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Mine Descriptions

Old Baldy Mining District

This district is in both Santa Cruz and Pima counties.

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Old Baldy image not found
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[Ref. 2]

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Old Baldy image not found

Mine/PlacerMRDS41914 mapSchrader2 Pima6 Santa Cruz5
Carrie Nation Mine  x x   14
Central   x   5  
Copper King   x   3  
Copper Queen mine
   x x   11
Florida Canyon Mine   x x 4  
Helen Gould prospect     x    
Iron Cliff prospect   x x   15
Iron Mask prospect   x x 2  
Jackson mine   x x 1  
Lead prospect   x x   12
Lucky Ledge mine   x x   10
Midst  x   6  
Molybdenite prospects  x x 7  
Old Baldy prospect   x x   9
Placer deposits     x    
Sawmill prospect     x    
Spear prospect   x x   13
Star Pointer mine  x x   17
Tucson Prospect   x x   8
Unnamed Prospect 1          
Velvet mine   x x   16

Location

Santa Cruz: 20S, 14E5

Pima: 19S, 14 - 15E6

Mineral Products

Pima: Cu, Pb, Zn, Au, Ag6

Santa Cruz: Cu-, Pb-, Zn-, Au-, Ag-, Mo-5

Geology

Pima: 1. Scattered, small and relatively weak, partially oxidised, copper and local Molybdenite mineralization in quartz fissure zones in Mesozoic volcanics and Laramide intrusions.

2. Gold placer deposits in alluvial cone in Madera Canyon6.

Santa Cruz: Spotty and weak, partially oxidized, base metal sulfides with associated minor gold and silver values, with or without quartz, along shear zones in Laramide intrusives or metamorphized volcanics.5

Types of operation and production

Pima: Scattered, small, and generally shallow prospects and mines worked intermittently since the 1880s. Total estimated and reported production not more than a few hundred tons of sorted high grade copper ore. Considerable placer gold recovered in the late 1880s6.

Santa Cruz: Scattered, small, and generally shallow operations. Mostly prospects with no recorded production5.

References

  1. Mineral Appraisal of Coronado National Forest, Part 12, Santa Rita Mountains Unit, MLA11-94 (1994). SR 591-609
    http://repository.azgs.az.gov/sites/default/files/dlio/files/nid1813/usbm_mla_011-94.pdf
  2. Mining in the Santa Rita and Patagonia Mountains of Arizona, U.S. Department of Interior, 1915. Republished 2014 by Kerby Jackson.
  3. Mike Bertram,
  4. USGS Mineral Resources Data System - using WGS84 (https://mrdata.usgs.gov/mrds/map-commodity.html#home)
  5. Index of Mining Properties in Santa Cruz County by Staton B. Keith, bulletin 191, Arizona Geological Survey, 1975
  6. Index of Mining Properties in Pima County by Staton B. Keith, bulletin 189, Arizona Geological Survey, 1974