Midnight Creek Placer

Past Producer in Alaska, United States with commodities Gold, Tin, Silver, Tungsten

Geologic information

Identification information

Deposit ID 10101029
MRDS ID A015544
Record type Site
Current site name Midnight Creek Placer
Related records 10281672

Geographic coordinates

Geographic coordinates: -155.53364, 64.31893 (WGS84)
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • USGS MF-405, LOC. 22. STRIP MINE MARKED ON RUBY (B-6). COORDINATES GIVEN FOR APPROXIMATE CENTER OF TAILINGS. TRIBUTARY OF LONG CREEK. 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
Tin Primary
Silver Secondary
Tungsten Tertiary

Materials information

Materials Type of material
Gold Ore
Scheelite Ore
Cassiterite Unknown

Analytical data

Result GRADE 1.3 GLM3 AU. FINENESS 883-885.5 AU, BUT ONE SHIPMENT ASSAYED ONLY 857.5 FINE.

Nearby scientific data

(1) -155.53364, 64.31893

Comments on the geologic information

  • CREEK DRAINS GRANITE CONTACT AREA. CREEK FLOWS IN A SHALLOW VALLEY THAT IS APPROXIMATELY 5,000 FT. WIDE BETWEEN DIVIDES. ; MAJOR.UNITS: BEDROCK SCHIST WITH QUARTZ VEINS NEAR HEAD OF VALLEY GRANITE ON RIDGES AT HEAD; SCHIST, SLATE, SILICEOUS CHERTY ROCK, AND SOME GREENSTONE IN VALLEY BOTTOM IN MIDDLE AND LOWER VALLEY; GREENSTONE BEDROCK ON RIDGES ON EITHER SIDE. ; REG.COM: BEDROCK LODE SOURCE THOUGHT TO BE LOCAL QUARTZ VEINS IN SCHIST OR LODES IN AND AROUND GRANITE IN HEADWATER AREA.

Economic information

Economic information about the deposit and operations

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

Mining district

District name Ruby

Land status

Ownership category State

Comments on the workings information

  • ONLY THE DEEPER PARTS OF ALLUVIUM PERENIALLY FROZEN.

Comments on development

  • MINING (NOT CONTINUOUS) FROM 1911 TO 1949. DRIFT MINING REPORTED IN 1916; MINED ALSO BY OPEN CUTS.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015544

Bibliographic references

  • Deposit

    USGS MF-405 (B-6), LOC. 22

  • Deposit

    USGS OF 239, P. 37, 40-42.

  • Deposit

    USGS OF 77-168 D, P. 87, LOC. 34.

  • Deposit

    USGS BULL. 642, P. 242-243.

General comments

Subject category Comment text
Deposit STREAM GRADIENT APPROXIMATELY 125 FEET PER MILE; GIVES ADEQUATE DRAINAGE. ; 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.
Deposit GOLD ACCOMPANIED BY MUCH CASSITERITE AND RARE SCHEELITE. GOLD ON BEDROCK OR CLAY FALSE BEDROCK. PAY STREAK 100-150 FT. WIDE ALONG SOUTH SIDE OF VALLEY ADJACENT TO CREEK. THICKNESS OF MUCK AND GRAVEL INCREASES FROM 9 FT. IN UPPER VALLEY TO 80 FT. 1.7 MILES ABOVE MOUTH; POSTULATED TO BE 125 FT. AT MOUTH. DISTRIBUTION OF GOLD AND CASSITERITE SPOTTY.

Reporter information

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