Mountain View: Fish Creek nos. 1, 2, and 3

Past Producer in Alaska, United States with commodities Silver, Gold, Copper, Molybdenum, Lead, Tungsten, Zinc, Barium-Barite, Uranium

Geologic information

Identification information

Deposit ID 10308879
MRDS ID A012286
Record type Site
Current site name Mountain View: Fish Creek nos. 1, 2, and 3
Alternate or previous names Skookum, Gray Copper, Ruby Silver
Related records 10001539

Geographic coordinates

Geographic coordinates: -130.05075, 55.98477 (WGS84)
Relative position The Mountain View group of claims lies mainly at an elevation of 500-600 feet between Skookum and Fish creeks just above their junction, but in part below it. The site is in section 11, T. 68 S., R. 99 E., of the Copper River Meridian. It mainly represents the Fish Creek nos. 1, 2, and 3 claims, which cover the main workings, called the 'Skookum tunnel' (Byers and Sainsbury, 1956, pl. 8). These claims also cover the 'Gray Copper' and 'Ruby Silver' veins, located at about 900-1000 feet elevation near the north end of the claim group (Maas and others, 1995, p. 262). The site corresponds to loc. 1 on plate 2 in Buddington (1929 [B 807]); to plate 11 in Byers and Sainsbury (1956); and to loc. 6 in Elliott and others (1978). The location is accurate within 0.2 mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Molybdenum Primary
Lead Primary
Tungsten Primary
Zinc Primary
Barium-Barite Secondary
Uranium Secondary

Comments on the commodity information

  • Ore Material = unidentified radioactive mineral

Materials information

Materials Type of material
Anglesite Ore
Azurite Ore
Barite Ore
Chalcopyrite Ore
Covellite Ore
Freibergite Ore
Galena Ore
Gold Ore
Hematite Ore
Magnetite Ore
Malachite Ore
Marcasite Ore
Molybdenite Ore
Pyrite Ore
Pyrrhotite Ore
Scheelite Ore
Silver Ore
Sphalerite Ore
Ankerite Gangue
Calcite Gangue
Chlorite Gangue
Quartz Gangue
Sericite Gangue

Alteration

  • Oxidation and supergene enrichment of some copper, silver, lead, and uranium minerals.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -130.05075, 55.98477

Comments on the geologic information

  • Geologic Description = The country rocks in the area of this site include: pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or Triassic Hazelton Group; recrystallized granodiorite of the Triassic Texas Creek Granodiorite, which intrudes the Hazelton rocks; quartz monzonite and granodiorite of the Hyder Quartz Monzonite batholith, which intrudes the Hazelton and Texas Creek rocks; and Tertiary lamprophyre dikes, which intrude all of the foregoing rock units (Buddington, 1929; Smith, 1973, l977; Berg and others, 1988). The deposits consist of quartz fissure veins in (Texas Creek) granodiorite and Hazelton metasedimentary rocks (Buddington, 1929, p. 63-67; West and Benson, 1955, p. 31-45; Byers and Sainsbury, 1956, p. 137-138; Cobb and Elliott, 1980, p. 78). The Texas Creek-Hazelton contact is a north-trending, high-angle fault that runs through the middle of the property; the Hazelton lays east of the fault. The veins locally are cut by dikes of aplite and granodiorite porphyry or pegmatite that probably are apophyses of the Hyder Quartz Monzonite batholith, and by lamprophyre dikes. The veins range in thickness from an inch or so to as much as 8 feet, and have been traced in surface or underground exposures for as much as 475 feet. The veins contain sulfide minerals, occasionally in massive shoots up to several inches thick, that mainly include pyrite, pyrrhotite, chalcopyrite, galena, sphalerite, and minor tetrahedrite and freibergite. Free gold and native silver have been reported, as have secondary oxides of the copper, lead, silver, and iron sulfides. A secondary, radioactive mineral, tentatively identified as uranium sulfate, occurs as a thin, yellowish coating on some of the sulfide and oxide minerals and on fracture surfaces; the primary radioactive mineral, which appears to be associated with rutile, has not been identified (West and Benson, 1955, p. 41). The Fish Creek no. 2, or Gray Copper, vein contains scheelite and barite in addition to the sulfides. Molybdenite flakes occur in some of the aplite and pegmatite dikes. On the basis of lead-isotope studies, Maas and others (1995, p. 254) established that the age of the Gray Copper vein is Eocene, and suggest that the Ruby Silver vein also is Eocene. The veins thus are roughly contemporaneous with the emplacement of the Hyder Quartz Monzonite batholith. More than 3600 feet of underground workings were driven at the Mountain View mine between 1925 and 1944, but the only ore shipments were for mill tests.
  • Age = On the basis of lead-isotope studies, Maas and others (1995, p. 254) established that the age of the Gray Copper vein is Eocene, and suggest that the Ruby Silver vein also is Eocene. The veins thus are roughly contemporaneous with the emplacement of the Hyder Quartz Monzonite batholith.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Mining district

District name Hyder

Comments on the production information

  • Production Notes = More than 3600 feet of underground workings were driven at the Mountain View mine between 1925 and 1944, but the only ore shipments were for mill tests.

Comments on the workings information

  • Workings / Exploration = From 1925 to 1929, a total of 3600 feet of tunnels were driven at the Mountain View mine. Of these workings, 3500 feet are in the Skookum tunnel at an altitude of 540 feet. In 1944, the northwest drift of the Skookum tunnel, on the Gray Copper vein, was extended for 180 feet. The weighted average tungstic oxide (WO3) content of 43 channel samples in these workings was 1.23% across an average vein width of 1.4 feet for a strike length of 130 feet (Byers and Sainsbury, 1956, p. 137). This ore also averaged 0.1 oz. Au/ton and 6.4 oz. Ag/ton. Weighted averages of channel samples of other parts of this vein varied from 0.15-3.93% WO3. Samples of molybdenite-bearing granodiorite contained 28-1446 ppm Mo (Maas and others, 1995, p. 262, no. 426). The most highly radioactive unconcentrated vein sample contained 0.049 percent equivalent uranium, and the most intensely radioactive concentrate of vein material contained 0.398 percent equivalent uranium (West and Benson, 1955, p. 25).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF KC006
USGS Mineral Resources Data System MRDS A012286
USGS Mineral Resources Data System MRDS A012287
USGS Mineral Resources Data System MRDS A012288
USGS Mineral Resources Data System MRDS A012289

Bibliographic references

  • Deposit

    Buddington, A.F., 1929, Geology of Hyder and vicinity, southeastern Alaska, with a reconnaissance of Chickamin River: U.S. Geological Survey Bulletin 807, 124 p.

  • Deposit

    West, W.S., and Benson, P.D., 1955, Investigations for radioactive deposits in southeastern Alaska: U.S. Geological Survey Bulletin 1024-B, p. 25-57.

  • Deposit

    Byers, F.M., and Sainsbury, C.L., 1956, Tungsten deposits of the Hyder district, Alaska: U.S. Geological Survey Bulletin 1024-F, p. 123-140.

  • 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.

  • Deposit

    Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.

Comments on the references

  • Primary Reference = Buddington, 1929 (B807); Byers and Sainsbury, 1956

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)

Reporter information

Type Date Name Affiliation Comment
Reporter 28-JUN-1999 H.C. Berg U.S. Geological Survey