Cobalt Mine (Cobalt shaft; Cobalt prospect; Walker prospect [?]), Grapevine Gulch, Black Hills District, Black Hills (Black Hill Range), Yavapai Co., Arizona, USA

• Display
  • Standard
  • Detailed
  • By Strunz Category
  • By Dana Category
• Photos
  • Add Photo
• Maps
  • Map Pages
  • Nearest Localities
• Search
  • Mineral Search
  • Search Google

‡Ref.: Lindgren, W. (1926), Ore deposits of the Jerome and Bradshaw Mountains quadrangles, Arizona, USGS Bull. 782: 100.

US Atomic Energy Commission Preliminary Reconnaissance Report Yavapai County (1953): 91.

Anderson, C.A. & S.C. Creasey (1958), Geology and ore deposits of the Jerome area, Yavapai County, Arizona, USGS PP 308: 177.

Arizona Department of Mineral Resources Cobalt Mine file.

MRDS database Dep. ID #10027255, MRDS ID #M002642; and Dep. ID #10067568, MRDS ID #W000353; and, Dep. ID #10210718, MAS ID #0040250511.

A Co-Cu-As-Fe-Silica occurrence/prospect located about ½ mile SE from the Shylock Mine in a tributary of Grapevine Gulch.

Mineralization is a vein deposit with pinch and swell orebody(ies) that occur in greenstone with aplite dikes. The country rock is a small patch of gabbro separating the granodiorite to the south from Grapevine Gulch formation to the north.

A small vein exposed by the winze strikes N.30ºE. and dipping 60º-70ºW. The vein ranges in width from a knife-edge to 14 inches, and is about 15 feet long. It pinches out before reaching the face of the adit, and is not exposed on the SW side of the winze. The vein material is partly oxidized, altered gabbro containing relics of sulfide, possibly cobaltiferous arsenopyrite. The vein in the adit is covered with erythrite.

Workings include a 28 foot long opencut leading to an 18 foot long adit. A 20 foot winze was sunk at the portal.

Mineral List

'Cobaltoan Arsenopyrite'

Erythrite

2 entries listed. 1 valid mineral.