Lago Deposit

Site Name

Primary: Lago Deposit
Secondary: Bear Copper Deposit
Secondary: Bear prospect
Secondary: Lagomarsino Ranch prospect

---

Commodity

Primary: Molybdenum
Primary: Copper
Secondary: Silver
Secondary: Gold

---

Location

State: Nevada
County: Lyon
District: Mason Valley

---

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

Not available

---

Ownership

Owner Name: Anaconda Minerals Company
Home Office: Nevada
Info Year: 1984

---

Production

Not available

---

Deposit

Record Type: Deposit
Operation Category: Prospect
Deposit Type: Porphyry copper
Operation Type: Underground
Discovery Year: 1961
Years of Production:
Organization:
Significant: Y
Deposit Size: S

---

Physiography

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

---

Mineral Deposit Model

Model Name: Porphyry Cu
Model Name: Porphyry Cu-Mo

---

Orebody

Not available

---

Structure

Type: L
Description: faults

---

Alterations

Not available

---

Rocks

Name: Porphyry
Role: Associated
Description: dikes
Age Type: Associated Rock
Age Young: Tertiary

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

Name: Porphyry
Role: Host
Description: quartz monzonite
Age Type: Host Rock
Age Young: Jurassic

Name: Quartz Monzonite
Role: Host
Description: porphyry
Age Type: Host Rock
Age Young: Jurassic

---

Analytical Data

Not available

---

Materials

Ore: Chalcopyrite
Ore: Bornite
Ore: Molybdenite
Gangue: Pyrite

---

Comments

Comment (Development): In 1965, a Newmont-Utah Construction jpont venture drilled shallow holes in the Lagomarsino Ranch lands area northeast of the main Yerington Deposit on the east side of McLeod Hill, but found insufficient copper mineralization to continue work. Anaconda subsequently acquired the property and drilled 10 deeper holes with similar results. Phelps Dodge drilled 12 holes on the property between 1969 and 1973 and discovered the copper-moly deposit. Development of the deposit would have necessitated relocation of the county airport, which was voted down by the Lyon COunty Board of Commissioners, effectively halting development of this rich orebody.

Comment (Commodity): Ore Materials: chalcopyrite, bornite, molybdenite

Comment (Commodity): Gangue Materials: pyrite

Comment (Deposit): Replacement and disseminated mineralization is hosted mainly by granodiorite and quartz monzonite deposit but is associated with faulting at an igneous contact zone.

Comment (Economic Factors): The deposit contains an estimated 484,000,000 tons of material grading 0.44% copper and 0.01 % Mo, based on a 1979 resource estimate.

Comment (Geology): The deposit does not outcrop and is deeply buried.

Comment (Identification): All pertinent material from earlier MRDS record N000424 has been incorporated into the current record, as well as additional new information.

Comment (Location): The Bear deposit is concealed beneath Cenozoic cover just NW of Mcleod Hill.

Comment (Deposit): Associated Minerals: actinolite, biotite, chalcopyrite, magnetite, molybdenite, pyrite

Comment (Deposit): Associated Rock: quartz monzonite;granite, limestone, rhyolite, sandstone, skarn, volcaniclastic rocks ;andesite, quartz monzodiorite

Comment (Deposit): Deposit Does Not Outcrop And Is Deeply Buried. General Size Of Ore Body: Large

---

References

Reference (Deposit): Lowe, Raney, and Norberg, Principal Deposits of Strategic and Critical Minerals in Nevada; USBM IC-9035.

Reference (Deposit): Proffett, J.M., 1967, Progress Report on the Bear-Lagomarsino area, Yerington District, Lyon County, Nevada: Anaconda Company Report, 31p..

Reference (Deposit): Wilson, G.E., 1978, Data exchange with Phelps Dodge on the Bear-Lagomarsino area: Anaconda Company Report, 28p.

Reference (Deposit): John, D.A., and Sherlock, M.G., 1991, Map Showing Mines and Prospects in the Reno 1 by 2 Quadrangle, Nevada and California, USGS MF-2154, Site #P3

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

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): 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 (Reserve-Resource): World Mining (San Francisco) Anaconda - Atlantic Richfield Must Divest Cu Reserves. V. 32. No. 5, 1979, P. 65.

Reference (Deposit): Dilles, J.H. and Wright, J.E., 1988, The chronology of Early Mesozoic arc magmatism in the Yerington District, Nevada, and its regional implications; Geological Society of America Bulletin, v. 100, p. 644-652.

Reference (Deposit): Einaudi, M.T., 1982, Description of skarns associated with porphyry copper plutons; in Titley, S. R., ed., Advances in Geology of the Porphyry Copper Deposits, Southwest North America, University of Arizona Press, Tucson, Arizona, p. 139-183.

Reference (Deposit): Albino, G.V., 1995, Porphyry copper deposits of the Great Basin?Nevada, Utah, and adjacent California, in Pierce, F.W., and Bolm, J.G., eds, Porphyry copper deposits of the American Cordillera: Tucson, Arizona Geological Society Digest 20, p. 267?296.

Reference (Deposit): Dilles, J.H., and Proffett, J.M., 1995, Metallogenesis of the Yerington batholith, Nevada, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Tucson, Arizona Geological Society Digest 20, p. 306?315.

---

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.