Wildcat

Past Producer in Alaska, United States with commodities Gold, Copper, Bismuth, Antimony

Geologic information

Identification information

Deposit ID 10001575
MRDS ID A012327
Record type Site
Current site name Wildcat
Related records 10209659

Geographic coordinates

Geographic coordinates: -131.67066, 55.35585 (WGS84)
Relative position The Wildcat mine is at an elevation of about 700 feet, about 1.15 miles southeast of the dam at the outlet of Carlanna Lake. The site is in section 24, T. 75 S., R 90 E., of the Copper River Meridian. It corresponds to loc. 63 in Elliott and others (1978). The location is accurate within about 0.2 mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Secondary
Bismuth Secondary
Antimony Secondary

Materials information

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

Alteration

  • (Local) The wallrock adjacent to the vein is impregnated with sulfides.

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -131.67066, 55.35585

Comments on the geologic information

  • Geologic Description = This part of Revillagigedo Island is underlain mainly by marine, pelitic sedimentary rocks and andesitic or basaltic volcanic rocks that are intruded by Cretaceous stocks, sills, and dikes of feldspar-porphyritic granodiorite, and by a stock and probably related plugs of Tertiary gabbro (Berg and others, 1988). The strata were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. They subsequently were contact metamorphosed to hornblende hornfels: locally, near some of the Cretaceous granodiorite contacts, and, more widely, peripheral to the Tertiary gabbro. The premetamorphic age range of the strata is uncertain. Berg and others (1988) note that they closely resemble Upper Jurassic to mid-Cretaceous flysch and volcanic rocks nearby on Gravina Island. The country rocks are cut by a high-angle fault along Tongass Narrows that displays about 4 miles of right-lateral offset.? the Wildcat deposit consists of two sets of quartz fissure veins in a dioritic dike or sill (called syenite by Wright and Wright, 1908, p. 151-152) that cuts black slate-phyllite (Brooks, 1902, p. 61-62, Cobb and Elliott, 1980, p. 112). The older set, which is roughly parallel to the foliation of the slate-phyllite, contains pyrrhotite. The younger set, which crosscuts the metamorphic foliation, includes the principal vein, which contains free gold, pyrite, and minor chalcopyrite. This vein is up to about 16 inches thick, and was traced on the surface for more than 900 feet. The country rock adjacent to the vein contains disseminated sulfide minerals and, possibly, gold values. The prospect was explored in the early 1900s by opencuts and short tunnels and shafts. A 5-ton test shipment made at that time reportedly contained 1.0-1.5 ounce Au/ton; some gold probably was recovered from this shipment.? According to Brooks (1902, p. 61), a nearby [quartz fissure] vein carries pyrite and pyrite, and reportedly, antimony and bismuth.
  • Age = Cretaceous or younger.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Mining district

District name Ketchikan

Comments on the production information

  • Production Notes = A 5-ton test shipment made in the early 1900s reportedly contained 1.0-1.5 ounce Au/ton; some gold probably was recovered from this shipment.

Comments on the workings information

  • Workings / Exploration = The prospect was explored in the early 1900s by opencuts and short tunnels and shafts. A 5-ton test shipment made at that time reportedly contained 1.0-1.5 ounce Au/ton; some gold probably was recovered from this shipment.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012327
USGS Alaska Resource Data File ARDF KC066

Bibliographic references

  • Deposit

    Brooks, A.H., 1902, Preliminary report on the Ketchikan mining district, Alaska, with an introductory sketch of the geology of southeastern Alaska: U.S. Geological Survey Professional Paper 1, 120 p.

  • Deposit

    Wright, F.E., and Wright, C.W., 1908, The Ketchikan and Wrangell mining districts, Alaska: U.S. Geological Survey Bulletin 347, 210 p.

  • Deposit

    Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.

  • Deposit

    Cobb, E.H., and Elliott, R.L., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 80-1053, 154 p.

  • Deposit

    Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map MF-1807,27 p., scale 1:250,000.

Comments on the references

  • Primary Reference = Brooks, 1902

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Deposit Other Comments = Early reports note that the Wildcat deposit is similar to the one at the Hoadley prospect (KC065).

Reporter information

Type Date Name Affiliation Comment
Reporter 02-JUL-1999 H.C. Berg U.S. Geological Survey