O'Leary Prospect

The O'Leary Prospect is a manganese mine located in Humboldt county, Nevada at an elevation of 5,499 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: O'Leary Prospect

Commodity

Primary: Manganese

Location

State: Nevada
County: Humboldt
District: Black Diablo District

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: Frank O'Leary
Years: 1959 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Deposit Type: Replacement
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

Not available

Mineral Deposit Model

Model Name: Volcanogenic Mn

Orebody

Form: LENTICULAR

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Analytical Data: REPRESENTATIVE HEAD SAMPLE ASSAYED 22.9 % MN, 2.1 % FE, 55.8 % SI02, 63.4 % INSOL., 0.039 % P, 1.9 % AL203, NO ZN, 1.06 % BA, 0.1 % CAO.

Materials

Ore: Psilomelane
Ore: Pyrolusite

Comments

Comment (Commodity): ORE CONSISTS OF VERY FINE GRAINS OF BRAUNITE, PYROLUSITE AND PSILOMELANE UNIFORMLY DISTRIBUTED THROUGHOUT A QUARTZITE GANGUE. IN PLACES MN OXIDES HAVE PARTLY REPLACED THE QUARTZITE SO THAT THE INDIVIDUAL QUARTZ GRAINS APPEAR SMOKEY. INTIMATE ASSOCIATION OF MN OXIDES WITH SILICEOUS GANGUE GREATLY INHIBITED BENEFICIATION OF ORE.

Comment (Development): OWING TO LACK OF EXPLORATION (AS OF 1959) EXTENT OF MINERALIZATIONWAS UNKNOWN

Comment (Deposit): BRAUNITE AND MN OXIDES INTIMATELY INTERGROWN WITH CHERT AND JASPER. DEPOSIT IS A REPLACEMENT OF SEDIMENTARY ROCKS. FOOTWALL IS SLATE; HANGING WALL IS SILICEOUS WITH LENSES OF JASPER AS MUCH AS 10 FT THICK. INTERBEDDED WITH THE MN OXIDES ARE THIN BEDS OF SILICIFIED SHALE AND LENSES OF JASPER RICH IN HEMATITE.

Comment (Location): 0.75 MILE NORTH OF BLACK DIABLO MINE . INFO FROM LAND.ST :(1972)

References

Reference (Deposit): USBM, 1959, RI 5446, P. 20-21.

Reference (Deposit): USBM, 1983, MILS DATA

Reference (Deposit): USBM, 1951, R.I. 4754, P. 14-15

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.