Hirst-Chichagof Mine

Past Producer in Alaska, United States with commodities Gold, Silver, Lead, Zinc, Copper, Arsenic

Geologic information

Identification information

Deposit ID 10100942
MRDS ID A010687
Record type Site
Current site name Hirst-Chichagof Mine
Alternate or previous names Hirst, Bahrt

Geographic coordinates

Geographic coordinates: -136.11036, 57.68582 (WGS84)
(click for info)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • 1 1/2 MILES FROM CHICHAGOFF MINE LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Gold Primary
Silver Primary
Lead Secondary
Zinc Tertiary
Copper Tertiary
Arsenic Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Sphalerite Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Porphyry Dike Alogn Footwall Is Altered

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
    Rock unit name Sitka Graywacke;Sitka Graywacke
    Rock description Sitka Graywacke;Sitka Graywacke

Nearby scientific data

(1) -136.11036, 57.68582

Geologic structures

Type of structure Local
Structure description Hirst Fault Localizes Ore Shoots

Ore body information

  • General form TABULAR

Controls for ore emplacement

  • Intersections Of Main Fault & Bedding And Also Warp In Main Fault

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1905
Year of first production 1922
Year of last production 1943

Production statistics

  • Year 1938
    Period 1922-1938
    Material AU
    Accuracy Estimate
    Description Cp_Grade: ^1.3 Oz Au/Ton (Average 1938)
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 37g/mt

Workings at the site

  • Type of workings Underground
    Overall depth 548.64M

Comments on the workings information

  • SEVERAL THOUSAND FT OF WORKINGS ON AT LEAST 12 LEVELS.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010687

Bibliographic references

  • Deposit

    USGS OFR 78-450, P. 58-61

  • Deposit

    USGS B 929, P. 78-81, 101-118

  • Production

    USGS B929

General comments

Subject category Comment text
Deposit SIMILAR TO CHICHAGOFF. ORE RUNS LESS THAN 1% SULFIDES. DEPOSITS ARE QUARTZ BODIES UP TO 10 FT THICK IN HIRST FAULT & IN SPLITS FROM IT. SHOOTS LOCALIZED ALONG INTERSECTIONS OF FAULTS & BEDDING PLANES AND IN WARP IN MAIN FAULT.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1984 Elliott, R. L. U.S. Geological Survey
Editor 13-APR-1994 Mosier, Dan U.S. Geological Survey