Portland Mine, Pilgrim Mining District, Mohave County, Arizona, USAi
| Regional Level Types | |
|---|---|
| Portland Mine | Mine |
| Pilgrim Mining District | Mining District |
| Mohave County | County |
| Arizona | State |
| USA | Country |
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Latitude & Longitude (WGS84):
35° 22' 50'' North , 114° 30' 44'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Katherine | 103 (2011) | 18.2km |
| Laughlin | 7,323 (2011) | 24.3km |
| Bullhead City | 39,445 (2017) | 26.4km |
| Chloride | 271 (2011) | 28.6km |
| Golden Valley | 8,370 (2011) | 31.5km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Silvery Colorado River Rock Club | Bullhead City, Arizona | 26km |
| Mohave County Gemstoners | Kingman, Arizona | 47km |
‡Ref.: Conrad, J.E., et al (1990), Mineral Resources of the Black Mountains North and Burns Spring Wilderness Study Areas, Mohave County, Arizona, USGS Bull. 1737-C: C2; AZ Dept. Min. Resources - Portland Mine files; US Bur. Mines file data cluster NO 1439 - Portland Mine; USGS Info. Circ. 6901 (1936): 48; Gardner, E.D. (1936), Gold mining and milling in the Black Mountains, western Mohave County, Arizona, US Bur. Mines Info. Circ. 6901: 48; Niemuth, N.J. (1987), Arizona Mineral Development 1984-1986, AZ Dept. Mines & Min. Resources Directory 29; AZ Dept. Min. Resources (ADMR) Portland Mine file; Bur. Land Mgmt. Arizona Mining claim file No. 28157; MRDS files #10088844 & 10283253.
An open pit gold mine located between the Black Mountains North and Burns Spring Wilderness Study areas on the west side of the Black Mountains. Probably discovered in the early 1930's as an underground and surface mine. Mining operations began in 1935 or early 1936. Probably closed in the early 1940's. Reopened by the Western States Minerals Corp. in March, 1985. Produced between 1985 and 1989.
Mineralization is a 5 to 20 foot thick, north-trending, brecciated quartz and calcite vein, striking approximately north and dipping 20º to 30º east and in 10 to 150 feet of stockwork in the footwall. Undated quartz diorite and basalt dikes are exposed in the footwall, and Tertiary andesite and latite make up the hanging wall. Altered rhyolite, which crops out in both wilderness study areas, NE of the mine, has anomalous surface and sub-surface gold concentrations.
Workings are an open pit mine. Approximately 1,000,000 tons of ore was removed in the most recent mining period.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Laumontite Formula: CaAl2Si4O12 · 4H2O References: Luetcke, Rolf (n.d.) Personal communication.Identified by Rolf Luetcke: Visual Identification |
| ⓘ Native Gold Formula: Au |
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 9 - Silicates | |||
| ⓘ | Laumontite | 9.GB.10 | CaAl2Si4O12 · 4H2O |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| Al | Aluminium | |
| Al | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| Si | Silicon | |
| Si | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Laumontite | CaAl2Si4O12 · 4H2O |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
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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Portland Mine, Pilgrim Mining District, Mohave County, Arizona, USA