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Gifford Mine (Le Grange ?), Weaverville, Weaverville District, Klamath Mts, Trinity Co., California, USA

Latitude: 40°44'25"N
Longitude: 122°58'39"W
A former lode and placer [?] Au-As-Pb mine located in sec. 3, T33N, R10W, MDM, 3.3 km (2.0 miles) WNW of Weaverville, N of Grub Gulch and W of West Weaver Creek (on the slope of ridge S of Eastman Gulch [?][this bit of datum apparently pertains to the Gifford Placer Mine, which see for further details]), on National Forest land. MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is hosted in granite. The ore body strikes N40E and dips 45-70SE at a thickness of 0.61 meters. The veins occur in close proximity to a contact between granite and meta-andesite. The contact strikes N-S, and dips 60E. A fault cut by the adit strikes E-W and dips 75S. The vein is faulted 29 feet to the S. Local rocks include schist of various types and ages, unit 7 (Klamath Mountains) and/or Paleozoic metavolcanic rocks, unit 1 (Eastern Klamath Mountains).

Workings include underground openings. 4 crosscut adits exist at different elevations. The Rickards and Lindermuth tunnel was driven S19W for 700 feet at 180 feet from the portal. It cut a meta-andesite/granite contact. At 680 feet, it cut an E-W fault. A drift 40 feet W on the fault where it cut a N-trending vein. 600 feet from the portal, the tunnel cut a N-S-trending fault. An upraise, 30 feet above the drift, cuts another vein. Above the Richards tunnel, 115 feet, is the Lane tunnel, driven S for 400 feet, then SE 280 feet. 560 feet from the portal of the tunnel, it cuts a meta-andesite/granite contact. A drift 80 feet to the SW cuts an E-W fault. A raise on the fault cut a vein, 5 feet thick. The Wilson-Ehrman tunnel, 155 feet above the Lane tunnel was driven for 460 feet.

Production data are found in: Tucker (1922).

production information

No other production record was found.

Analytical data results: The N-trending vein cut by a fault reportedly assayed $250/ton in Au (period values). Its thickness was 16 inches. Assays of a vein 1 to 2 feet thick, where cut by an upraise, averaged $20/ton in Au (period values). The assay value of shipments made from the property from January, 1907 to October, 1920, ran from 10 to 20 ounces of Au.

Mineral List

Galena
Gold
Quartz


3 entries listed. 3 valid minerals.

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References

Tucker, W. Burling (1922), Redding Field Division, California Journal of Mines and Geology, California Mining Bureau (Report 18): 18: 497.

O’Brien, J.C. (1965) Mines and mineral resources of Trinity County, California. Caifornia Division of Mines and Geology County Report 4: 125 pp.: 69.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10035899 & 10165682.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061050981.

U.S. Bureau of Mines, Western Field Operations Center (WFOC), Minerals Information Listing Service (MILS), (MILS-WFOC) production files.

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