Johnson Mine & Group

The Johnson Mine & Group is a copper and silver mine located in Elko county, Nevada at an elevation of 6,601 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: Johnson Mine & Group

Commodity

Primary: Copper
Primary: Silver
Secondary: Gold
Secondary: Molybdenum

Location

State: Nevada
County: Elko
District: Contact (48)

Land Status

Not available

Holdings

Not available

Workings

Type: Underground

Ownership

Owner Name: Montilla Mining Co.
Years: 1912 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1912
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Columbia Plateau
Physiographic Section: Snake River Plain

Mineral Deposit Model

Model Name: Skarn Cu

Orebody

Form: IRREGULAR

Structure

Type: L
Description: Granodiorite Stock With Assoc. Faults, Fractures

Alterations

Alteration Type: L
Alteration Text: Oxidation

Rocks

Name: Diorite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Permian

Name: Diorite
Role: Associated
Age Type: Associated Rock
Age Young: Late Jurassic

Name: Diorite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Late Jurassic

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Bornite

Comments

Comment (Location): COVERS MOST OF JOHNSON HILL

Comment (Production): SMALL PRODUCTION INCLUDED SOME MOLYBDENUM

Comment (Development): 9 OR MORE CLAIMS

Comment (Deposit): THIS GROUP COMPRISES 9 OR MORE CLAIMS AND COVERS MOST OF JOHNSON HILL. THE PRINCIPAL OPENINGS ARE A 400-FOOT TUNNEL AND A 100-FOOT SHAFT. THE TUNNEL SHOWS 6 INCHES TO 18 INCHES OF BANDED AND CRUSHED PARTLY MINERALIZED VEIN MATERIAL FOR MUCH OF ITS LENGTH; HOWEVER, COPPER CARBONATE STAINING IS VERY SPORADIC AND THERE IS NO TRACE OF ORE. THE SHAFT IS ALSO LOCATED ON THE GRANODIORITE-LIMESTONE CONTACT AND AT 100 FEET IS STILL IN THE OXIDIZED ZONE (SCHRADER, 1912, 141-2). ; INFO.SRC : 1 PUB LIT

Comment (Geology): GRANODIORITE IS UNUSUALLY DARK WITH FAR MORE THAN THE ORDINARY AMOUNT OF GREEN HORNBLENDE, AND IS CRUSHED, SHEARED, PRESSED, AND SHISTOSE. BOTH GRANODIORITE AND LIMESTONE ARE CUT BY DIKES OF COARSE QUARTZ SYENITE PORPHYRY YOUNGER THAN THE SHEARING (SCHRADER, 1912, P 142).

Comment (Deposit): TUNNEL SHOWS 6 TO 18 INCHES OF BANDED & CRUSHED PARTLY MINERALIZED VEIN MATERIAL FOR MUCH OF ITS LENGTH. SHAFT IS ON THE GRANODIORITE-LIMESTONE CONTACT. ORE IS OXIDIZED TO 100 FEET DOWN, AT LEAST

Comment (Workings): 400-FT. TUNNEL; 100 FT. SHAFT ON THE GRANODIORITE - LIMESTONE CONTACT.

References

Reference (Deposit): SMITH, R.M. (1976) MINERAL RESOURCES OF ELKO CO., NEV: USGS OFR 76-56, P 39-45

Reference (Deposit): SCHRADER, F.C. (1936) THE CONTACT MINING DISTRICT, NEVADA: USGS BUL. 847-A

Reference (Deposit): HOPE, R.A.& COATS, R.R. (1976) PRELIM. GEOLOGIC MAP OF ELKO CO., NEV: USGS OFR 76-779.

Reference (Deposit): SCHRADER, F.C. (1912) A RECONN. OF THE JARBRIDGE, CONTACT, AND ELK MT. MINING DISTRICTS, ELKO COUNTY, NEVADA: USGS BUL 497.

Reference (Production): SMITH, R.M. (1976)

Nevada Gold

Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.