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Oro Blanco area mines (Oro Blanco Mine group), Oro Blanco Mining District (Ruby Mining District), Oro Blanco Mountains, Santa Cruz Co., Arizona, USAi
Regional Level Types
Oro Blanco area mines (Oro Blanco Mine group)Group of Mines
Oro Blanco Mining District (Ruby Mining District)Mining District
Oro Blanco MountainsMountain Range
Santa Cruz Co.County

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Latitude & Longitude (WGS84):
31° North , 110° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
Locality type:
Group of Mines

Ref.: Blake, W.P. (1899).

Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 188-191.

Knight, L.H., Jr. (1970) Structure and mineralization of the Oro Blanco mining district, Santa Cruz County, Arizona: Tucson, University of Arizona, Ph.D. dissertation, 172 p., 7 sheets, scales 1:1,200, 1:6,000, 1:16,000, 1:24,000, 1:60,000, 1:62,500, and 1:358,000.

Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 65 (Table 4).

Equinox Resources Ltd. (1992) 1992 Annual Report: 11.

Randol Mining Directory 1996/97: 141.

Arizona Bureau of Mines file data.

Santa Cruz County Recorder's Records.

MRDS database Dep. ID #10137299, MRDS ID #M050257, MAS ID #0040230073.

A group of former underground Au-Ag-Pb-Cu mines & claim groups located in the SW ¼ sec. 17, SE ¼ sec. 18, NE ¼ sec. 19, & the NW ¼ sec. 20, T.23S., R.11E, on National Forest land. A large group of claims and mines, often overlapping or re-staked, owned and/or worked in whole or in part by various companies, owners or lessors. The major mines of this complex are detailed hereunder. Owned and operated by the Arizona Western Gold Mines Inc. (1976). The Oro Blanco Mining Co.; Fernald; the Legend Group Ltd.; and, Artesia Inc. had unspecified involvement here (1975). Owned and operated by Minefinders Corp. Ltd. (1996).

Mineralization is lensing, tabular zones of brecciated and sheared Cretaceous conglomerate or Tertiary volcanics with finely crystallione quartz cement, minor iron and manganese oxides, wall rock bleaching, and fine-grained gold and silver values. The ratio of silver to gold is about 10:1. Deposits appear limited in verticle and horizontal extent.

Workings are shallow operations from adits, open cuts, and shafts.. Worked sporadically since before the 1900's. Estimated and recorded production would be some 3,000 tons of ore averaging about 0.7 oz. Au/T, 7 oz. Ag/T with minor Cu & Pb. Some high-grade streaks were mined locally. Randol Mining Directory information: Drill-indicated reserves: 500,000 tons @ 0.042, 38,000 tons @ 0.092, 30,000 tons @ 0.78 oz Au/ton.

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Standard Detailed Strunz Dana Chemical Elements

Commodity List

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Mineral List

Mineral list contains entries from the region specified including sub-localities

2 valid minerals.

Detailed Mineral List:

Formula: Au
Formula: KAl2(AlSi3O10)(OH)2
Reference: Wilson, et al (1934)(revised 1967): 190-191.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Wilson, et al (1934)(revised 1967): 190-191.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Group 9 - Silicates
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2

List of minerals arranged by Dana 8th Edition classification

Metals, other than the Platinum Group
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Unclassified Minerals, Mixtures, etc.
var: Sericite-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O MuscoviteKAl2(AlSi3O10)(OH)2
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
Au GoldAu

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USGS MRDS Record:10137299

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