Alma Placers

The Alma Placers is a gold and sand and gravel, construction mine located in Park county, Colorado.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Alma Placers
Secondary: Alma Placer & Leaching Plant
Secondary: Alma Gold Placer

Commodity

Primary: Gold
Primary: Sand and Gravel, Construction

Location

State: Colorado
County: Park
District: Alma District

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N

Physiography

Not available

Mineral Deposit Model

Model Name: Placer Au-PGE

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Alluvium
Role: Host
Age Type: Host Rock
Age Young: Holocene

Name: Glacial Sediment
Role: Host
Age Type: Host Rock
Age Young: Pleistocene

Analytical Data

Not available

Materials

Not available

Comments

Comment (Production): Several lessors worked parts of the placer in the 1930s. (USBM IC 7101)

Comment (Reserve-Resource): In 1949, 32 holes were drilled: gravel is 70' deep for a total of 750,000 yards, averaging $0.32/yd. (assuming $35/oz Au), with 4 paystreaks. One paystreak on bedrock ran ~$1/yd. (Sunshine files, 1961)

Comment (Production): Production from 1870 to 1960 totaled about 27,000 oz. of gold 825 fine. (Sunshine files, 1961.)

Comment (Production): Timberline Enterprises operated the placer and a gold recovery plant at Alma, 1977 to 1980. (CO DIV. MINES)

Comment (Commodity): Deposit was first worked for gold, but in recent years was worked for sand and gravel.

Comment (Deposit): OPEN CUT 110' LONG, DRIFT ; INFO.SRC : 1 PUB LIT

Comment (Deposit): Workings consist of trenching.

Comment (Location): Directly east of Alma, on east side of the South Platte River, mostly in the E/2 sec 12, T 9 S, R 78 W.

References

Reference (Deposit): PARKER, 1961, GOLD PLACERS OF COLO.

Reference (Deposit): Guiteras, J. R., 1940, Mining and milling methods and costs in the Alma district, Colorado: U.S. Bureau of Mines Information Circular 7101, 63 p.

Reference (Deposit): REVISED BY MILS USING CURRENT MSHA SHEETS 3-80

Reference (Deposit): USGS CRIB A002264

Reference (Deposit): COLO DIV OF MINES, A SUMMARY OF MINERAL ACTIVITIES IN COLO

Reference (Deposit): CONSV. DIV. COMP. DATE, 9,64

Reference (Deposit): Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.

Reference (Deposit): Singewald, Q. D., 1950, Gold placers and their geologic environment in northwestern Park County, Colorado: U.S. Geological Survey Bulletin 955-D, p. 103-172.

Reference (Deposit): COLO. STATE GEOLOGICAL SURVEY BULL. 3 PL. 1

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