Monument Creek Placer

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

Geologic information

Identification information

Deposit ID 10003029
MRDS ID A015547
Record type Site
Current site name Monument Creek Placer
Related records 10136468

Geographic coordinates

Geographic coordinates: -155.42529, 64.27171 (WGS84)
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • USGS MF-405, LOC. 24. PLACER GROUND FROM A POINT HALF A MILE ABOVE RABBIT CREEK DOWNSTREAM FOR ABOUT A MILE. COORDINATES GIVEN FOR DISCOVERY CLAIM AT MOUTH OF RABBIT 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
Silver Secondary
Tin Tertiary

Materials information

Materials Type of material
Cassiterite Ore
Gold Ore

Analytical data

Result AVERAGE FINENESS OF 3 ASSAYS WAS 853 PARTS AU AND 139 PARTS AG.

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Chert
  • Host or associated Associated
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -155.42529, 64.27171

Comments on the geologic information

  • MAJOR.UNITS: BEDROCK GABBROIC GREENSTONE AND SILICEOUS SCHIST; GRANITE ON HEADWATER DIVIDE TO NORTH. ; REG.COM: LODE SOURCE OF GOLD PROBABLY IN SCHISTOSE ROCKS AND PERIPHERAL TO GRANITE. GRANITE ON HEADWATER DIVIDE TO NORTH IS PROBABLY THE SOURCE AREA FOR METALS IN PLACER DEPOSITS.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1912
Year of first production 1913
Year of last production 1933

Mining district

District name Ruby

Land status

Ownership category State

Comments on development

  • GOOD PLACER GROUND DISCOVERED ABOUT MIDWAY IN STREAM'S COURSE, WINTER 1912-13. MINING, SUMMER 1913. SPORADIC MINING 1913 TO 1933; UNDERGROUND DRIFT METHODS REPORTED.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015547

Bibliographic references

  • Deposit

    USGS MF-405 (B-5), LOC. 24.

  • Deposit

    USGS BULL 864-C, P. 153-154.

  • Deposit

    USGS OF 77-168 D, P. 87, LOC. 35.

  • Deposit

    USGS OF 81-170, P. 53-54.

General comments

Subject category Comment text
Deposit GOLD OCCURS IN STREAKS OF FINE GRAVEL 3 TO 6 INCHES THICK IN MAIN BODY OF GRAVEL. THESE STREAKS ARE IRREGULARLY DISTRIBUTED BOTH VERTICALLY AND HORIZONTALLY. LITTLE OR NO GOLD IS FOUND ON BEDROCK. PAY STREAK ABOUT A MILE LONG, 20-50 FEET WIDE, AND ABOUT 15 FT. THICK (ALL OF GRAVEL); GRAVEL OVERLAIN BY ABOUT 25 FEET OF FROZEN MUCK. THE PAY STREAK LIES ABOUT 100 FEET NW OF AND PARALLEL TO THE CREEK. ONLY A LITTLE CASSITERITE IN GRAVELS.
Deposit STREAM GRADIENT APPROXIMATELY 50 FEET PER MILE IN AREA MINED. ; 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 Discovery Year: 1912-13

Reporter information

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