Little Hope and Mary Jane claims, Big Bar Mountain, Butte County, California, USAi

Regional Level Types
Little Hope and Mary Jane claims	Group of Claims
Big Bar Mountain	Mountain
Butte County	County
California	State
USA	Country

A former Cr mine located in sec. 5, T22N, R5E, and in sec. 31, T23N, R6E, MDM (Workings of this deposit are E of the Oroville-Quincy highway, a little N of the bridge over the North Fork Feather River), 2.6 km (8,500 feet) NW of Big Bar Mountain, along the North Fork Feather River. Owned and operated by J. H. Brassell (100%), Pluga, California (1976). MRDS database stated accuracy for this location is 500 meters.

NOTE: Latitude and longitude values provided are for the workings in sec. 5.

Mineralization is a Cr deposit hosted in dunite. The ore body is podiform/lenticular in form (possibly also fissure vein), strikes N80E and dips SE at a width of 4.57 meters. The primary mode of origin was magmatic differentiation and the primary ore control was lithology. Fracturing was the secondary mode of ore control. Wall rock alteration is moderate and involved the serpentinization of dunite. Local rocks include Ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Workings include surface and underground openings with an overall length of 7.62 meters and an overall width of 4.57 meters. They consisted of an open cut, a 15 foot drift in the face of the cut, and a small pit.

Production data are found in: Rynearson, Garn Arthur (1953): 276.

production information: The first cumulative production was from the Little Hope claim; the second was from the Little Hope and Mary Jane claims.

Analytical data results: 36.83% Cr2O3; 12.78% Fe. Cr:Fe ratio 1.97:1.

Other Databases

Link to USGS MRDS:	10028482

Other Regions, Features and Areas containing this locality

References