Combined Metals Reduction Co No. 1 Shaft

The Combined Metals Reduction Co No. 1 Shaft is a silver, lead, and zinc mine located in Lincoln county, Nevada at an elevation of 6,345 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

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Site Name

Primary: Combined Metals Reduction Co No. 1 Shaft
Secondary: Raymond and Ely No 1
Secondary: Yz Mine
Secondary: Pioche Consolidated Mining Co 1880's
Secondary: Panaca Mine
Secondary: Lightner Shaft ?
Secondary: No 1 Mine
Secondary: NBMG Sample Site 1428.

Commodity

Primary: Silver
Primary: Lead
Primary: Zinc
Secondary: Gold
Secondary: Copper
Tertiary: Manganese
Tertiary: Tungsten
Tertiary: Arsenic
Tertiary: Antimony

Location

State: Nevada
County: Lincoln
District: Pioche District District

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

Owner Name: Amalgamated Pioche Mines And Smelter Corp.
Years: 1932 -

Owner Name: Combined Metals Reduction Co. (Royalty Basis)
Years: 1932 -

Production

Year: 1926
Time Period: 1924-1926
Material type: ORE
Description: Cp_Grade: ^10-20% Zn 6-8.5 Oz Ag/Ton 6.8% Pb .04 Oz Au/Ton

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic replacement

Orebody

Form: TABULAR

Structure

Type: L
Description: Area Completely Faulted

Alterations

Not available

Rocks

Name: Shale
Role: Associated
Age Type: Associated Rock
Age Young: Late Cambrian

Name: Shale
Role: Associated
Age Type: Host Rock
Age Young: Late Cambrian

Analytical Data

Analytical Data: SAMPLE 1428 CONTAINS 10 % FE, GREATER THAN 5000 PPM MN, 100 PPM AG, 1500 PPM AS, 150 PPM BA, 300 PPM CD, 300 PPM CU, 10000 PPM PB, 200 PPM SB, 50 PPM W, GREATER THAN 10000 PPM ZN.

Materials

Ore: Pyrargyrite
Ore: Chalcopyrite
Ore: Sphalerite
Ore: Proustite
Ore: Galena
Gangue: Pyrite

Comments

Comment (Production): TOTAL PRODUCTION FROM 1917 TO 1960 INCLUDES CASELTON MINE AND NO. 1 EXACT TOTAL PRODUCTION UNKNOWN.

Comment (Deposit): THE COMPLEX SULFIDE ORE WAS OF NO VALUE UNTIL SELECTIVE FLOTATION WAS INVENTED. THE MAIN OREBODY IS THE RESULT OF SELECTED REPLACEMENT OF THE COMBINED METALS LIMESTONE ONLY WHERE THE LIMESTONE IS INTERSECTED BY A STEEPLY-DIPPING FISSURE (THE GREENDWOOD FISSURE). ORE HAS BEEN OFFSET BY MANY CROSS-FAULTS. THE GREENWOOD FISSURE IS A FAULT OF SLIGHT DISPLACEMENT, USUALLY EXPRESSED AS A THIN GOUGE SEAM BUT MAY BE UP TO 5 FT THICK. IT TRENDS N70E, DIPS 65-70N, NEARLY PARALLELLING THE RAYMOND AND ELY VEIN, WHICH DIPS 75S. THE MAIN OREBODY IN THE NO. 1 MINE IS A TABULAR MASS OF SULFIDES EXTENDING LATERALLY INTO THE LIMESTONE LAYER, THICKEST (30-40 FT) ADJACENT TO THE GREENWOOD FISSURE, AND TAPERING DOWN AWAY FROM IT. ORE OF THE UPPER BED PRESERVES THE NODULAR CHARACTER OF THE LIMESTONE HOST. ORE IS MASSIVE SULFIDE CONSISTING OF ABOUT 60% PYRITE, 22% SPHALERITE, 8% GALENA, MINOR CHALCOPYRITE AND PRACTICALLY NO GANGUE MINERALS. LOWER BED ORE IS MASSIVE WITH AN IRREGULAR BOTTOM CONTACT, AS THE

Comment (Deposit): UNDERLYING QUARTZITE HAS BEEN IRREGULARLY REPLACED BY PYRITE AND SPHALERITE. ORE IS UNOXIDIZED. THE RAYMOND AND ELY VEIN SYSTEM CONTAINING HIGH-GRADE PB-AG ORE MINED IN THE 1870'S, SPLITS EASTWARD INTO TWO BRANCHES: THE MEADOW VALLEY VEIN AND THE BURKE VEIN. THE LARGEST AND RICHEST ORE SHOOT OCCURRED IN THE RAYMOND AND ELY VEIN JUST BELOW THE PIOCHE SHALE WITHIN ABOUT 400 FT OF THE YUBA DIKE.

Comment (Commodity): THE ORE MINED WAS OF VERY CONSTANT COMPOSITION.

Comment (Development): MOST PRODUCTIVE MINE IN PIOCHE DISTRICT. CMRC BUILT MILL AT BAUER UTAH IN 1923 TO MILL THE ORE UNTIL THE CASELTON MILL WAS BUILT IN 1941. IN 1958 AND 1959, THE YZ MINE, OPERATING THROUGH THE NO 1 SHAFT, WAS THE MAIN PRODUCING MINE IN THE DISTRICT, PRODUCING ORE FROM SILVER VEINS IN THE QUARTZITE.

Comment (Geology): BEDDED ORE 200 FT. ON EITHER SIDE OF THE GREENWOOD FISSURE; RAYMOND AND ELY VEIN IN THE PROSPECT MOUNTAIN QUARTZITE STRIKE PARALLEL TO THE GREENWOOD FISSURE; GREENWOOD ORE CHIEFLY IN PIOCHE SHALE. THE BLACK LEDGE VEIN, OF QUARTZ AND SPHALERITE, ALSO MINED, WITH 12-20% ZN AND 5-21 OZ AG/TN. ARENACEOUS SHALE WITH ABUNDANT MUSCOVITE. COMBINED METALS MEMBER OF THE PIOCHE SHALE IS THE HOST ROCK FOR THE REPLACEMENT OREBODIES. IT CONSISTS OF 3 PARTS: (1) A LOWER 3 FT OF MASSIVE LIMESTONE (2) A MIDDLE 3-FT THICK CALCAREOUS SANDSTONE (WHICH IN THE OREBODY IS UNREPLACED) AND (3) AN UPPER 30-FT LAYER OF THIN-BEDDED NODULAR LIMESTONES, USUALLY ONLY 2-3 INCHES THICK AND SO NODULAR THAT THEY LOOK LIKE "BEDS OF FLATTENED POTATOES". THE NODULES ARE COATED WITH A THIN BLACK CARBONACEOUS SKIN. THE PIOCHE SHALE BELT TRENDS NW BETWEEN 2 FAULTS.

References

Reference (Deposit): TSCHANZ, C.M., AND PAMPEYAN, E.H., 1970, GEOLOGY AND MINERAL DEPOSITS OF LINCOLN CO. NEVADA. NEVADA BUR. OF MINES, BULL 73 P.

Reference (Deposit): WESTGATE, L.G. AND KNOPF, A., 1932, GEOLOGY AND ORE DEPOSITS OF THE PIOCHE DISTRICT, NEVADA. USGS PROF. PAPER 171 P.

Reference (Deposit): HILL, J.M., 1916, NOTES ON SOME MINING DISTRICTS IN EASTERN NEVADA USGS BULL 648 P.

Reference (Deposit): COUCH, B.F., CARPENTER, J.A., 1943, NEVADAS METAL AND MINERAL PRODUCTION (1859-1940, INCLUSIVE). UNIV. OF NEVADA BULL 38, P. 85-89

Reference (Deposit): ANDERSON, J. C., 1922, ENG. AND MIN. JOUR., VOL. 113.

Reference (Deposit): DEAN, R. L., APR 1943, MIN CONGR JOUR, P. 18-22; MAY, 1943, P. 54-55

Reference (Deposit): SMITH, P- AND BENTZ, J., 1983, FIELD EXAMINATION REPORT, AUG. 24, 1983

Reference (Deposit): ABBOTT, J. W., 1907, MIN AND SCI PRESS.

Reference (Production): TSCHANZ AND PAMPEYAN, 1970

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.