Gold Bar Mine

Site Name

Primary: Gold Bar Mine

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Commodity

Primary: Gold
Primary: Silver
Tertiary: Antimony
Tertiary: Arsenic
Tertiary: Mercury
Tertiary: Barium-Barite
Tertiary: Manganese

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Location

State: Nevada
County: Eureka
District: Antelope District

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Land Status

Land ownership: BLM Administrative Area
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.

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: Atlas Precious Metals, Inc.

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1986
Year Last Production: 1990
Discovery Year: 1983
Years of Production:
Organization:
Significant: N
Deposit Size: M

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Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Great Basin
Physiographic Detail: Basin And Mountains

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Mineral Deposit Model

Model Name: Carbonate-hosted Au-Ag

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Orebody

Not available

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Structure

Type: R
Description: Roberts Mountain Thrust

Type: L
Description: Paleozoic Thrusting And Folding And Tertiary High Angle Faulting. Limestone Beds Are Gently Folded Along Ene-Trending Fold Axes, Forming Anticlines And Synclines That Plunge 10-40 Degrees To The East. The Dominant Tertiary Fault Sets Strike Northwest And North-South; Other Sets Strike East-Northeast And Northeast.

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Alterations

Alteration Type: L
Alteration Text: Major Decalcification, Silicification, Carbon Remobilization, And Iron Oxidation And Redistribution. Minor Bleaching, Calcite Veining, Argillization. See Geology Comments.

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Rocks

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age in Years: 23.800000+-
Dating Method: K-Ar
Age Young: Miocene

Name: Rhyolite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Devonian

Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Late Devonian

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Analytical Data

Analytical Data: SB, AS, HG CORRELATE WITH AU IN BOTH SOILS AND DRILL CUTTINGS. BA, BE, BI, CD, CU, F, PB, MO, MN, AG, TL, W, ZN, TOTAL CARBON, AND TOTAL SULFUR HAVE ONLY LIMITED CORRELATION WITH AU.

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Materials

Ore: Gold
Gangue: Barite
Gangue: Hematite
Gangue: Calcite
Gangue: Quartz
Gangue: Limonite

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Comments

Comment (Geology): ALTERATION COMMENTS: MAJOR DECALCIFICATION, SILICIFICATION, CARBON REMOBILIZATION, AND IRON OXIDATION AND REDISTRIBUTION. MINOR BLEACHING, CALCITE VEINING, ARGILLIZATION. ALL ALTERATION TYPES OCCUR MAINLY UP DIP FROM THE FEEDER STRUCTURE. THE PARTIAL SOLUTION OF INTERSTITIAL CALCITE BY HYDROTHERMAL FLUIDS INCREASED PERMEABILITY IN THE HOST LIMESTONE ALLOWING GOLD-BEARING SOLUTIONS TO PENETRATE. DURING DECALCIFICATION, CARBON WAS ALSO REMOBILIZED, PRODUCING A BLACK, "SOOTY", CARBONACEOUS MATERIAL ALONG FRACTURES. SILICIFICATION VARIES FROM MINOR QUARTZ VEINING AND OVERGROWTHS ON QUARTZ GRAINS TO COMPLETE REPLACEMENT AS JASPEROID. JASPEROID DEVELOPMENT IS CONCENTRATED ALONG THE FEEDER FAULT AND AT THE CONTACT BETWEEN THE BASAL THICK BEDDED LIMESTONE AND THE OVERLYING LIMEY SILTSTONES. THE OXIDATION OF PYRITE AND SUBSEQUENT REMOBILIZATION OF IRON OXIDES HAVE PRODUCED SPECTACULAR BRICK-RED TO DARK YELLOW BROWN BANDING IN THE OXIDIZED, DECALCIFIED LIMESTONE. IN MANY AREAS THE ORE IS

Comment (Geology): INTENSELY LIESEGANG BANDED. MOST OF THE CALCITE VEINING IS CHARACTERIZED BY 0.1-30 CM VEINS LOCATED UP DIP FROM THE OREBODY. ARGILLIZATION IS RARE. ILLITIC CLAYS HAVE BEEN LOCALLY ALTERED TO MONTMORILLONITE AND ALLOPHANE. GEOLOGY COMMENTS: PETROGRAPHIC DATA SUGGEST THAT GOLD MINERALIZATION POSTDATES SILICIFICATION AND IS CONTEMPORANEOUS WITH, OR IMMEDIATELY POSTDATES, DECALCIFICATION. THREE ORE TYPES ARE KNOWN: 1) OXIDIZED, 2) JASPEROIDAL, AND 3) CARBONACEOUS. THE OREBODY CONSISTS MAINLY OF OXIDIZED ORE WITH SMALL AMOUNTS OF JASPEROIDAL AND CARBONACEOUS ORE. THE CARBONACEOUS ORES ARE TWICE THE GRADE OF THE OXIDE ORES.

Comment (Deposit): THE NEARBY GOLDSTONE, GOLD RIDGE, AND GOLD PICK OREBODIES WERE DISCOVERED BY ATLAS 1986-87. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT; 3 FIELD OBSERV

Comment (Commodity): AU OCCURS AS MICRON-SIZED GRAINS IN DECALCIFIED ZONES AND ALONG FRACTURES IN THE SILICIFIED ZONES. PETROGRAPHIC EXAMINATION AND METALLURGICAL TESTING INDICATE THAT THE AU IS NOT ENCAPSULATED BY SILICA.

Comment (Location): LOCATED ON THE SOUTHWEST FLANK OF THE ROBERTS MOUNTAINS. . INFO FROM LAND.ST :(1972)

Comment (Development): EXPL.COM: REGIONAL RECONNAISSANCE IN 1983 LED TO LAND ACQUISITION. IN LATE 1983, 16 WIDE- SPACED ROTARY HOLES WERE DRILLED. HOLE 11 INTERSECTED 5 FT./0.13 OPT AU. FOLLOW-UP MAPPING, SAMPLING, AND DRILLING WAS CONDUCTED IN THE SPRING OF 1984 IN THE VICINITY OF HOLE 11. HOLE 28, THE DISCOVERY HOLE, INTERSECTED 110 FT./0.138 OPT AU STARTING AT A DEPTH OF 15 FT. BELOW SURFACE. GRID DRILLING ON 100 FT. CENTERS BEGAN IN THE SUMMER OF 1984. 270 HOLES DEFINE THE GOLD BAR DEPOSIT. MINING BEGAN IN 1986. MINING AT GOLD BAR WAS COMPLETED IN 1990, ALTHOUGH STOCKPILED REFRACTORY ORE FROM THIS DEPOSIT WAS PROCESSED THROUGH THE MILL AFTER MINING CEASED. ; MILL.CAP: 3000 TPD. ; ECON.COM: MILL CONSTRUCTION WAS COMPLETED IN JANUARY, 1987 WITH AN INITIAL CAPACITY OF 1500 TPD. IT EMPLOYS CARBON-IN-LEACH TECHNOLOGY USING ACTIVATED CARBON WITH AU RECOVERIES OF >90%. EXPANSION OF MILL CAPACITY TO 3000 TPD WAS EXPECTED TO BE COMPLETED BY THE END OF 1988.

Comment (Deposit): THE OVERALL SHAPE OF THE DEPOSIT IS LIKE A FLATTENED CIGAR.

Comment (Workings): OPEN PIT

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References

Reference (Deposit): UNPUBLISHED DRAFT REPORT BY ATLAS PRECIOUS METALS, INC., 1988, NBMG DISTRICT FILE 106, ITEM 14.

Reference (Deposit): NBMG, 1988, THE NEVADA MINERAL INDUSTRY-1987, NBMG SPECIAL PUBLICATION MI-1987.

Reference (Deposit): BROILI, C., ET AL, 1988, GEOLOGY AND GOLD MINERALIZATION OF THE GOLD BAR DEPOSIT, EUREKA COUNTY, NEVADA, IN SCHAFER, R.W., ET AL, EDS., BULK MINEABLE PRECIOUS METAL DEPOSITS OF THE WESTERN UNITED STATES, THE GEOLOGICAL SOCIETY OF NEVADA, RENO, P. 57-72.

Reference (Deposit): MASINTER, R.A., 1991 ZONING OF ALTERED WALL ROCK AND SPATIAL RELATIONS TO GOLD ORE, GOLD BAR MINE, NEVADA, IN RAINES, G.L., ET AL, EDS. GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN, THE GEOLOGICAL SOCIETY OF NEVADA, RENO, P. 701-703.

Reference (Deposit): NBMG, 1991, THE NEVADA MINERAL INDUSTRY-1990, NBMG SPECIAL PUBLICATION MI-1990.

Reference (Deposit): TINGLEY AND SMITH, 1983, A MINERAL INVENTORY OF THE SHOSHONE-EUREKA RESOURCE AREA, BATTLE MOUNTAIN DISTRICT, NEVADA: NBMG OFR 83-3.

Reference (Deposit): TINGLEY AND SMITH, 1983, RESULTS OF GEOCHEMICAL SAMPLING WITHIN THE SHOSHONE-EUREKA RESOURCE AREA, EUREKA, LANDER, AND NYE COUNTIES, NEVADA: NBMG OFR 83-4.

Reference (Deposit): BONHAM, H.F., 1989, BULK-MIEABLE PRECIOUS-METAL DEPOSITS AND PROSPECTS IN NEVADA, NBMG MAP 91.

Reference (Deposit): NBMG MINING DISTRICT FILE 106, NUMEROUS PRESS CLIPPINGS.

Reference (Deposit): FINAL ENVIRONMENTAL ASSESSMENT - PROPOSED GOLD BAR EXPANSION PROJECT (NV64-EA9-74), BUREAU OF LAND MANAGEMENT, NOVEMBER 29, 1989.

Reference (Deposit): ATLAS CORPORATION, 1992, ANNUAL REPORT FOR FISCAL YEAR ENDED JUNE 30, 1992.

Reference (Deposit): ATLAS CORPORATION, 1991, ANNUAL REPORT FOR FISCAL YEAR ENDED JUNE 30, 1991.

Reference (Deposit): ATLAS CORPORATION, 1990, ANNUAL REPORT FORM 10-K FOR FISCAL YEAR ENDED JUNE 30, 1990.

Reference (Deposit): ATLAS CORPORATION, 1989, ANNUAL REPORT FOR FISCAL YEAR ENDED JUNE 30, 1989.

Reference (Deposit): ATLAS CORPORATION, 1986, ANNUAL REPORT FOR FISCAL YEAR ENDED JUNE 30, 1986.

Reference (Deposit): ATLAS CORPORATION, 1985, ANNUAL REPORT FOR FISCAL YEAR ENDED JUNE 30, 1985.

Reference (Deposit): NBMG, 1994, MI-1993

Reference (Deposit): NEVADA DIVISION OF MINERALS, 1994

Reference (Production): 1987: UNKNOWN 1988: ATLAS CORPORATION, 1988, ANNUAL REPORT FOR FISCAL YEAR ENDED JUNE 30, 1988. 1990: NBMG, 1991, THE NEVADA MINERAL INDUSTRY-1990, NBMG SPECIAL PUBLICATION MI-1990. NBMG MI-1993

Reference (Deposit): ATLAS CORPORATION, 1988, ANNUAL REPORT FOR FISCAL YEAR ENDED JUNE 30, 1988.

Reference (Deposit): ATLAS CORPORATION, 1987, ANNUAL REPORT FOR FISCAL YEAR ENDED JUNE 30, 1987.

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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.