Voelckel claims, western Gila Mountains foothills, Fort Thomas, Gila Valley, Lone Star Mining District (Safford Mining District; Dos Pobres Mining District), Graham County, Arizona, USAi
| Regional Level Types | |
|---|---|
| Voelckel claims | Group of Claims |
| western Gila Mountains foothills | - not defined - |
| Fort Thomas | - not defined - |
| Gila Valley | Valley |
| Lone Star Mining District (Safford Mining District; Dos Pobres Mining District) | Mining District |
| Graham County | County |
| Arizona | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
33° 5' 33'' North , 109° 55' 30'' West
Latitude & Longitude (decimal):
Type:
Group of Claims
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Fort Thomas | 374 (2011) | 7.2km |
| Bylas | 1,962 (2011) | 18.7km |
| Bryce | 175 (2011) | 20.3km |
| Pima | 2,524 (2017) | 23.6km |
| Central | 645 (2011) | 27.9km |
A group of manganese claims with underground workings located in secs. 7 & 18, T4S, R24E, 4½ miles NE of Fort Thomas, at 3,800 feet of altitude on the western slopes of the Gila Mountains, on BLM-administered land. Discovered by Louis Voelckel in 1914.
The manganese deposit consists of narrow and irregular veins that traverse sheared andesite in a northeasterly direction and narrow seams that cement andesite breccia. The veins are short; the longest one can be traced only 30 feet (9.14 meters), and it splits into branches which dip at low angles.
The veins are composed mainly of calcite, with which the manganese oxides are associated generally as concentric crusts of psilomelane and short prismatic crystals of manganite. The manganese oxides were probably derived from the decomposition of the brown calcite.
Workings include a 30 foot (9.14 meters) long tunnel and achieve a depth of 6.1 meters. The deposit proved to be too lean for any commercial development beyond the exploratory adit. The manganese veins were absent beyond the portal area.
Assays data: 18-20% Mn, 6% Fe, 6% SiO2.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Calcite Formula: CaCO3 Colour: White, brown Description: Principal component of manganese oxide-bearing veins. |
| ⓘ Manganite Formula: Mn3+O(OH) Habit: Short prismatic crystals |
| ⓘ 'Psilomelane' Description: Concentric crusts. |
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: | 10026903 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Sonoran DesertDesert
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mazatzal DomainDomain
- Southern Basin and RangeWide Rift
USA
- Gila MountainsMountain Range
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.
