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Crest

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

Identification information

Deposit ID 10000194
MRDS ID A010232
Record type Site
Current site name Crest

Geographic coordinates

Geographic coordinates: -130.06481, 56.01644 (WGS84)
Relative position The Crest prospect is in Section 35 at an elevation of about 1150 feet on a west-facing mountainside overlooking Salmon River about 0.5 mile below its confluence with Texas Creek. It is about 0.5 mile southeast of the ruins at Ninemile (Elliott and Koch, 1981, p. 18, loc. 72). The location is accurate within about 0.2 mile.? Also see Additional Comments field, below.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary
Lead Primary

Materials information

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

Alteration

  • (Local) Granodiorite country rock adjacent to veins is impregnated with sulfides.

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Texas Creek
    Rock description Texas Creek
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -130.06481, 56.01644
ListMap

Comments on the geologic information

  • Geologic Description = The country rock in the area of the Crest prospect is the Triassic Texas Creek Granodiorite, which underlies and locally intrudes pelitic metasedimentary and subordinate andesitic (greenstone) strata of the Jurassic or older Mesozoic Hazelton Group (Smith, 1977; Koch, 1996).? the deposit (Buddington, 1929, p. 81-82) is in a thin but persistent fissure zone in granodiorite that has been traced for about 350 feet in opencuts and strippings. The zone contains quartz veins or stringers as much as 3 feet in aggregate thickness that contain shoots of relatively massive galena, accompanied by pyrite and a little chalcopyrite. The granodiorite country rock adjacent to the veins is impregnated with pyrite, which also occurs with galena on fracture surfaces. Some small quartz stringers assayed as much as 5 oz Au per ton, but most are much leaner.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Hyder

Comments on the workings information

  • Workings / Exploration = Prospect was explored in 1920's by open cuts and stripping.? Some sulfide-bearing quartz stringers assayed as high as 5 oz Au per ton, but most are much leaner.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010232
USGS Alaska Resource Data File ARDF BC072

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

    Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p.

  • Deposit

    Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360.

  • Deposit

    Koch, R.D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728-A, 35 p., 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Buddington, 1929

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins
Deposit Other Comments = Property probably originally staked in early 1920's.? the Crest(?) claims staked in 1978(?) are not on the old Crest property (Elliott and Koch, 1981, loc. 72).

Reporter information

Type Date Name Affiliation Comment
Reporter 17-MAY-1998 H. C. Berg U.S. Geological Survey