‡Ref.: Tenny, J.B. (1927-1929) History of Mining in Arizona, Special Cllection, University of Arizona Library & Arizona Bureau of Mines Library: 340.
Tenney, J.B. (1934) Economic Geological Reconnaissance of Casa Grande Mining District. Arizona Bureau of Mines: 23-24.
US Atomic Energy Commission Preliminary Reconnaissance Report 172-488 (1953): 12.
Dunning, Charles H. (1966) Silver: 121-122.
Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Min. Report 4.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 300;
Rocks & Minerals: 63: 327; Rocks and Minerals: 64: 58.
U.S. Bureau of Mines Mining District Sheet 561.
Arizona Department of Mineral Resources U file.
Arizona Department of Mineral Resources file data.
USGS Silver Reef Mountains Quadrangle map.
MRDS database Dep. ID #10046277, MRDS ID #M241169; and Dep. D #10159000, MAS ID #0040210765.
A former underground Pb-Ag-Cu-Au-Mo-silica mine. Discovered 1885, produced 1905-1955. Also known as / designated: Unpatented claims MS 3369; Santiago MS 3369 unpatented claim; Lead Boulder MS 3369 unpatented claim; Hornsilver claims MS 3369 unpatented claim; Cholla MS 3369 unpatented claim; Arizona Mercantile Transport and Smelting Co. claim.
Mineralization is secondary enrichment by ground water percolation down a fault zone. Ore control was E-W fractures, minor NW-striking faults. The main E-W vein dips 75° - 77° S. Associated rock unit is the Oracle Granite (of Peterson) and vesicular andesite.
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Map Reference: 32°42'43"N , 111°49'3"W
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