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Baxter Winthrop Mine (Winthrope Mine; Baxter Mine; Copper City Mine; Excelsior claim; Brown claim; Humboldt claim; Baxter claim), Bully Hill, Bully Hill, Bully Hill District (Winthrop District), East Shasta Copper - Zinc District, Klamath Mts, Shasta Co., California, USA
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Latitude: 40°47'1"N
Longitude: 122°13'7"W
A former Cu-Au-Ag mine located in sec. 21 & 28, T34N, R3W, MDM, 2.0 km (6,600 feet) SSW of Bully Hill (summit) and 0.3 km (800 feet) SSW of Killanger Peak (coordinates of record), on National Forest land. Property consists of 4 claims. MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is hosted in the Elkhorn Ridge Argillite (rhyolite). The ore body is lenticular and strikes NW with a vertical dip at 3.66 meters thick. Ore control was a series of vertical shear zones in the Buddy Hill Rhyolite. Shear zones cut the E limb of an anticline in the Buddy Hill Rhyolite. Much of the country rock is strongly silicified. Local rocks include Mesozoic volcanic rocks, unit 5 (Northern Sierra Nevada and Eastern Klamath Mountains).

Local structures include a shear zone striking N20E.

Related tectonic structures include an island arc.

Workings include underground openings with an overall depth of 51.82 meters and a length of 304.8 meters. Principal work consisted of drifting at 3 levels (815, 936 and 1,060 feet in altitude along the Copper City shear zone). The Winthrop adit was stoped to surface.

Production was 119 tons of sulphide ore in 1926-1927.

Assay analyses results: ^8% Cu, $40/ton Au $20/ton Ag (1863).

Mineral List


7 entries listed. 7 valid minerals.

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Aubury, Lewis E. (1902), The copper resources of California: California Mining Bureau Bulletin 23: 65.

Aubury, Lewis E. (1902), Register of Mines and Minerals No. 10-12, California Mining Bureau: 8.

Boyle, A.C. Jr. (1914), The geology and ore deposits of the Bully Hill mining district, California: A.I.M.E. Bulletin 85: 57-105; A.I.M.E. Transactions: 48: 67-117 (1915): 98.

A.I.M.E. Transactions (1915): 48: 67-117, 98.

Laizure, Clyde McK (1921), Redding field division: California Mining Bureau. Report 17: 528.

Tucker, W. Burling (1924b), Copper resources of Shasta County: California Mining Bureau. Report 20: 427, 445.

Logan, Clarence August (1926), El Dorado, Shasta and Trinity Counties: California Mining Bureau. Report 22: 146.

Averill, Charles V. (1939), Mineral resources of Shasta County: California Division of Mines Report 35: 127.

Albers, John P. & Jacques F. Robertson (1961), Geology and ore deposits of East Shasta copper-zinc district, Shasta County, California, USGS PP 338: 100.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 130, 159.

Lydon, Philip Andrew and O’Brien, J.C. (1974) Mines and mineral resources of Shasta County, California. California Division of Mines and Geology County Report 6, 154 pp.: 104.

USGS crib list (1981) (November 4, 1981).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033802 & 10165018.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060890607.

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