Dickey Copper Co.

Site Name

Primary: Dickey Copper Co.
Secondary: Mason & Gleason Co.

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Commodity

Primary: Gold
Primary: Copper
Secondary: Lead
Secondary: Zinc
Secondary: Silver
Secondary: Cobalt

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Location

State: Alaska
District: Copper River

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

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

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Physiography

Not available

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Mineral Deposit Model

Model Name: Massive sulfide, Besshi (Japanese deposits)

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Orebody

Not available

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Structure

Not available

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Alterations

Not available

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Rocks

Not available

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Analytical Data

Not available

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Materials

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

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Comments

Comment (Deposit): Model Name = Besshi massive sulfide (Cox and Singer, 1986: model 24b)

Comment (Production): Production Notes = 29,346 pounds of copper was produced, mainly in 1917.

Comment (Exploration): Status = Inactive

Comment (Geology): Age = Probably Tertiary based on the age of the host rocks (Crowe and others, 1992).

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

Comment (Reserve-Resource): Reserves = Moffit and Fellows (1950) report that geophysical prospecting suggests that the mines in this area (CV028 and CV029) contain additional undiscovered mineral resources.

Comment (Workings): Workings / Exploration = The mine was active in the period 1910-1913, but most of the production was in 1917 (Moffit and Fellows, 1950). Two principal adits at 470 ft. and 540 ft. were connected by raises. There reportedly were additional cross cuts and drifts (Moffit and Fellows, 1950). Jansons and others (1984) report four adits having the following lengths: 500 ft., 125 ft., 35 ft. (caved), and 10 ft. There was some industry reevaluation in 1986 (B. Ellis, personal commun., 2000).? Jansons and others (1984) report the following analyses: Five grab samples from the 500 ft. adit contained 0.01% to 1.23% Cu, 0.02% to 1.5% Zn, <0.03 ppm to 12.5 ppm Au, <0.01 ppm to 28 ppm Ag, and 0.01 to 0.13% Pb. A selected grab sample contained 15.5 ppm Au. Five grab samples from the 125-ft.-long adit contained 0.3% to 4.3% Cu, 1.43% to 14% Zn, <0.03 ppm to 5.25 ppm Au, 25 to 26 ppm Ag, 80 ppm to 0.13% Pb, and 14 ppm to 740 ppm Co. A grab sample from the crosscut contained 1.6% Cu, 3.1% Zn, 2.8 ppm Au and 10 ppm Ag. A 262-pound bulk sample from the ore bunkers contained 8.65% Cu, 9.6% Zn, 0.072 oz. Au/ton, 0.62 oz. Ag/ton, and 0.04% Co.

Comment (Geology): Geologic Description = This deposit consists of sulfide-bearing quartz-calcite veins in 6- to 8-foot-wide shear zones in slate and graywacke of the Tertiary Orca Group (Nelson and others, 1985). The sulfide minerals include chalcopyrite, pyrite, pyrrhotite, and sphalerite.? the mine was active in the period 1910-1913, but most of the production was in 1917 (Moffit and Fellows, 1950). Two principal adits at 470 ft. and 540 ft. were connected by raises. There reportedly were additional crosscuts and drifts (Moffit and Fellows, 1950). Jansons and others (1984) report four adits having the following lengths: 500 ft., 125 ft., 35 ft. (caved), and 10 ft. There was some industry reevaluation in 1986 (B. Ellis, personal commun., 2000).? Jansons and others (1984) report the following analyses: Five grab samples from the 500 ft. adit contained 0.01% to 1.23% Cu, 0.02% to 1.5% Zn, <0.03 ppm to 12.5 ppm Au, <0.01 ppm to 28 ppm Ag, and 0.01 to 0.13% Pb. A selected grab sample contained 15.5 ppm Au. Five grab samples from the 125-ft.-long adit contained 0.3% to 4.3% Cu, 1.43% to 14% Zn, <0.03 ppm to 5.25 ppm Au, 25 to 26 ppm Ag, 80 ppm to 0.13% Pb, and 14 ppm to 740 ppm Co. A grab sample from the crosscut contained 1.6% Cu, 3.1% Zn, 2.8 ppm Au and 10 ppm Ag. A 262-pound bulk sample from the ore bunkers contained 8.65% Cu, 9.6% Zn, 0.072 oz. Au/ton, 0.62 oz. Ag/ton, and 0.04% Co.

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References

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): 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): Moffit, F.H. , and Fellows, R.E. , 1950, Coper deposits of the Prince William Sound district, Alaska; Geological Survey Bullentin 963-B, p. 47-80.

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.

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