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Baltimore Mine, Madera Peak (Jackass Mountain), Madera Co., California, USA

Latitude: 37°30'51"N
Longitude: 119°23'32"W
A former lode Au mine located in the W½NW¼ sec. 7, T5S, R24E, MDM (highly uncertain), 3.0 km (9,800 feet) SSW of Madera Peak (coordinates of record), on National Forest wilderness land (Ansel Adams Wilderness). MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is a vein deposit with a 2 foot thick vein bearing a 6 to 18 inch pay streak. The ore body dips 70NW. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges) and/or Quaternary glacial deposits.

Workings include underground openings comprised of a 400 foot adit and a 28 foot deep winze plus a 60 foot ventilation shaft.

Mineral List


2 entries listed. 2 valid minerals.

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Crawford, James John (1894), Twelfth report of the State Mineralogist: California Mining Bureau. (Report 12): 12: 154.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10035059 & 10115197.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060390281.

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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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