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Surcease Mine (Bunker Hill Mine; Treasure Hill Mine), Big Bend, Butte Co., California, USA

Latitude: 39°41'23"N
Longitude: 121°27'58"W
A former lode Cu-Pb-Au-Ag-Zn-Sb mine located in secs. 4, 5, 6 & 7, T21N, R4E and sec. 25, T21N, R5E, MDM, 1.1 km (3,500 feet) SSW of Big Bend (hamlet) and 5.0 km (3.1 miles) ESE of Yankee Hill and about 3 miles NE of Las Plumas, on National Forest land. Owned by the Hoefling Brothers, Sacramento, California. MRDS database stated accuracy for this location is 500 meters.

Mineralization is a Cu-Pb-Au deposit hosted in schist. The ore body is ribbon-shaped, strikes NW and dips 20-40NE & 55-70NE, at a thickness of 6.1 meters. Controls for ore emplacement included a fault zone that strikes N70E and dips 65-70N. An associated rock is granite. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).

Local geologic structures include a trondjemite intrusion, that is exposed 2 Miles to the SE.

Workings include underground openings comprised of an incline of 24 degrees to a depth of 450 feet. It then steepens to 40 degrees, for a total depth of 610 feet. The principal adit is on the 210 foot level, entering from Shields Gulch near the mill, and running NW on the vein 1,000 or more feet, crossing the shaft and extending to North fault. The level above it runs 420 feet SE and 560 feet NW. Below the adit, a level runs both ways with raises to prospect the downwards extension of the ore shoots. The 600 foot level was also run 450 feet SE and 600 feet NW without finding and ore body. A millsite is present. More detailed descriptions are found in O'Brien.

Production data are found in: Logan (1930); O'Brien (1949); and in Goodwin (1957).

Production information: About 27,000 tons of ore were treated in the mill. No specific dates are available. Operated in 1914-1916 and reported to have produced $17,000 (period values) from ore that yielded $7 a ton in free gold (period values). Total production has been over $200,000 (period values) to date. The larger part of ore mined averaged $9 a ton (period values). Large Au-Ag production occurred during the period 1924-1943.

A few thousand tons of ore remained in sight in May, 1928.

Analytical data results: Assayed 0.2 top 0.06 ounces Au/ton.

Operating cost for mining, milling, treatment and marketing bullion was $5.03/ton (period values).

Mineral List

Antimony
Bornite
Bournonite
Chalcopyrite
Covellite
Galena
Gold
Limonite
Marcasite
Pyrrhotite
Quartz


11 entries listed. 10 valid minerals.

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References

Logan, Clarence August (1930), Mines and Mineral Resources of Butte County, California: California Journal of Mines and Geology, California Mining Bureau (Report 26): 26(4): 381-382.

O’Brien, J.C. (1949), Mines and mineral resources of Butte County, California: California Journal of Mines and Geology: 45: 421, 430-432, 452.

Goodwin, Joseph Grant (1957) Lead and zinc in California. California Journal of Mines and Geology, Division of Mines (Report 53): 53(3&4): 421-424.

McCulloch, W.C., Oesterling, W.A., Spurck, W.H., & Tischler, M.S. (1964), Minerals for Industry, Northern California, Southern Pacific Company: Vol. II: 54-55.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 77, 112.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 50, 68, 73, 87, 93, 99, 101, 136.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10028560, 10035946 & 10260398.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060070178.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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