Alamo gold placer (Oro Blanco placers; Alamo Mine), Alamo Gulch, Ruby, Oro Blanco Mining District (Ruby Mining District), Oro Blanco Mountains, Santa Cruz County, Arizona, USAi
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Latitude & Longitude (WGS84):
31° 26' 9'' North , 111° 19' 0'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Arivaca | 695 (2011) | 15.5km |
| Aduana del Sásabe | 1,295 (2018) | 22.1km |
| Tumacacori-Carmen | 393 (2015) | 30.1km |
| Tubac | 1,191 (2011) | 32.3km |
| Rio Rico | 18,962 (2011) | 32.5km |
Mindat Locality ID:
34018
Long-form identifier:
mindat:1:2:34018:7
GUID (UUID V4):
0b524385-22b4-4d4c-b1bd-2b3d7ba22e17
‡Ref.: Blake (1899).
Wilson, E.D. (1927) Arizona gold placers (Second edition, Revised): Arizona Bureau of Mines Bulletin no. 124, 60 p.: 54-55.
Arizona Bureau of Mines Bull. 135 (1933), Arizona Gold Placers & Placering: 76-77.
Butler, G.M. (1937) Arizona Gold Placers and Placering. Arizona Bureau of Mines Bull. 142: 76.
Wilson, E.D. (1961) Gold Placers and Placering in Arizona. Arizona Bureau of Mines Bull. 168 (revised 1978): 82-83.
Johnson, M.G. (1972), Placer gold deposits of Arizona, USGS Bull. 1355: 46-47.
Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 62 (Table 4).
U.S. Bureau of Mines field notes Aug 26.
Arizona Department of Mineral Resources Alamo Mine file.
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10113387, MAS ID #0040230028.
A Au-Ag placer deposit and former mine area located in the SE ¼ sec. 9 & the SW¼SW¼ sec. 10, T.23S., R.10E, SSW of Ruby, on National Forest land. Seitz and Bider and Villa et al had unspecified involvement here (1976).
Mineralization is fine to coarse gold particles containing about 1:5 alloyed silver found in gravels of Alamo and neighboring gulches, derived from the weathering of numerous small gold-silver-bearing veins and blanket-like deposits of the Oro Blanco Mts. This gold is much lighter in color due to the high alloyed silver values, thus the Spaniards termed it 'Oro Blanco', which means 'white gold." This is the material that gave this mountain range and the district their names.
Workings are mostly crude operations prior to 1900. Estimated production would be several hundred ounces of gold-silver amalgam.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Gold Formula: Au Colour: Whitish gold Description: Exceptionally large % Ag - approx. 1:5 Ag:Au alloy. References: |
| ⓘ Gold var. Electrum Formula: (Au,Ag) Colour: Whitish gold Description: Exceptionally large % Ag - approx. 1:5 Ag:Au alloy. References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold var. Electrum | 1.AA.05 | (Au,Ag) |
| ⓘ | 1.AA.05 | Au | |
List of minerals for each chemical element
| Ag | Silver | |
|---|---|---|
| Ag | ⓘ Gold var. Electrum | (Au,Ag) |
| Au | Gold | |
| Au | ⓘ Gold var. Electrum | (Au,Ag) |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS MRDS: | 10113387 |
|---|
Other Regions, Features and Areas containing this locality
Mexico
- Sierra Madre OccidentalMountain Range
North America
- Sonoran DesertDesert
North America PlateTectonic Plate
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