Yankee Mine

Site Name

Primary: Yankee Mine
Secondary: Lincoln Pit
Secondary: Blue Pit
Secondary: Gray Pit
Secondary: Lee Pit
Secondary: Monitor Pit
Secondary: Olustee Pit
Secondary: Davis Pit
Secondary: Saddle Pit
Secondary: West Spur Pit
Secondary: East Spur Pit
Secondary: West Crusher Pit
Secondary: Hilltop Pit
Secondary: Rebel Pit
Secondary: Rifle Pit
Secondary: Southeast Extension Pit
Secondary: Union Gray

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Commodity

Primary: Gold
Secondary: Silver

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Location

State: Nevada
County: White Pine
District: Yankee Basin

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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.
Administrative Organization: Ely BLM district

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: USMX, Inc.
Percent: 100.0
Home Office: Colorado
Info Year: 1996

Owner Name: Placer Dome U. S. Inc.
Percent: 100.0
Home Office: California
Info Year: 1996
Years: 1993 -

Owner Name: Placer Dome U. S., Inc.
Info Year: 2004

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Production

Year: 1995
Description: Gold Production 96608 T Oz/Yr Gold
Year: 1992
Description: Ore Production (0.045 Oz Au/St) 600000 St/Yr
Year: 1992
Description: Gold Production 21000 Oz/Yr
Year: 1992
Description: Gold 10921 Oz
Year: 1993
Description: Gold 11272 Oz
Year: 1994
Description: Gold 39953 Oz
Year: 1995
Description: 1995 Gold Production 36896 T Oz/Yr Gold
Year: 1995
Description: See Bald Mountain For Future Production
Year: 1994
Description: No Gold Production
Year: 1993
Description: Kg, Gold 3184 Kg, Gold
Year: 1992
Description: Kg, Gold 2961 Kg, Gold
Year: 1991
Description: Kg, Gold 2910 Kg, Gold
Year: 1990
Description: Kg, Gold 2508 Kg, Gold
Year: 1989
Description: Kg, Gold 2395 Kg, Gold
Year: 1988
Description: Kg, Gold 2163 Kg, Gold
Year: 1987
Description: Kg, Gold 1431 Kg, Gold
Year: 1986
Description: Kg, Gold 812 Kg, Gold
Year: 1985
Description: Kg, Gold 373 Kg, Gold
Year: 1984
Description: Kg, Gold 453 Kg, Gold
Year: 1983
Description: Kg, Gold 74 Kg, Gold

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Deposit

Record Type: Site
Operation Category: Producer
Deposit Type: sediment-hosted gold
Plant Type: Leach
Plant Subtype: Hydromet
Operation Type: Surface
Mining Method: Open Pit
Milling Method: Heap Leach-Agglomerate-Carbon Column-Electrowin
Year First Production: 1992
Year Last Production: 2004
Years of Production:
Organization:
Significant: Y
Deposit Size: S

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Physiography

Not available

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Mineral Deposit Model

Model Name: Sediment-hosted Au

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Orebody

Not available

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Structure

Type: L
Description: Ore is associated with a NW-trending anticline. Mineralization is controlled locally by a series of near-vertical faults that trend east to northeast,

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Alterations

Alteration Type: L
Alteration Text: Host rocks are silicified and decalcified the host rock. Decalcification is pervasive enough to form zones of up to 8-% remnant illite clay. Silicification ranges from minor to complete jasperoid formation. Mineralization is intimately associated with jasperoid formation. Intense liesegang banding is regional.

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Rocks

Name: Limestone
Role: Host
Age Type: Host Rock
Age Young: Late Devonian
Age Old: Middle Devonian

Name: Limestone
Role: Host
Age Type: Host Rock
Age Young: Late Devonian
Age Old: Early Mississippian

Name: Siltstone
Role: Host
Age Type: Host Rock
Age Young: Late Devonian
Age Old: Early Mississippian

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Analytical Data

Not available

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Materials

Ore: Gold
Ore: Hematite
Ore: Jarosite
Gangue: Limonite

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Comments

Comment (Economic Factors): In 1992, the Yankee deposit was reported to contain 683,000 ounces of gold. In 1992, the Yankee Mine produced 25,800 ounces of gold. Since Placer Dome U. S., Inc. acquired the Yankee Mine in 1993, its production has been included with that of the Bald Mountain Mine.

Comment (Identification): This record includes all material from earlier record # RE00280 which should be deleted from the database. The Yankee Mine is part of Placer Dome?s Bald Mountain Mine project.

Comment (Location): The Yankee Mine is in the southernmost part of the Bald Mountain Mining District about five miles south of the Alligator Ridge Mine. The mined area consists of several orebodies aligned in a NNW trend extending over about a mile and a half from north to south.

Comment (Workings): The Yankee Mine is an open pit/heap leach/carbon adsorption operation.

Comment (Deposit): The Yankee mine has been generally considered a ?Carlin-Type ? disseminated gold deposit. The ore is distributed in about 16 separate orebodies ranging in size from about 35,000 tons to 900,000 tons of ore, averaging about 0.050 ounces of gold per ton of ore. Gold is associated with silicification and decalcification of the host rock. Ore is controlled both structurally and stratigraphically. The 16 or so orebodies at Yankee are aligned N20W along the west flank of a NW-trending anticline. Mineralization is controlled locally by a series of near-vertical faults that trend east to northeast, or perpendicular to the anticlinal axis. Stratigraphically, the ore is contained within the basal 100 feet of the Pilot Shale, which here consists of siltstone and limestone. The Devils Gate Limestone hosts minor gold mineralization. Mineralization is intimately associated with jasperoid formation.

Comment (Development): the Yankee deposit was first discovered by AMSELCO in the late 1970s. Kennecott began production form the mine area in 1989. USMX operated the mine from 1991. USMX poured its first gold on June 24, 1992. Total mill capacity was 500 gpm. The cash cost of production in 1992 was predicted to be $293/oz Au. Recovery was projected to be 75%. Yankee carbon will be processed at the Alligator Ridge refinery. Discovery cost through 1991 was approximately $5.85 per proven mineable ounce of gold. In 1993, Placer Dome U. S., Inc. acquired the Alligator Ridge holdings from USMX, Inc. and subsequently, the Yankee Mine's production was included with Bald Mountain Mine's production. Placer Dome includes this mine area as part of its Mooney Basin Project. The Mooney Basin facility was commissioned in 1999 and ore deliveries from the Top pit Stage 7 to this facility are scheduled. Leaching should continue through 2009.

Comment (Commodity): Ore Materials: gold

Comment (Commodity): Gangue Materials: Limonite, hematite, jarosite, arsenic oxides.

Comment (Exploration): PLACER DOME DID SOME RESOURCES DELINIATION DRILLING IN 1995.

Comment (Reserve-Resource): RESERVES FROM RANDOL 1993/94.

Comment (Production): 1995 PRODUCTION FROM RANDOL, 1996/97; ALSO INCLUDED IN BALD MT 0320330503 MAS PROPERTY PRODUCTION:

Comment (Economic Factors): LOADED CARBON SENT TO NEAR-BY BALD MOUNTAIN/ALLIGATOR RIDGE MILL.

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References

Reference (Deposit): Hitchborn and others, 1996, Geology and Gold Deposits of the Bald Mountain Mining District, White Pine County, Nevada, in Geology and Ore Deposits of the American Cordillera Symposium Proceedings, eds. A. Coyner and P. Fahey.

Reference (Deposit): Stout, Bill, 1996, Geologic Overview of the Yankee Mine, White Pine County, Nevada, in The Geological Society of Nevada 1996 Spring Field Trip, Geology and Gold Deposits of Eastern Nevada, GSN Special Publication No. 23.

Reference (Deposit): Hose, Blake, and Smith, 1976, Geology and Mineral Resources of White Pine County, Nevada, NBMG Bulletin 85.

Reference (Deposit): USMX, 1992, Annual Report for 1991.

Reference (Deposit): "USMX Yankee Mine in Nevada Starts Gold Production", Skillings Mining Review, July 18, 1990.

Reference (Deposit): NBMG, MI-90 thru MI-02

Reference (Deposit): NBMG Map 91, 2nd, 3rd

Reference (Deposit): DEIS, 1995

Reference (Deposit): FEIS, 1995

Reference (Deposit): Amer. Mines (1991-92), 1991 thru Amer. Mines (2000), 1999

Reference (Deposit): Nevada Land Status Map, 1990.

Reference (Deposit): Nutt, C.J., Hofstra, A.H., Hart, K.S., and Mortensen, J.K., 2000, Structural setting and genesis of gold deposits in the Bald Mountain-Alligator Ridge area, east-central Nevada, in Cluer, J.K., Price, J.G., Struhsacker, E.M., Hardyman, R.F., and Morris, C.L., eds., Geology and Ore Deposits 2000: The Great Basin and Beyond: Geological Society of Nevada Symposium Proceedings, May 15-18, 2000, p. 513-537.

Reference (Deposit): RANDOL MINING DIRECTORY, 1994/95, U.S. MINES & MINING COMPANIES, P360.

Reference (Deposit): AMERICAN MINES HANDBOOK, 1996, P195.

Reference (Deposit): PLACER DOME INC., 1996 FORM 40-F, PP. 13-16, 21-22.

Reference (Production): RANDOL MINING DIRECTORY, 1996/97, U.S. MINES & MINING COMPANIES, P280.

Reference (Reserve-Resource): RANDOL MINING DIRECTORY, 1993/94, U.S. MINES & MINING COMPANIES, P295.

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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.