Fielder & Hemple

The Fielder & Hemple 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: Fielder & Hemple

Commodity

Primary: Copper
Primary: Zinc
Secondary: Gold
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: 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: Pyrite
Ore: Chalcopyrite
Gangue: Quartz

Comments

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

Comment (Geology): Geologic Description = The deposit at this prospect is in mafic volcanic and sedimentary rocks of the Tertiary Orca Group (Nelson and others, 1985). It consists of a 24-foot-wide shear zone in pillow basalts and slates that contains small masses of sulfides and quartz as well as sulfide-rich stringers. The zone is traceable for at least 1,500 feet along strike (Capps and Johnson, 1913). The sulfide minerals are chalcopyrite, pyrite, and pyrrhotite.? Sampling by Mihelich and Wells (1957) gave the following results: five chip samples from the 1200 ft. adit contained <0.1% to 1.1% Cu, <0.1 to 1.3% Zn, trace to 0.32 oz. Au/ton, and 0.02 to 0.32 oz.Ag/ton. Sampling by Jansons and others (1984) gave the following results: five chip samples contained 0.19% to 2.6% Cu, 800 ppm to 0.7% Zn, 2.6 ppm to 3.7 ppm Ag, and <0.03 ppm to 0.12 ppm Au. Selected grab samples contained 4.5% and 4.6% Cu, 1.7% and 1.8% Zn, 4.1 ppm and 13 ppm Ag, and 0.06 ppm and 3.1 ppm Au.

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

Comment (Exploration): Status = Inactive

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

Comment (Reserve-Resource): Reserves = Inferred reserves ( Mihelich and Wells, 1957) are 6,300 tons @ 1.3% Cu.

Comment (Workings): Workings / Exploration = Capps and Johnson (1913) reported four adits having the following lengths: 1200 ft., 250 ft., 65 ft., and 18 ft. There were also minor surface workings. Only two adits could be found during later exploration (Jansons and others, 1984). Sampling by Mihelich and Wells (1957) gave the following results: five chip samples from the 1200 ft. adit contained <0.1% to 1.1% Cu, <0.1 to 1.3% Zn, trace to 0.32 oz. Au/ton, and 0.02 to 0.32 oz.Ag/ton. Sampling by Jansons and others (1984) gave the following results: five chip samples contained 0.19% to 2.6% Cu, 800 ppm to 0.7% Zn, 2.6 ppm to 3.7 ppm Ag, and <0.03 ppm to 0.12 ppm Au. Selected grab samples contained 4.5% and 4.6% Cu, 1.7% and 1.8% Zn, 4.1 ppm and 13 ppm Ag, and 0.06 ppm and 3.1 ppm Au.

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): Capps, S.R., and Johnson, B.L., 1913, Mineral deposits of the Ellamar district: U.S. Geological Survey Bulletin 542, p. 86-124.

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., 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): 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): Mihelich, M., and Wells, R.R., 1957, Copper mines and prospects adjacent to Landlocked Bay, Prince William Sound, Alaska: U.S. Bureau of Mines Report of Investigations RI 5320, 21 p.

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.

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