Seventymile River Placer

Past Producer in Alaska, United States with commodity Gold

Geologic information

Identification information

Deposit ID 10002687
MRDS ID A015128
Record type Site
Current site name Seventymile River Placer
Related records 10258057

Geographic coordinates

Geographic coordinates: -141.83054, 64.93034 (WGS84)
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • USGS MF-393, LOC. 19,23-25,28. COORDINATES GIVEN ARE FOR SEVENTYMILE RIVER FALLS, A SERIES OF RAPIDS. 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

Materials information

Materials Type of material
Gold Ore

Analytical data

Result FINENESS 828 PARTS AU AND 163 PARTS AG. SEE REF. 3, P. 254-255.

Nearby scientific data

(1) -141.83054, 64.93034

Geologic structures

Type of structure Regional
Structure description Tintina Fault

Comments on the geologic information

  • 9 FT. HIGH FALLS WHERE RIVER FLOWS THROUGH SCHIST TO REACH CUT IN TERTIARY CONGLOMERATE. SEVENTYMILE RIVER FOLLOWS TRACE OF TINTINA FAULT IN EAGLE (D-2) ; MAJOR.UNITS: RIVER HEADS IN GRANITIC TERRANE; FLOWS THROUGH METAMORPHOSED ROCKS TO FALLS; FLOWS THROUGH TERTIARY SEDIMENTARY ROCKS FOR MOST OF COURSE BELOW FALLS; CARBONIFEROUS ROCKS AT MOUTH. ; REG.COM: GOLD PROBABLY DERIVED FROM QUARTZ VEINS AND OTHER MINERALIZED AREAS RELATED TO CHARLIE RIVER BATHOLITH.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1902
Year of last production 1939

Mining district

District name Eagle

Comments on development

  • CONSIDERABLE MINING IN EARLY YEARS IN SEVENTYMILE RIVER VALLEY; IN 1936 NEARLY ALL MINING ON TRIBUTARIES.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015128

Bibliographic references

  • Deposit

    USGS MF-393 (D-2, 3), LOC. 19, 23-25, 28.

  • Deposit

    USGS BULL. 897-C, P. 191-195

  • Deposit

    USGS BULL. 917-D, P. 254-255

General comments

Subject category Comment text
Deposit GOLD MINED ON RIVER BARS AND ON LOW BENCHES IMMEDIATELY ABOVE FALLS AND FOR SOME DISTANCE UPSTREAM. GOLD FROM NEAR MOUTH OF BROKEN NECK CR. CONTAINED ALLOYED PLATINUM.
Deposit RIVER GRADIENT ABOUT 50 FT. PER MILE. LOCATION DESCRIPTION FOR ENTIRE LENGTH OF SEVENTYMILE RIVER IN EAGLE (D-2) AND ALONG S.R. NEAR MOUTH OF DEEP CR. IN EAGLE (D-3). ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
Deposit THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1987 Powers, M.T. (Huber, D.F.) U.S. Geological Survey