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Alaska Endicott Mine

Past Producer in Alaska, United States with commodities Gold, Silver, Copper
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Geologic structures
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Land status
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10001340
MRDS ID A012080
Record type Site
Current site name Alaska Endicott Mine
Alternate or previous names William Henry Bay Mine

Geographic coordinates

Geographic coordinates: -135.25734, 58.69724 (WGS84)

Site location context

Political divisions (FIPS codes)

Haines(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Juneau C-4(quadrangle 1:63,360 scale)

Juneau NW(quadrangle 1:100,000 scale)

Juneau(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lynn Canal(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • ADGGS GR 44, P. 14, FIG. 4 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
Copper Secondary

Comments on the commodity information

  • ORE PRODUCED WAS ABOUT 8% SULFIDES; REMAINING ORE CONTAINS 2% CU ORLESS

Materials information

Materials Type of material
Chalcopyrite Ore
Calcite Gangue
Chalcedony Gangue
Pyrite Gangue
Quartz Gangue

Analytical data

Result CALCITE VEINS WITH 10-20% QUARTZ, 1-3% PYRITE AND 1-2% CHALCOPYRITE CONTAINED 0.5-1.0% CU, 0.5% ZN AND 10-15 PPM AG

Host and associated rocks

  • Host or associated Associated
    Rock type Sedimentary Rock > Carbonate > Limestone
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) -135.25734, 58.69724
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Many Small Displacement Faults

Ore body information

  • Strike N75E-N80E
    Dip 70-80 S
    Thickness 3.05M

Comments on the geologic information

  • COUNTRY ROCK IN GENERAL AREA: FOLDED LIMESTONE WITH INTERBEDDED ARGILLITE, CHERT, GREENSTONE FLOWS, GREENSTONE TUFFS AND GRAYWACKE; CUT BY DIABASE DIKES

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Juneau/William Henry Bay

Land status

Ownership category National Forest

Workings at the site

  • Type of workings Surface/Underground
    Length 731.52M

Comments on the workings information

  • DEVELOPED BY 2400 FT OF ADITS, DRIFTS AND RAISES AND 3 SMALL STOPES; VEIN LOST 1350 FT FROM PORTAL, FAULTED OFF SECTION NEVER FOUND; WORKINGS OPEN (1985)

Comments on development

  • ACTIVE 1915-1923; VERY MINOR PRODUCTION PRIOR TO 1919; MILL INSTALLED 1922; SHIPMENT OF CU ORE IN 1923

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit FAULTED QUARTZ-CALCITE BRECCIA VEIN; 10 FT AVE THICKNESS; CARRYINGCHALCOPYRITE, PYRITE AND LOW AU-AG VALVES; MANY ANGULAR FRAGMENTS OF PARTLY REPLACED GREENSTONE IN VEIN
Deposit SEE ALSO: LUCKY SIX CLAIMS ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1985 Leonard, Kenneth R. (Elliott, R. L.) U.S. Geological Survey
Editor 14-APR-1994 Mosier, Dan U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.