Gilpatrick

Occurrence in Alaska, United States with commodities Gold, Silver, Copper, Zinc, Lead

Geologic information

Identification information

Deposit ID 10000334
MRDS ID A010390
Record type Site
Current site name Gilpatrick
Related records 10136938

Geographic coordinates

Geographic coordinates: -149.57037, 60.61647 (WGS84)
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • DEPOSIT NUMBER IS THE MAP LOCATION NUMBER FROM MF-880A. 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 Secondary
Copper Tertiary
Zinc Tertiary
Lead Tertiary

Materials information

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

Alteration

  • (Local) Dike Has Extensive Chlorite-Serkite Alteration

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
    Rock unit name Valdez Group
    Rock description Valdez Group;Valdez Group;

Nearby scientific data

(1) -149.57037, 60.61647

Geologic structures

Type of structure Local
Structure description Several Faults Which Cut Ore Body Strike N60e And Dip 75-90nw. Cleavage In Slate Strikes N15e And Dips 65-85e

Ore body information

  • Thickness 3.05M

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery method Ore-Mineral In Place

Mining district

District name Hope District

Land status

Ownership category National Forest

Workings at the site

  • Type of workings Surface/Underground
    Length 91.44M

Comments on the workings information

  • 3 LEVELS OF TUNNELS ARE PRESENT. THE LOWER TUNNEL IS 265 FEET LONG; THE MIDDLE TUNNEL HAS CAVED IN; THE UPPER TUNNEL IS 50 FEET LONG. ALSO OPEN TRENCHES.

Comments on development

  • LATER REFERENCES (OF 80-621, ETC.) INDICATE PRODUCTION, BUT ORIGINAL PUBLICATIONS SUGGEST THAT THIS WAS NOT THE CASE

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010390

Bibliographic references

  • Deposit

    USGS BULLETIN 587, P.164-167

  • Deposit

    USGS BULLETIN 849-I, P.512-515

  • Deposit

    USGS MISCELLANEOUS FIELD STUDIES 880-A, LOCATION 54

  • Deposit

    USGS OPEN FILE 80-621, P.86

General comments

Subject category Comment text
Deposit MINERALIZED FELSIC DIKE CONTAINS QUARTZ FILLED FRACTURES CARRIES NATIVE METALS AND SULFIDES. PARALLEL TO DIKE ARE QUARTZ VEINS 2 TO 12 INCHES IN WIDTH AT A DISTANCE OF 2 TO 10 FEET FROM THE DIKE. THE VEINS ARE MINERALIZED IN A MANNER SIMILAR TO THE DIKE. THE ORE BODIES ARE OFFSET BY SEVERAL DEXTRAL FAULTS. THE PRESENCE OF GOUGE ON ONE WALL OF THE DIKE INDICATES POST-MINERALIZATION MOVEMENT ALONG ANOTHER FAULT PARALLEL TO THE DIKE. DIKE CONTINUES FOR SEVERAL MILES (SEE FRESNO CREEK), BUT DEVELOPMENT ON THIS SITE IS RESTRICTED TO A FEW THOUSAND FEET OF ITS LENGHT.

Reporter information

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