August Mine

The August Mine is a gold mine located in Phillips county, Montana at an elevation of 4,902 feet.

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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: August Mine

Commodity

Primary: Gold
Secondary: Silver
Tertiary: Fluorine-Fluorite

Location

State: Montana
County: Phillips
District: Little Rockies

Land Status

Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Underground

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1893
Discovery Year: 1893
Discovery Method: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Interior Plains
Physiographic Province: Great Plains Province
Physiographic Section: Missouri Plateau, Unglaciated
Physiographic Detail: Little Rocky Mountains

Mineral Deposit Model

Not available

Orebody

Form: TABULAR

Structure

Type: L
Description: Upwarping Of Sediments By Intrusion Of Porphyry

Alterations

Alteration Type: L
Alteration Text: Porphyry Altered Through Silicification

Rocks

Name: Syenite
Role: Associated
Age Type: Host Rock
Age Young: Late Permian

Name: Syenite
Role: Associated
Age Type: Associated Rock
Age Young: Late Cretaceous

Name: Syenite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Limonite
Ore: Fluorite

Comments

Comment (Location): ALTITUDE IS APPROXIMATE

Comment (Workings): LENGTH AND DEPTH OF WORKINGS ARE APPROXIMATE DUE TO SPARSE INFORMATION

Comment (Geology): THE PORPHYRY IS SAID TO RANGE FROM SYENITE TO TINGUAITE IN COMPOSITION.

Comment (Deposit): ACCORDING TO THE MINERAL RESOURCES SOURCE CITED IN THE PRODUCTION REFERENCE SECTION, BY THE CLOSE OF 1909 $340,000 IN ORE AND BULLION HAD BEEN SHIPPED FROM THE AUGUST MINE. CORRY CITES 90,000 TONS OF GOLD ORE HAD BEEN EXTRACTED AT A NET WORTH OF $1,500,000. VARIOUS TONNAGES WERE SHIPPED AS LATE AS 1931 WITH VALUES VARYING FROM $8,000 TO $14,000, PER CARLOAD SHIPPED.

References

Reference (Deposit): WEED, W. H., 1896, ORE DEPOSITS OF THE LITTLE ROCKY MOUNTAINS, MONTANA, THE ENGINEERING AND MINING JOURNAL, VOL. 61, P. 423-424.

Reference (Deposit): DYSON, J. L., 1939, RUBY GULCH GOLD MINING DISTRICT, LITTLE ROCKY MOUNTAINS, MONTANA ECONOMIC GEOLOGY VOL. 34. NO. 2 P 201-213

Reference (Production): CORRY, A. V., 1933, GOLD DEPOSITS SOME COUNTIES, MT

Reference (Deposit): CORRY, A. V., 1933, SOME GOLD DEPOSITS OF BROADWATER, BEAVERHEAD, PHILLIPS AND FERGUS COUNTIES, MONTANA: MONT. BUREAU OF MINES GEOL. MEM. 10 P. 30-36

Reference (Deposit): KOSCHMANN, A. H., AND BERGENDAHL, M. H., 1968, PRINCIPAL GOLD-PRODUCING DISTRICTS OF THE UNITED STATES: U. S. GEOL. SURV. PROF. PAPER 610, P. 167

Principal Gold Districts of Montana

In Montana, 54 mining districts have each have produced more than 10,000 ounces of gold. The largest producers are Butte, Helena, Marysville, and Virginia City, each having produced more than one million ounces. Twenty seven other districts are each credited with between 100,000 and one million ounces of gold production. Read more: Principal Gold Districts of Montana.