Last Chance Mine [1], Artillery Mountains, Mohave County, Arizona, USAi
| Regional Level Types | |
|---|---|
| Last Chance Mine [1] | Mine |
| Artillery Mountains | Mountain Range |
| Mohave County | County |
| Arizona | State |
| USA | Country |
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Latitude & Longitude (WGS84):
34° 20' 21'' North , 113° 40' 21'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
A former Mn occurrence/mine located in the S½N½N½ sec. 36, T12N, R14W, G&SRM, 9 miles SW of Signal, along Maggie Wash, on state of Arizona land. Owned by the State of Arizona (1958-1973). Operated by R.S. Rodgers, Arizona (1955-1973). Discovered in 1953. Operated 1953-1955. The USGS MRDS database stated accuracy for this locality is 1,000 meters.
Mineralization is narrow mineralized fractures along the north side of a fault, hosted in the Pliocene Sandtrap Conglomerate. The ore body strikes E and dips 60N at ba width of 0.91 meter (3 feet) and a length of 304.8 meters (1,000 feet) and covers an area of 16.2 HA. Ore bodies Nos. 1 & 2 are fissure veins and ore body No. 3 is a shear zone. The primary mode of origin was contact metasomatism. Primary ore control was igneous activity. Wallrock alteration is slight (propylitic & advanced argillic). Mn was mined from small ore shoots along the western end of the fault zone. Two ore shoots produced. The W shoot was 150 feet by 1 to 3 feet, the other, E shoot, was 80 feet by 3.5 feet. Both shoots were intersected by an ore-bearing fracture striking NE. Local rocks include Pliocene to middle Miocene deposits and/or Late to middle Miocene basaltic rocks.
Workings include surface openings with an overall length of 70.1 meters (225 feet).
Production statistics: Year: 1955 (period = 1953-1955), ore (accurate): ^34.4 weight percent Mn.
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
2 valid minerals.
Detailed Mineral List:
| ⓘ Calcite Formula: CaCO3 References: |
| ⓘ Manganite Formula: Mn3+O(OH) References: |
| ⓘ 'Psilomelane' References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Manganite | 4.FD.15 | Mn3+O(OH) |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Unclassified | |||
| ⓘ | 'Psilomelane' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Manganite | Mn3+O(OH) |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Manganite | Mn3+O(OH) |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Mn | Manganese | |
| Mn | ⓘ Manganite | Mn3+O(OH) |
Other Databases
| Link to USGS MRDS: | 10102430 |
|---|
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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