Expansion group, Union Pass Mining District (Katherine Mining District), Oatman Mining District, Black Mountains, Mohave County, Arizona, USAi
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
35° 13' 1'' North , 114° 24' 19'' West
Latitude & Longitude (decimal):
Type:
Group of Claims
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Katherine | 103 (2011) | 14.2km |
| Laughlin | 7,323 (2011) | 16.2km |
| Golden Valley | 8,370 (2011) | 16.6km |
| Bullhead City | 39,445 (2017) | 16.7km |
| Oatman | 135 (2011) | 21.3km |
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 | 17km |
| Mohave County Gemstoners | Kingman, Arizona | 32km |
A former Ag-Au occurrence/prospect/claims located in the SE¼NE¼SW¼ sec. 10, T21N, R20W, G&SRM, on Bureau of Land Management administered land. Owned by the Expansion Gold Mining Company, Arizona (1909). The USGS MRDS database stated accuracy for this locality is 10 meters.
The Expansion group is situated about a mile southwest of Union Pass, at an elevation of 3,200 to 3,600 feet. It is owned by the Expansion Gold Mining Company, of Kingman, which acquired the property in October, 1905, and has operated it since April, 1906.
The property comprises six or more claims, situated along the contact zone. It is crossed near its middle point by a prominent gulch that heads near the pass and affords good exposures of the relations of the intrusive rocks to the pre-Cambrian granite. The portion to the southeast of the gulch lies along a contact scarp. That to. the northwest is located on a prominent hogback. The camp is located on this gulch just above the hogback, and is amply supplied with good well water confined by an andesite dike intruded into the rhyolite. The developments at the time of visit were a 220-foot tunnel near the crest of the hogback and a crosscut. Since then, however, it is reported that much work has been done and a 60-ton mill has been
installed.
There are two lodes on the property. The more westerly is on the contact of the rhyolite porphyry and the pre-Cambrian gneissoid granite. Its silicified zone is about 200 feet wide and is traceable for a considerable distance in a northwesterly direction. It contains bands or belts of ore of varying width. The samples from the surface are stated to have given assays ranging from a few cents up to $90 a ton in gold, and contain also a little silver. The eastern lode is on the contact of andesite and rhyolite. Its surface values range up to $11 a ton, and the mineralization extends laterally a considerable distance into the rhyolite.
In the southeastern part of the property, which was being developed by a tunnel at 100 feet below-the croppings of the rhyolite-granite contact on the granite side of the contact, moderate values were reported in the granite. In the older orange-colored altered rhyolite that floors the valley just north of the camp fair gold values are said to occur over an area of 10 acres or more. This rhyolite is in part silicified and vuggy. All the Expansion ore is cyaniding ore.
The property comprises six or more claims, situated along the contact zone. It is crossed near its middle point by a prominent gulch that heads near the pass and affords good exposures of the relations of the intrusive rocks to the pre-Cambrian granite. The portion to the southeast of the gulch lies along a contact scarp. That to. the northwest is located on a prominent hogback. The camp is located on this gulch just above the hogback, and is amply supplied with good well water confined by an andesite dike intruded into the rhyolite. The developments at the time of visit were a 220-foot tunnel near the crest of the hogback and a crosscut. Since then, however, it is reported that much work has been done and a 60-ton mill has been
installed.
There are two lodes on the property. The more westerly is on the contact of the rhyolite porphyry and the pre-Cambrian gneissoid granite. Its silicified zone is about 200 feet wide and is traceable for a considerable distance in a northwesterly direction. It contains bands or belts of ore of varying width. The samples from the surface are stated to have given assays ranging from a few cents up to $90 a ton in gold, and contain also a little silver. The eastern lode is on the contact of andesite and rhyolite. Its surface values range up to $11 a ton, and the mineralization extends laterally a considerable distance into the rhyolite.
In the southeastern part of the property, which was being developed by a tunnel at 100 feet below-the croppings of the rhyolite-granite contact on the granite side of the contact, moderate values were reported in the granite. In the older orange-colored altered rhyolite that floors the valley just north of the camp fair gold values are said to occur over an area of 10 acres or more. This rhyolite is in part silicified and vuggy. All the Expansion ore is cyaniding ore.
Local rocks include Middle Miocene to Oligocene volcanic rocks.
Workings include underground openings.
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramList of minerals for each chemical element
Other Databases
| Link to USGS MRDS: | 10113927 |
|---|
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
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
