Chicago Mine, Mammoth-Chicago-Copper Glance Mine group, Midway Mining District, Buckskin Mountains, La Paz County, Arizona, USAi
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Latitude & Longitude (WGS84):
34° 3' 11'' North , 113° 47' 2'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Other/historical names associated with this locality:
Chicago prospect; Chicago property; Corona Copper Co. property
A former underground Cu-Au-Ag-Baryte-Fe-Fluorspar mine located in the center of E sec. 13, T8N, R15W, 20 air miles NW of Wenden, on BLM-administered land. Location in ABGMT Bull. 192 is too far east. Owned and operated by the Corona Copper Co. of Arizona.
Mineralization is a vein deposit with spotty (vugs and irregular masses), oxidized copper minerals with strong hematite and quartz and local barite, minor fluorite, and traces of sulfides in irregular fault veins or replacement deposits in Precambrian gneiss and schist and granitic breccia, cut by pegmatite, aplite and amphibolite dikes. The ore zone is 0.1 meters wide, strikes S35E, and dips 80NE. Mineralization associated with low-angle detachment faulting. Orebodies are within and immediately above the micro-brecciated detachment surface; irregular hydrothermal replacement. Some epidote and chlorite. It occupies a slightly mineralized fault plane of no great magnitude in the gneiss.
Workings are shafts sunk in the 1890's into the early 1900's, during prospecting, and amount to 121.92 meters in length and 38.1 meters deep. A small amount of ore was produced averaging about 16% Cu, 0.8 oz. Au/T, and 1.3 oz. Ag/T in 1907.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
6 valid minerals.
Detailed Mineral List:
| ⓘ Baryte Formula: BaSO4 |
| ⓘ 'Chlorite Group' |
| ⓘ Chrysocolla Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| ⓘ Dioptase Formula: CuSiO3 · H2O Description: Occurs in small quantities. |
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ Fluorite Formula: CaF2 |
| ⓘ Hematite Formula: Fe2O3 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 3 - Halides | |||
|---|---|---|---|
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ | Dioptase | 9.CJ.30 | CuSiO3 · H2O |
| ⓘ | Chrysocolla | 9.ED.20 | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Unclassified | |||
| ⓘ | 'Chlorite Group' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| H | ⓘ Dioptase | CuSiO3 · H2O |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | Oxygen | |
| O | ⓘ Baryte | BaSO4 |
| O | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| O | ⓘ Dioptase | CuSiO3 · H2O |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Hematite | Fe2O3 |
| F | Fluorine | |
| F | ⓘ Fluorite | CaF2 |
| Al | Aluminium | |
| Al | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Si | ⓘ Dioptase | CuSiO3 · H2O |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| S | Sulfur | |
| S | ⓘ Baryte | BaSO4 |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Ca | ⓘ Fluorite | CaF2 |
| Fe | Iron | |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Hematite | Fe2O3 |
| Cu | Copper | |
| Cu | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Cu | ⓘ Dioptase | CuSiO3 · H2O |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
Other Databases
| Link to USGS MRDS: | 10027051 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mojave DomainDomain
- Southern Basin and RangeWide Rift
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References
Bancroft, H. (1911) Reconnaissance of the ore deposits in northern Yuma County, Arizona. Bulletin 451. US Geological Survey doi:10.3133/b451
