Zn, and 2.4 ppm to 8.9 ppm Ag; grab samples contained 60 ppm to 6% Cu, 67 ppm to 1.7% Zn, and 1.1 ppm to 13 ppm Ag (Jansons and others, 1984).

Comment (Exploration): Status = Inactive

References

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

Reference (Deposit): Grant, U.S., and Higgins, D.F., Jr., 1909, Copper mining and prospecting on Prince William Sound: U.S. Geological Survey Bulletin 379-C, p. 87-96.

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): 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): 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.

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): 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.

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