Pumpkin Hollow Copper Project

Site Name

Primary: Pumpkin Hollow Copper Project
Secondary: Lyon Prospect
Secondary: Lyon copper-magnetite property
Secondary: E-2
Secondary: East
Secondary: North
Secondary: Northwest
Secondary: South
Secondary: Southeast

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Commodity

Primary: Copper
Secondary: Iron
Secondary: Gold

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Location

State: Nevada
County: Lyon
District: Yerington 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.
Administrative Organization: Carson City BLM Administrative District

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: Nevada Copper Corp.
Percent: 100.0
Home Office: Suite 1238, 200 Granville Street Vancouver, BC Canada V6C 1S4 Telephone: (604) 683-8992 Email: [email protected]
Info Year: 2006
Years: 2005 -

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: contact metasomatic
Operation Type: Surface
Discovery Year: 1960
Discovery Method: Airborne Magnetic Survey
Years of Production:
Organization:
Significant: Y
Deposit Size: L

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Physiography

Not available

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Mineral Deposit Model

Model Name: Skarn Cu

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Orebody

Not available

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Structure

Type: R
Description: batholith

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Alterations

Not available

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Rocks

Name: Quartz Monzonite
Role: Host
Age Type: Host Rock
Age Young: Cretaceous

Name: Granodiorite
Role: Host
Age Type: Host Rock
Age Young: Cretaceous

Name: Hornfels
Role: Host
Description: calc-silicate
Age Type: Host Rock
Age Young: Triassic

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

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

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Analytical Data

Not available

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Materials

Ore: Copper
Ore: Covellite
Ore: Chrysocolla
Ore: Malachite
Ore: Azurite
Ore: Chalcocite
Ore: Bornite
Ore: Magnetite
Ore: Pyrite
Ore: Chalcopyrite
Gangue: Pyroxene
Gangue: Calcite
Gangue: Quartz
Gangue: Wollastonite
Gangue: Epidote
Gangue: Garnet

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Comments

Comment (Commodity): Ore Materials: chalcopyrite, pyrite, magnetite, bornite, chalcocite, azurite, malachite, chrysocolla, covellite, native copper

Comment (Commodity): Gangue Materials: garnet, epidote, wollastonite, quartz, calcite, pyroxene

Comment (Economic Factors): Preliminary resource estimates, based on 358 holes drilled by Cyprus are: 138 million tons grading 0.71% copper, 27% magnetite, and 0.001 opt gold in the North Porphyry; 203 million tons grading 0.36% copper, 31% magnetite, and 0.001 opt gold in the South Porphyry; 3 million tons grading 3.35% copper in the Northwest Zone skarn; 7.1 million tons grading 3.35% copper, 23.6% magnetite, and 0.01 opt gold in the East skarn; 2 million tons grading 3.6% copper, 27.9% magnetite, and 0.02 opt gold in the E-2 skarn. The property has not been mined. In 2006, Nevada Copper Corp. (100% owner) reported that Pumpkin Hollow contains measured and indicated Resources totaling 2.7 Billion pounds of copper plus additional Inferred Resources of 3.4 billion pounds of copper (all using a 0.2% copper cutoff grade). This 6 billion pound copper and associated 75 million ton iron resource was estimated in July, 2006.

Comment (Location): 5,240-acre property

Comment (Workings): drilling

Comment (Deposit): Described by some as? western North America's largest undeveloped copper-gold-magnetite iron deposit. ? Mineralization at the Lyon deposit is in six zones: the North and South porphyries, and the Northwest, East, E-2, and Southwest skarns. In the early 1960s, a regional air magnetics survey first identified the large buried copper-iron skarn deposit. Subsequent drilling of the targets identified seven magnetite-salite skarn zones all of which have adjacent and over-printed copper mineralized zones. Metasomatizing hydrothermal fluids emanating from Jurassic age plutons formed exoskarns in surrounding Triassic limestones and limey clastic rocks. First to form were hydrothermal dolomirte and garnet skarnoid rock, subsequently partially replaced by anhydrous salite-magnetite skarn. Iron-depleting skarn formation in the granitic rocks was roughly contemporaneous with the formation of the exoskarn and was probably the source fo the iron to form the magnetite-salite exoskarn. As the period of anhydrous skarn formation waned, hydrous retrograde skarn alteration consisting of calcite, talc, chlorite, amphibole took over, affecting both the exoskarn and endoskarn. Sulfides, including chalcopyrite, were emplaced during this period of hydrous retrograde thermal metamorphism. Later Mesozoic tectonism rotated the mineralized zone about 40 degrees to the west along a N20W horizontal axis. Tertiary tectonism again rotated both the Mesozoic and Tertiary rocks another 70 degrees west in conjuncton with listric faulting. The listric faulting has sliced and separated teh skarn deposit into as many as 5 structural blocks.

Comment (Development): In the early 1960s, a regional air magnetics survey first identified the large buried copper-iron skarn deposit. Subsequent drilling of the targets by Cyprus identified seven magnetite-salite skarn zones all of which have adjacent and over-printed copper mineralized zones. Metasomatizing hydrothermal fluids emanating from Jurassic age plutons formed exoskarns in surrounding Triassic limestones and limey clastic rocks. The property was owned by Conoco in 1982. In 1998, International Taurus Resources acquired the Lyon copper-magnetite property from Cyprus Metals Exploration. A due diligence field program was planned to test gold content of the copper mineralization as well as determine the engineering parameters required for an underground mining operation at the Lyon site. Mineralization at the Lyon deposit is in six zones: the North and South porphyries, and the Northwest, East, E-2, and Southwest skarns. Preliminary resource estimates, based on 358 holes drilled by Cyprus are: 138 million tons grading 0.71% copper, 27% magnetite, and 0.001 opt gold in the North Porphyry; 203 million tons grading 0.36% copper, 31% magnetite, and 0.001 opt gold in the South Porphyry; 3 million tons grading 3.35% copper in the Northwest Zone skarn; 7.1 million tons grading 3.35% copper, 23.6% magnetite, and 0.01 opt gold in the East skarn; 2 million tons grading 3.6% copper, 27.9% magnetite, and 0.02 opt gold in the E-2 skarn. In 2006, Nevada Copper Corp owned the property 100% and reported that Pumpkin Hollow contains measured and indicated Resources totaling 2.7 Billion pounds of Copper plus additional Inferred Resources of 3.4 Billion pounds of Copper (all using a 0.2% copper cutoff grade). This 6 Billion pound copper and associated 75 million ton iron resource was estimated in July, 2006, and the Technical Report is available on the Resource page of this website and at www.sedar.com. Historical work at the Pumpkin Hollow property includes over 590,000 feet of drilling conducted by U.S. Steel Corp., Anaconda Copper Corp. and Cyprus Minerals Corp. among others. These were among the largest mining companies in the world at the time. Numerous resource, metallurgical and economic studies have been completed over the years. The Company intends to move the property forward through feasibility, and is confident that at current metals prices, the Pumpkin Hollow Copper property will soon host Nevada's Next Copper Mine

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References

Reference (Deposit): Denver Mining Record, 6/15/98.

Reference (Deposit): U.S. Bureau of Mines, Files

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

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 (Deposit): Rozelle, John, 2006, Detailed technical report on the Pumpkin Hollow project at http://www.nevadacopper.com/i/pdf/PUMPKINHOLLOWCOPPERPROJECT-NI43-101-063006.pdf
URL: http://www.nevadacopper.com/i/pdf/PUMPKINHOLLOWCOPPERPROJECT-NI43-101-063006.pdf

Reference (General): http://www.nevadacopper.com/s/PumpkinHollow.asp?ReportID=350712&_Type=Pumpkin-Hollow&_Title=Project-History
URL: http://www.nevadacopper.com/s/PumpkinHollow.asp?ReportID=350712&_Type=Pumpkin-Hollow&_Title=Project-History

Reference (General): Tetra Tech (prepared for Nevada Copper Corp.), 2009, Detailed technical report on the Pumpkin Hollow project dated August 20, 2009
URL: http://www.nevadacopper.com/i/pdf/NCC_Pumpkin-TR-Aug09.pdf

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): Steven Kilbreath & others, 1982, Geology of the Pumpkin Hollow Copper-magnettite skarn deposits; abstract for GSN talk given Nov. 19,1982.

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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.