Yerington Mine

Site Name

Primary: Yerington Mine
Secondary: Yerington
Secondary: Anaconda Copper
Secondary: Empire Nevada
Secondary: Macarthur
Secondary: Yerington Mountain
Secondary: Gallagher
Secondary: Weed Heights

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Commodity

Primary: Copper
Secondary: Iron
Secondary: Gold
Tertiary: Molybdenum
Tertiary: Silver
Tertiary: Uranium

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Location

State: Nevada
County: Lyon
District: Mason

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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.
Administrative Organization: Carson City BLM Administrative District

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Holdings

Type: Patented

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Workings

Not available

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Ownership

Owner Name: Quaterra Resources Inc
Percent: 100.0
Home Office: Vancouver, Canada
Info Year: 2009
Years: 2005 -

Owner Name: Arimetco International, Inc.
Percent: 100.0
Home Office: Arizona
Info Year: 1996

Owner Name: Don Tibbals
Company ID: 2600085
Percent: 100.0
Home Office: Nevada
Info Year: 1985

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Production

Year: 1976
Description: Sulphide Ore 6 Mo End 6/30/76 Cu=0.49% 2146000 Mt Ore Processed
Year: 1975
Description: Sulphide Ore/ 0.51% Cu (Mill Feed) 4401000 Mt Ore Processed
Year: 1976
Description: Oxide Ore 6 Mo End 6/30/76 Cu = 0.49% 2038000 Mt Ore Processed
Year: 1975
Description: Oxide Ore/ 0.37% Cu (Mill Feed) 5263000 Mt Ore Processed
Year: 1974
Description: Sulphide Ore/ 0.53% Cu (Mill Feed) 4368000 Mt Ore Processed
Year: 1974
Description: Oxide Ore/ 0.38% Cu (Mill Feed) 5341000 Mt Ore Processed
Year: 1973
Description: Sulphide Ore/ 0.53% Cu (Mill Feed) 4432000 Mt Ore Processed
Year: 1973
Description: Oxide Ore/ 0/36% Cu (Mill Feed) 5146000 Mt Ore Processed
Year: 1972
Description: Sulphide Ore/ 0.53% Cu (Mill Feed 4334000 Mt Ore Processed
Year: 1972
Description: Oxide Ore/ 0/51% Cu (Mill Feed) 4153000 Mt Ore Processed
Year: 1971
Description: Oxide Ore/ 0.51% Cu (Mill Feed) 4095000 Mt Ore Processed
Year: 1971
Description: Sulphide Ore/ 0.58% Cu (Mill Feed) 4298000 Mt Ore Processed
Year: 1970
Description: Sulphide/ 0.68% Cu (Mill Feed) 4216000 Mt Ore Processed
Year: 1970
Description: Oxide/ 0.52% Cu (Mill Feed) 3885000 Mt Ore Processed
Year: 1969
Description: Sulphide/ Gross Cu Metal In Concentrat 9635 Mt Cu Content
Year: 1969
Description: Oxide/ Gross Cu Metal In Precipitates 22719 Mt Cu Content
Year: 1968
Description: Sulphide/ Gross Cu Metal In Concentrat 18952 Mt Cu Content
Year: 1968
Description: Oxide/ Gross Cu Metal In Precipitates 17123 Mt Cu Content
Year: 1967
Description: Sulphide/ Coppper In Concentrates 8511 Mt Cu Content
Year: 1967
Description: Oxide/ Gross Cu Metal In Precipitates 14051 Mt Cu Content
Year: 1966
Description: Sulphide/ Gross Cu Metal In Precipitat 13647 Mt Cu Content
Year: 1966
Description: Oxide/ Gross Cu Metal In Precipitates 22154 Mt Cu Content
Year: 1965
Description: Sulphide/ Copper In Concentrates 14322 Mt Cu Produced
Year: 1964
Description: Sulphide/ Copper In Concentrates 15969 Mt Cu Produced
Year: 1965
Description: Oxide/ Copper In Precipitates 20612 Mt Cu Produced
Year: 1964
Description: Oxide/ Copper In Precipitates 18448 Mt Cu Produced
Year: 1963
Description: Sulphide/ Copper In Concentrates 16885 Mt Cu Produced
Year: 1963
Description: Oxide/ Copper In Precipitates 22296 Mt Cu Produced
Year: 1962
Description: Oxide/ Copper In Precipitates 23919 Mt Cu Produced
Year: 1962
Description: Sulphide/ Copper In Concentrates 9635 Mt Cu Produced
Year: 1961
Description: Sulphide/ Copper In Concentrates 2275 Mt Cu Produced
Year: 1961
Description: Oxide/ Copper In Precipitates 26200 Mt Cu Produced
Year: 1960
Description: Oxide/ Coppper In Precipitates 38733 Mt Cu Produced
Year: 1958
Description: Oxide/ Copper In Precipitates 24165 Mt Cu Produced
Year: 1959
Description: Oxide/ Copper In Precipitates 18347 Mt Cu Produced
Year: 1957
Description: Oxide/ Copper In Precipitates 25547 Mt Cu Produced
Year: 1956
Description: Oxide/ Copper In Precipitates 29493 Mt Cu Produced
Year: 1955
Description: Oxide/ Copper In Precipitates 32045 Mt Cu Produced
Year: 1954
Description: Oxide/ Copper In Precipitates 24608 Mt Cu Produced
Year: 1953
Description: Oxide/ Copper In Precipitates 8394 Mt Cu Produced

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Deposit

Record Type: Deposit
Operation Category: Past Producer
Deposit Type: Porphyry Cu
Plant Type: Beneficiation (Mill)
Plant Subtype: Flotation
Operation Type: Surface
Mining Method: Open Pit
Milling Method: Flotation
Year First Production: 1953
Discovery Year: 1865
Years of Production:
Organization:
Significant: Y

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Physiography

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

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Mineral Deposit Model

Model Name: Porphyry Cu
Model Name: Skarn Cu

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Orebody

Name: Elongate Distorted "V" Shape

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Structure

Type: L
Structure: FAULTS WHICH CUT THE ORE BODY ARE OF MINOR DISPLACEMENT.

Type: L
Structure: THE ELONGATION OF THE ORE BODY IS PROBABLY RELATED TO A PRE-EXISTING STRUCT

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Alterations

Alteration Type: L
Alteration: ALBITIC AND POTASSIC ALTERATION WITH CHALCOPYRITE

Alteration Type: L
Alteration: PORPHYRY IS INTENSELY SILICIFIED IN HIGH GRADE ZONE

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Rocks

Name: Andesite
Role: Associated
Description: Dikes
Age Type: Associated Rock
Age Young: Late Cretaceous

Name: Tonalite
Role: Associated
Description: Dikes
Age Type: Associated Rock
Age Young: Late Cretaceous

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Tertiary

Name: Granodiorite
Role: Associated
Age Type: Associated Rock
Age Young: Middle Jurassic

Name: Andesite
Role: Host
Description: Hornblende
Age Type: Host Rock
Age Young: Tertiary

Name: Andesite
Role: Host
Description: Breccia
Age Type: Host Rock
Age Young: Tertiary

Name: Felsic Volcanic Rock
Role: Host
Age Type: Host Rock
Age Young: Triassic

Name: Tuff
Role: Host
Description: Andesitic
Age Type: Host Rock
Age Young: Triassic

Name: Andesite
Role: Host
Description: Flows
Age Type: Host Rock
Age Young: Triassic

Name: Limestone
Role: Host
Age Type: Host Rock
Age Young: Triassic

Name: Porphyry
Role: Host
Age Type: Host Rock
Age Young: Middle Jurassic

Name: Quartz Monzonite
Role: Host
Description: Yerington batholith (3 phases oldest to youngest: McLeod Hill quartz monzodiorite, Bear quartz monzonite, Luhr Hill Granite). 55-69 wt% SiO2, high-K, rocks sit at boundary between alkali-calcic and calc-alkaline
Age Type: Host Rock Unit
Age in Years: 169.400000+-0.400000
Dating Method: U-Pb (zircon)
Age Young: Middle Jurassic

Name: Dacite
Role: Associated
Description: Dikes
Age Type: Associated Rock
Age Young: Late Cretaceous

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Analytical Data

Analytical Data: Overall Avg Cu content is less than 1%

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Materials

Ore: Chalcopyrite
Ore: Pyrite
Ore: Bornite
Ore: Covellite
Ore: Chrysocolla
Ore: Cuprite
Ore: Tenorite
Ore: Malachite
Ore: Azurite
Ore: Chalcocite
Ore: Copper
Ore: Melaconite
Ore: Magnetite
Ore: Feldspar
Ore: Quartz
Ore: Albite
Ore: Sericite
Gangue: Biotite
Gangue: Sphalerite

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Comments

Comment (Deposit): Associated Deposits: Casting Copper (skarn), Douglas Hill (skarn), Bluestone (skarn), Mason Valley (skarn), McConnel Mine (skarn), MacArthur (porphyry), Bear-Lagomarsino (porphyry), Buckskin Mine (Au-Cu veins), Ludwig Mine (carbonate replacement/skarn)

Comment (Ownership): In 1982 Don Tibbals Reached An Agreement To Purchase The Yerington Property From Anaconda Meinerals Co., Denver ,Co. At The Time Tibbals Planned To Convert Most Of The 8,143 Acres Into An Industrial Park Consisting Of About 50 Industrial Buildings, 170 Homes, 20 Apartments, Recreational Buildings, And Utilities Including A Sewage System.

Comment (Deposit): Major Alteration Types: Pre-main stage endoskarn (garnet, albite ? clinopyroxene); main stage potassic (biotite ? K-feldspar), sodic-calcic (actinolite, sodic plagioclase), propylitic (actinolite, chlorite); late stage sericitic, sodic, chloritic. Alteration Zoning: Likely contemporaneous central potassic with deeper and lateral sodic-calcic with peripheral propylitic; albitic (albite-chlorite) and sericitic alteration overprint the earlier alteration with sericitic alteration increasing at shallower levels. Major Vein types and Relative Ages: Common veins oldest to youngest in ore zone: quartz?K-feldspar; chalcopyrite ? pyrite or bornite ?quartz ? chlorite; epitdote ? quartz ? chlorite + chalcopyrite ? pyrite or bornite; epidote + quartz ? chlorite + chalcopyrite ? pyrite or bornite; pyrite ? quartz ? chalcopyrite ? tourmaline. Metal Zoning: central magnetite-bornite ?chalcopyrite, or ?chalcocite/digenite. Outer chalcopyrite- ?magnetite ?pyrite and outermost pyrite.

Comment (Commodity): Ore Materials: chalcopyrite, pyrite, bornite, covellite, chrysocolla, cuprite, tenorite, malachite, azurite, chalcocite (minor), native copper, melaconite, magnetite.

Comment (Commodity): Gangue Materials: the ore body has low pyrite content, essentially no Au or Mo. Molybdenite has been seen in the mine only 12 to 15 times by Anaconda geologists. There is no Au, Ag, Mo trace element zoning. K-spar, biotite, quartz veining. Bornite is associated with high K-spar alteration. There is no trace of pyrrhotite, sphalerite, or galena in the ore body. In the root zone (present east end) albite flooding is recognized. The west end (top) was higher in pyrite, especially along certain structural zones. Along these zones a chalcocite enrichment blanket was formed. Bornite is present with chalcopyrite in the "middle" zone. The top (now west) is characterized by sericite, chalcopyrite, and pyrite.

Comment (Economic Factors): Yerington is considered by the USGS to be one of the ?Giant Porphyry-Related Metal Camps of the World.? From 1953 through 1996, the Yerington Copper open pit mine produced 1.75 billion pounds of copper metal from 162 million tons of ore with average grade of 0.54% Cu. The mine also produced more than 11,450 kilograms of gold and 164,720 kilograms of silver.

Comment (Geology): The "A" porphyry is altered quartz monzonite porphyry. The "B" porphyry is high in mafic minerals and plagioclase; it is pre-mineralization and accompanies the porphyritic quartz monzonite. Age dating (K-Ar) at Yerington indicates 150 Ma for all events related to intrusion and mineralization. -can't separate main intrusion from later mineralization age, etc. The host rock granodiorite and biotite and hornblende porphyries are indistinguishable by K-Ar age dating methods. The whole system evolved over 4-5 m.y. Copper is associated separately with each porphyry - that is, although the sulfides do not come in with the magma, they follow it very closely, and each porphyry has its own related copper mineralization. Contacts between different porphyry phases are knife-edge sharp, indicating multiple intrusion. Definite E -W-trending swarm of pre- and post-mineralization dikes. No deep rocks were brought to the surface by venting, etc....with the exception of the Yerington mine, essentially all of the districts production has been from rocks of Triassic age.

Comment (Identification): All material from earlier MRDS records M035859 and MP90064 has been incorporated into the current record, as well as additional new information.

Comment (Location): The Yerington Copper Mine is located in the flat area just west of the Walker River, east of the Singatse Range.

Comment (Workings): Large open pit more than a mile long and a half mile wide, elongate WNW-ESE

Comment (Commodity): 50 % Of The Ore Is Copper Oxide Minerals. Production Was About 25,000 - 30,000 Tpd Ore, And An Equal Amount Of Waste Was Mined. Sulfide Finely Disseminated And In Narrow Seams

Comment (Development): Copper mineralization was discovered in the Singatse Range west of Yerington in 1865 resulting in the development of many small hand-dug mines. In 1941, International Smelting and Refining Company, a subsidiary of Anaconda Copper Company, acquired the property. During the ensuing four years, exploration confirmed the presence of approximately 60,000,000 tons of ore with copper content ranging from 0.9% to 0.95%. In 1951, Anaconda took direct control of the Yerington site and began construction and installation of equipment for mining operations. Anaconda actively mined the site from 1953 into 1978. In 1977, the Atlantic Richfield Company (ARCo) purchased a number of holdings from Anaconda, including the Yerington site, just as it was planning to close down. ARCo closed the site on June 30, 1978. In 1978, ARCo sold all of its holdings at the site, including the townsite of Weed Heights, to Don W. Tibbals. Tibbals subsequently leased portions of the property site to other companies who conducted various mining and copper processing activities. From 1978 through the present, the U.S. Bureau of Land Management ( BLM), the U.S. Geological Survey and the Nevada Division of Environmental Protection (NDEP) and the U.S. Environmental Protection Agency (EPA) have identified a variety of environmental concerns at the Yerington mine site including contamination of groundwater with heavy metals and, some cases, radionuclides (uranium and thorium). Approximately half of the land at the Yerington mine site was and is currently managed by the BLM. In 1988, Tibbals sold a large portion of his land and unpatented mining claims to the Arizona Metals Company (dba Arimetco) who operated the site from 1989 to 1996, producing copper from a solvent extraction electrowinning (SX-EW) process. In January 2000, faced with government enforcement actions, fines, falling copper prices, and other financial problems, Arimetco abandoned the Yerington operations and declared bankruptcy. In March 2002, NDEP, BLM and EPA signed a Memorandum of Understanding (MOU) headed by NDEP but also defining how the agencies would work together in the oversight of the old mine site. In January 2005, the EPA agreed to become the regulatory lead agency for investigation and cleanup at the Yerington Mine site. EPA will continue to coordinate with NDEP and BLM as it proceeds forward ensuring the cleanup progresses. Primarily as a result of Arimetco's failure at Yerington, substantially stronger requirements for corporate guarantees as an acceptable instrument for financial assurance were adopted in 2001. Annual reviews of corporate guarantees were required by regulation in 2002. ?The BLM regulations governing mining were first adopted in 1981 and amended in 1998 and 2000. Among other things, these require quarterly inspections of mines on public lands to ensure compliance with all permit conditions. ?Every mining operation on public land is now subject to the National Environmental Policy Act, which provides opportunity for public comment during the planning process for a mine.

Comment (Deposit): The Yerington ore body has been tilted on its side, until the original top of the body is now at the west end. The tilting dips west 70 degrees, as measured by the Tertiary-pre-Tertiary contact which lies at this angle to the west of the mine. 6,000 to 7,000 feet of vertical section of the deposit is exposed because of this tilting. MacArthur forms part of the famous Yerington porphyry copper district which includes three deposits with historical resources totaling approximately 1.2 billion tons of ore averaging approximately 0.45% Cu. The root zone and core of the deposit produced oxide minerals high in copper-silicates with the silica derived from the decomposition of plagioclase. No chalcocite blanket developed because of low original pyrite content of the deposit. Chrysocolla is the dominant oxide mineral here. About half of the ore is copper oxide minerals. Production was about 25,000 - 30,000 tpd ore, with an equal amount of waste mined. Sulfide minerals are finely disseminated and in narrow seams.

Comment (Reserve-Resource): Oxide Resource Est 15.6 Million Mt @ 0.32 % Cu. Former Owner Was Anaconda Co. 1991 Mas Reserves, Cu:(Randol 1993/94) Oxide: 0.22 Wt-Pct - 81,850,000 Mt Ore Sulfide: 0.36 Wt-Pct - 68,940,000 Mt Ore

Comment (Deposit): General Location Is About 53 Km SE Of Carson. Mining Method Is Open Pit. Mill Is Dismantled. Past Prod. 177,000 Mt Cu From 144 Million Mt Ore (179). Pit Extends Omtp M/2 Sec. 21 And The Se/4 Sec. 17.

Comment (Geology): The Yerington Ore Body Is A Porphyry Copper Deposit. It Is Roughly Conformable To Its Host, A Quartz Monzonite Stock That Pitches About 5 Degrees Nw. Originally, In Mesozoic Time, The Cylindroid Shaped Stock Was Emplaced As A Steeply Pitching Body With Its Long Axis Dipping To The East. Since Miocene Time, The Body Has Been Rotated 60 Degrees To The West Resulting In Its Present, Gently Pitching Position. The Northern Edge Of The Ore Body Dips Steeply To The North, While The Southern Edge Dips North At A More Modderate Angle. A North-South Cross-Sectional View Varies From A Flat-Lying Lens On The East To A Distorted Inverted V Shape Toward The West. General Size Of Ore Body Is Large.

Comment (Reserve-Resource): Matrix 1 Is Tonnage And Grade Of Pit Sulphide Ore. Matrix 2 Is Tonage And Grade Of Acid Soluble (Oxide) Ore. Reflects Production For 1977 And 1978 Matrix 3 Is Tonnage And Grade Est. Of Flotation Tailing In Percent Total Cu From Sulfide Mill. Matrix 4 Is Tonnage And Grade Est. Of Leach Tailings In Percent Total Cu From Leach Vat. Reflects Production For 1977 And 1978. Dump Leaching--No Tonnages Available. Column 4 Reflects Production For 1977 And 1978.

Comment (Economic Factors): According To The 1995 Annual Report The Yerington Pit Is Currently Flooded.

Comment (Geology): Silver Is Negligible: Gold And Silver Content Is Inconsequential

Comment (Production): June 30, 1978, Is The Date Proposed By Anaconda For Permanent Termination Of Work At The Yerington Mine And Mill Site Early Production - Although Copper Was Discovered In The Yerington District In 1865, There Was Little Production Untill 1912 When A Smelter And Connecting Railroad Were Built. By 1930, When Mining Virtually Ceased, Over 52,600 Tonnes Of Copper Had Been Produced From Ore Averaging 2% Cu.

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References

Reference (Deposit): Jurassic Magmatism and Metal Deposits in Western Nevada, 2002, Spring Field Trip Guidebook, Geological Society of Nevada Special Publication No. 35.

Reference (Deposit): Northern Miner, Aug. 6, 1990

Reference (Deposit): Pay Dirt, Sept. 1989

Reference (Deposit): Knopf, Adolph, 1918, Geology and Ore Deposits of the Yerington District, Nevada: U.S. Geological Survey Professional Paper 114, 68p

Reference (Deposit): Nevada Mining Associatio, 2005, Yerington Message Points

Reference (Deposit): Felix E. Mutschler, Steve Ludington, and Arthur A. Bookstrom, 1999, Giant Porphyry-Related Metal Camps of the World-A Database; USGS Open-File Report 99-556. U.S. Bureau of Mines, files

Reference (Deposit): Jacky, W. Copper Precipitation Methods At Weed Heights. Min. Eng., V. 19, No. 6, 1967, Pp. 70-74.

Reference (Deposit): Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.

Reference (Reserve-Resource): Arimetco Int'L Inc. 1995 Annual Report, P.7.

Reference (Reserve-Resource): EandMj. Arimetco Bets On Oxide-Ore Bargains. February, 1992. Pp. C8-C11.

Reference (Reserve-Resource): Arimetco News Release. June 9, 1994.

Reference (Reserve-Resource): Arimetco News Release. February 20, 1995.

Reference (Reserve-Resource): For Yerington. Nov. 1982, P. 45.

Reference (Reserve-Resource): Arimetco Int'L. Inc. 1993, Ar. P. 5.

Reference (Deposit): Smith, M. C. Methods And Operations At The Yerington Copper Mine And Plant Of The Anaconda Company, Weed Heights, Nevada. Bumines Ic 7848, 1958, 37 Pp.

Reference (Deposit): World Mining (San Francisco) What'S Going On In World Mining - United States: Nevada; Yerington District Will Be A Major Future Porphyry Copper Producer. V. 29, No. 3, 1976, P. 82.

Reference (Deposit): World Mining (San Francisco) Oil Company, Arco, Purchases Copper Company. V. 30, No. 2, 1977, Pp. 64-68. June 15, 1977, Pp. 1-2.

Reference (Deposit): Einaudi, M. Yerington Skarns; Field Trip 10, Skarn Deposits. Paper In Exploration For Ore Deposits Of The North American Cordillera. Field Trip Guidebook, Ed. By J. L. Johnson. Symp. Of Assoc. Expl. Geochem., Reno, Nv, March 25-28, 1984, Pp. 31-39.

Reference (Deposit): Atlantic Richfield Co. Form 2-14 Registration Statement. Securities And Exchange Commission, 1976, P. 60-68.

Reference (Deposit): Einaudi, M. Description Of Skarns Associated With Porphyry Copper Plutons. Paper In Advances In Geology Of The Porphyry Copper Deposits, Southwestern North America, Ed. By S. R. Titley. Univ. Az Press, Tucson, Az, 1982, Pp. 145-148.

Reference (Deposit): Big Sky Pay Dirt (Bisbee, Az). Anaconda Reviewing Bids For Yerington. Nov. 1982, P. 42.

Reference (Deposit): Dilles J H, Solomon G C, Taylor H P, Einaudi M T 1992 - Oxygen and Hydrogen isotope characteristics of hydrothermal alteration at the Ann-Mason Porphyry Copper deposit, Yerington, Nevada: in Econ. Geol. v87 pp 44-63

Reference (Deposit): Ransome, F. L. The Yerington Copper District, Nevada. Paper In Contributions To Economic Geology, 1908, Pt. 1, Ed. By C. W. Hayes And W. Lindgren. U.S. Geol. Surv. Bulletin 380, 1909, Pp. 99-119.

Reference (Deposit): Ramsey, R. H. Weed Heights: Anaconda'S Nevada Project -New Approach To Copper Mining. Eng. And Min. J., V. 155, No. 8, 1954, Pp. 74-93.

Reference (Deposit): Nevada Mining Association (Reno). Newsletter No. 291, June 15, 1977, Pp. 1-2.

Reference (Deposit): Proffett, J. M. And J. H. Dilles. Geologic Map Of The Yerington District, Nevada. Nv Bureau Of Mines And Geol., Univ. Of Nv, Reno, Map 77, 1984.

Reference (Deposit): Dilles J H 1987 - Petrology of the Yerington Batholith, Nevada: Evidence for evolution of Porphyry Copper ore fluids: in Econ. Geol. v82 pp 1750-1789

Reference (Deposit): Moore, J. G. Geology And Mineral Deposits Of Lyon, Douglas, And Ormsby Counties, Nevada. Nv Bureau Of Mines And Geol. Bulletin 75, 1969, 45 Pp.

Reference (Deposit): Knofp, A. Geology And Ore Deposits Of The Yerington District, Nevada. U.S. Geol. Surv. Prof. Paper 114, 1918, Pp. 64-65.

Reference (Deposit): Huttl, J. B. Anaconda Adds 5,000 Tpd Concentrator To Yerington Enterprise At Weed Heights. Eng. And Min. J., V. 163, No. 3, 1962, Pp. 75-85.

Reference (Deposit): Howard, K. L. Jr. Geology Of The Yerington Mine, Lyon County, Nevada. Econ. Geol. And Bulletin Soc. Econ. Geol., V. 71, No. 3, 1976, P. 700.

Reference (Deposit): Engineering And Mining Journal. Yerington Mine Starts Production. V. 155, No. 1, 1954, P. 112-113, 116, 168.

Reference (Deposit): Carten R B 1986 - Sodium-Calcium metasomatism: chemical, temporal, and spatial relationships at the Yerington, Nevada, Porphyry Copper deposit: in Econ. Geol. v81 pp 1495-1519

Reference (Deposit): The Mining Record, Vol 107, #43, Oct 23, 1996, P3.

Reference (Deposit): Engel, A. L. Preliminary Tests Of Nevada Oxidized Copper Per Ores. Bumines Ri 4952, 1953, 6 Pp.

Reference (Deposit): Stoddard, C., And J. A. Carpenter. Mineral Resources Of Storey And Lyon Counties, Nevada. Nv Bureau Of Mines And Geol. Bulletin 49, 1950, P. 89.

Reference (Deposit): Smith, M. C. Methods And Operations At The Yerington Copper Mine And Plant Of The Anaconda Company, Weed Heights, Nevada. Bumines Ic 7848, 1958, 37 Pp.

Reference (Deposit): Dilles J H, Einaudi M T 1992 - Wall-rock alteration and hydrothermal flow paths about the Ann-Mason Porphyry Copper deposit, Nevada - a 6-km vertical reconstruction: in Econ. Geol. v87 pp 1963-2001

Reference (Deposit): Harris N B, Einaudi M T 1982 - Skarn deposits in the Yerington District, Nevada: metasomatic skarn evolution near Ludwig: in Econ. Geol. v77 pp 877-898

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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.