Elkhorn Mine

  

Mine Info

State: Montana

County: Jefferson

Elevation: 6,601 feet (2,012 meters)

Primary Mineral: Silver, Lead, Zinc

Lat, Long: 46.2725, -111.94167

Gallery: View 8 Elkhorn Mine Photos



Mine Description

The ore deposit known as the "Elkhorn" mine was located as the Holter lode on January 2, 1875, and was worked nearly continuously from that time until November, 1899. The general history of the property has already been mentioned in giving that of the Elkhorn Mining district district. The New Elkhorn Mining Company stopped work in the mine in the autumn of 1899, and as the pumps were withdrawn, the surface machinery dismantled and sold, and the mine practically abandoned, it was generally understood that this great producer was worked out and the last chapter of its history completed. The entire property, including such surface improvements as were of value, was sold to two successful mining operators for $20,000 early in 1900, and it was generally supposed at that time that only the dump heaps would be worked. The new owners decided, however, to reopen the upper levels of the mine, and the property is now (May, 1901) being equipped with the necessary machinery for working, and promises to again become a producing property. The abandonment of the mine by the English corporation was primarily due to the exhaustion of the rich ore bodies, for although more or less ore remained, it was of too low grade to pay expenses, owing to the heavy expenditures necessary in pumping the mine, which were over $1,000 a week; this, and the small number of men scattered over so large a mine working the lowgrade patches and remnants of ore bodies left in previous years, made the cost per ton excessive. Thus the actual cost of mining exceeded $15 per ton, including all expenses. Milling cost $9, owing to baseness of the ore, and for a long time the reduction works were run on a profit of only 50 cents per ton, thus necessitating very close working.

Elkhorn Mine MRDS details

Site Name

Commodity

Location

Primary: "Elkhorn Mine"
Secondary: "Holter"
Primary: Silver
Primary: Lead
Primary: Zinc
Secondary: Copper
Secondary: Gold
Tertiary: Bismuth
State: Montana
County: Jefferson
District: Elkhorn Mining District
 

Land Status

Holdings

Workings

Land ownership:
Administrative Organization:
Type:


Ownership

Production

Deposit

Owner Name: Walker, Laura
Company ID:
Percent:
Home Office:
Info Year:
Years: -

Owner Name: Development Operating Co.
Company ID:
Percent:
Home Office:
Info Year:
Years: -

Owner Name: Youlden, Charles And Martha
Company ID:
Percent:
Home Office:
Info Year:
Years: -

Owner Name: Henningsen, Anker
Company ID:
Percent:
Home Office:
Info Year:
Years: -

Year: 1957
Time Period: 1875-1957
Mined: 464988.870 mt
Material type: Cu
Description:
Year: 1957
Time Period: 1875-1957
Mined: 2170867.450 g
Material type: Au
Description:
Year: 1957
Time Period: 1875-1957
Mined: 1453504.540 mt
Material type: Zn
Description:
Year: 1957
Time Period: 1875-1957
Mined: 7419570.510 mt
Material type: Pb
Description:
Year: 1957
Time Period: 1875-1957
Mined: 468249065.40 g
Material type: Ag
Description:
Year: 1957
Time Period: 1875-1957
Mined: 800779.330 mt
Material type: ore
Description:
Record Type: Site
Operation Category: Past Producer
Deposit Type: Polymetalic Replacement
Plant Type:
Plant Subtype:
Operation Type: Unknown
Mining Method:
Milling Method:
Year First Production: 1875
Year Last Production:
Discovery Year: 1875
Discovery Method: Unknown
Years of Production:
Organization:
Significant: Y
Deposit Size: M


Physiography

Mineral Deposit Model

Orebody

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Section:
Physiographic Detail: Elkhorn Mountains
Name:
Form: IRREGULARLY TABULAR AND ALSO PIPE-LIKE


Structure

Alterations

Rocks

Type: R
Structure: INTRUDED BY QUARTZ MONZONITE AND APLITE
Description:
Type: R
Structure: MESOZOIC SANDSTONE, SHALE AND IMPURE LIMESTONE
Description:
Type: R
Structure: FOLDED AND FAULTED BELT SERIES SHALE, PALEOZOIC LIMESTONE, SHALE AND QUARTZ
Description:
Type: R
Structure: LATE CRET ANDESITIC BRECCIAS, TUFFS, AND LAVAS
Description:
Type: L
Structure:
Description: Ore Is Localized In Anticlinal Arches Along Pilgrim Dolomite-Red Lion Contact
Alteration Type: L
Alteration:
Alteration Text: Some Bleaching Of Slate Near Ore Bodies
Name: Dolomite
Role: Host
Description:
Age Type: Host Rock
Age in Years:
Dating Method:
Material Analyzed:
Age Young: Late Cambrian
Age Old:


Analytical Data

Materials

Analytical Data : AVERAGE OF 7,000 TONS BETWEEN 1945 AND 1951 IS 0.0178 OZ AU/TON, 11.1 OZ AG/TON, 12.15% PB, 2.55% ZN, AND 0.14% CU
Ore: Silver
Ore: Sphalerite
Ore: Tetradymite
Ore: Galena
Ore: Bournonite
Ore: Tetrahedrite
Gangue: Quartz


Comments

Comment Type:
Development
Comment THE ORE AGAINST THE SLATE CONTACT IS QUARTZOSE BUT WITHIN THE DOLMITE IS A SILVER-LEAD SMELTING ORE.
Comment Type:
Workings
Comment MINE DEVELOPED FROM A MAIN SHAFT INCLINED 30 DEG-50 DEG FROM WHICH 23 LEVELS WERE DRIVEN AT SLOPE INTERVALS OF ABOUT 100 FT. AND VERTICAL SOPHIA SHAFT FROM WHICH LEVELS WERE RUN AT DEPTHS OF 65 AND 110 FT.
Comment Type:
Deposit
Comment Merged data from Deposit ID's 10008099 (Elkhorn Mine), 10069273 (Elkhorn Jefferson Co.), 10048811 (Elkhorn), 10269978 (Elkhorn), 10245604 (Elkhorn Mine), and 10008981 (Elkhorn)
Comment Type:
Reserve-Resource
Comment IF ADDITIONAL ORE SHOOTS CAN BE FOUND UNDER OTHER ANTICLINAL FLEXURES ALONG SLATE-DOLOMITE CONTACT, POTENTIAL RESOURCES COULD EQUAL PAST PRODUCTION


References

Reference Category:
Deposit
Pages:
Reference: FOSTER, FESS, AND CHILDS, J.F., 1993, AN OVERVIEW OF SIGNIFICANT LODE GOLD SYSTEMS IN MONTANA, AND THEIR REGIONAL GEOLOGIC SETTING: EXPLORATION AND MINING GEOLOGY, V. 2, P. 217-244.
URL:
Reference Category:
Deposit
Pages:
Reference: KOSCHMANN, A.H., AND BERGENDAHL, M.H., 1968, PRINCIPAL GOLD-PRODUCING DISTRICTS OF THE UNITED STATES: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 610, P. 153.
URL:
Reference Category:
Production
Pages:
Reference: WEED, W.H., 1901, P. 415; KLEPPER ETAL, 1957, P. 67 AND OME FILES.
URL:
Reference Category:
Reserve-Resource
Pages:
Reference: OME FILES
URL:
Reference Category:
Deposit
Pages:
Reference: KLEPPER, M.R., WEEKS, R.A., RUPPEL, E.T., 1957, GEOLOGY OF THE SOUTHERN ELKHORN MOUNTAINS, JEFFERSON AND BROADWATER COUNTIES, MONTANA: USGS PROF. PAPER, P. 67-68
URL:
Reference Category:
Deposit
Pages:
Reference: WEED, W.H., 1901, GEOLOGY AND ORE DEPOSITS OF THE ELKHORN MINING DISTRICT, JEFFERSON COUNTY, MONTANA: USGS 22ND ANN. RPT. PT. 2 P. 399-550
URL:
Reference Category:
Deposit
Pages:
Reference: 1896 GEOLMAP WEED, W.H., 22ND ANN. RPT.
URL:
Reference Category:
Deposit
Pages:
Reference: 1949 GEOLMAP KLEPPER, WEEKS, AND RUPPEL, PROF. PAPER 292
URL:

Did You Know.......

A mine is a hole in the ground, owned by a liar.
-Mark Twain

About The MRDS Mines Database

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.

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