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Portland Mine, Lost Cabin Wash, Pilgrim Mining District, Mohave County, Arizona, USAi
Regional Level Types
Portland MineMine
Lost Cabin WashWash
Pilgrim Mining DistrictMining District
Mohave CountyCounty

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Latitude & Longitude (WGS84):
35° 22' 50'' North , 114° 30' 44'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
Katherine103 (2011)18.2km
Laughlin7,323 (2011)24.3km
Bullhead City39,445 (2017)26.4km
Chloride271 (2011)28.6km
Golden Valley8,370 (2011)31.5km

‡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 Strunz Dana Chemical Elements

Mineral List

2 valid minerals.

Detailed Mineral List:

Formula: CaCO3
Reference: 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.
Formula: Au
Reference: 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.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Group 5 - Nitrates and Carbonates

List of minerals arranged by Dana 8th Edition classification

Metals, other than the Platinum Group

List of minerals for each chemical element

C CalciteCaCO3
O CalciteCaCO3
Ca CalciteCaCO3
Au GoldAu

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

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