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Fielder & Hemple

Prospect in Alaska, United States with commodities Copper, Zinc, Silver, Gold
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Geologic information

Identification information

Deposit ID 10000358
MRDS ID A010423
Record type Site
Current site name Fielder & Hemple
Related records 10136812

Geographic coordinates

Geographic coordinates: -146.54254, 60.85765 (WGS84)
Relative position This prospect is at an elevation of about 700 ft. on the north side of inner Landlocked Bay, and about 0.5 mile north of VABM Dick. It is in the W1/2 sec. 6, T. 12 S., R. 7 W., of the Copper River Meridian. The site location is accurate to within 1000 ft. This location corresponds to site C-74 in Jansons and other (1984) and to #14 in Cobb (1972: MF-392).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Zinc Primary
Silver Secondary
Gold Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore
Quartz Gangue

Mineral occurrence model information

Model code 90
USGS model code 24a
Deposit model name Massive sulfide, Cyprus
Mark3 model number 11

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
    Rock unit name Orca Group;Orca Group
    Rock description Orca Group;Orca Group

Nearby scientific data

(1) -146.54254, 60.85765
ListMap

Comments on the geologic information

  • 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.
  • Age = Probably Tertiary based on the age of the host rocks.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Copper River

Comments on the reserve resource information

  • Reserves = Inferred reserves ( Mihelich and Wells, 1957) are 6,300 tons @ 1.3% Cu.

Comments on the workings information

  • 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.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010423
USGS Alaska Resource Data File ARDF CV019

Bibliographic references

  • Deposit

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

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Jansons and others, 1984

General comments

Subject category Comment text
Deposit Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
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.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-00 S.W. Nelson U.S. Geological Survey