Hartley Mine

The Hartley Mine is a lead, zinc, and silver mine located in Cascade county, Montana at an elevation of 6,201 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: Hartley Mine

Commodity

Primary: Lead
Primary: Zinc
Primary: Silver
Secondary: Copper
Secondary: Gold

Location

State: Montana
County: Cascade
District: Neihart District

Land Status

Not available

Holdings

Not available

Workings

Type: Underground

Ownership

Owner Name: Neihart Consolidated Silver Mining Co.
Home Office: Great Falls, Mt

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1901
Discovery Year: 1883
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Northern Rocky Mountains
Physiographic Detail: Little Belt Mountains

Mineral Deposit Model

Not available

Orebody

Form: SHOOTS

Structure

Type: R
Description: Zone Of Igneous Intrusions Covering Over 800 Square Km.

Type: L
Description: Moulton Fault, Northeast-Trending Fractures, Domal Uplift Caused By Intrusion Of Snow Creek Porphyry

Alterations

Alteration Type: L
Alteration Text: Sericitization, Kaolinization. Considerable Oxidation Of Ore To A Depth Of About 200 Ft.

Rocks

Name: Diorite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Proustite
Ore: Silver
Ore: Pyrargyrite
Ore: Cerargyrite
Gangue: Barite

Comments

Comment (Commodity): HIGH GRADE ORE GENERALLY COMPRISES ALL OF VEIN FILLING

Comment (Reserve-Resource): OPENING AND COMPLETION OF COMPROMISE TUNNEL MIGHT GIVE RELATIVELY INEXPENSIVE ACCESS TO MINERALIZED GROUND BETWEEN 500 AND 625 LEVEL. VEIN REPORTED TO HAVE BEEN ABOUT 4 FT. WIDE AT THE 500 LEVEL. EVEN LOW GRADE PRIMARY ORE CARRIED GOOD VALUES IN SILVER AND LEAD. RESOURCES ESTIMATED FOR BLOCK 500 FT LONG BY 200 FT DEEP BY 3 FT WIDE. DRIVING NORTHWARD ON THE NO. 3 VEIN MAY ALSO DISCLOSE ANOTHER ORE SHOOT AND A CROSSCUT TO THE NO. 2 VEIN ON THE ADIT LEVEL OR BELOW MAY OPEN AN ORE SHOOT.

Comment (Location): PROPERTY IN UNSURVEYED TERRITORY - SECTION ESTIMATED

Comment (Workings): DEPOSIT DEVELOPED BY A MAIN HAULAGE ADIT ABOUT 1000 FT. LONG, TWO ADITS ABOVE THE MAIN LEVEL, AND A 500 FT WINZE DRIVEN FROM THE MAIN ADIT WITH SEVERAL LEVELS TURNED FROM THE WINZE. THE COMPROMISE TUNNEL WAS DRIVEN ABOUT 1900 FT. NORTHEAST FROM THE COMPROMISE CLAIM (IN COMPROMISE GULCH) AND LACKED ABOUT 800 FT. OF INTERSECTING THE HARTLEY WORKINGS ABOUT 650 FT BELOW THE MAIN ADIT.

Comment (Geology): VEIN MATERIAL COMMONLY BANDED. HIGH GRADE ORE USUALLY COMPRISES ALL OF VEIN FILLING. CRYSTALLINE PRECAMBRIAN ROCKS ARE PRE-BELT

References

Reference (Deposit): SCHAFER P. A., 1935, GEOLOGY AND ORE DEPOSITS OF THE NEIHART MINING DISTRICT, CASCADE COUNTY, MONTANA: MONT. BUREAU OF MINES GEOL. MEM 13, 62 P.

Reference (Deposit): KLEINKOPF, M. D., AND OTHERS, 1972, AEROMAGNETIC, BOUGUER GRAVITY, AND GENERALIZED GEOLOGIC MAPS OF THE CENTRAL PART OF THE LITTLE BELT MOUNTAINS: U.S. GEOLOGICAL SURVEY MAP GP-837.

Reference (Deposit): ROBERTSON, A. F., 1951, MINES AND MINERAL DEPOSITS (EXCEPT FUELS), CASCADE COUNTY, MONT.: U.S. BUREAU OF MINES INF. CIRC. 7589, 76 P.

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.