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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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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.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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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