Pioneer Mine (Tolbard Mine), Whedon claims, Midway Well, Paymaster Mining District, Chocolate Mountains, Imperial County, California, USAi
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Latitude & Longitude (WGS84):
33° 12' 15'' North , 114° 48' 1'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Cibola | 250 (2011) | 17.7km |
Palo Verde | 171 (2011) | 26.2km |
Ripley | 692 (2011) | 38.1km |
Mesa Verde | 1,023 (2011) | 45.1km |
Blythe | 19,208 (2017) | 48.9km |
Mindat Locality ID:
210655
Long-form identifier:
mindat:1:2:210655:0
GUID (UUID V4):
41c30480-c348-472b-b4c0-57320a7790a9
A former Mn occurrence/mine located in the SE¼ sec. 18, & in the NE¼ sec. 19, T11S, R21E, SBM, 5.8 km (3.6 miles) ESE of Midway Well. MRDS database accuracy for this location is not stated.
The most extensive workings are at the Tolbard Mine, where veins No. 1, No. 2 and No. 3 have been explored along the strike for 415 feet, 375 feet and 40 feet respectively. On veins No. 1 and No. 2, ore has been taken from overhead stopes 20 to 40 feet high and from underhand stopes 5 to 15 feet deep. These stopes are largely without timbering and are inaccessible because of their steep walls. They range in width from 4 feet to less than 1 foot. Most of them were opened only to the width of the vein, the ore breaking along post-ore faults at one or both sides Aside from the stopes, the workings consist chiefly of drifts along the veins. A crosscut from the shaft on vein No. 1, 30 feet below the collar, lacks a few feet of intersecting vein No. 2. Judging from the size of the stopes, about 1,300 tons of high-grade ore have been removed by underground workings from vein No. 1, and about 500 tons from vein No. 2. Good ore is exposed at several places in the workings on both veins, leading to the belief that several hundred tons remain, principally in undeveloped ground below the drifts.
Local rocks include Precambrian igneous and metamorphic rock complex.
Workings include unspecified surface openings.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
ⓘ Manganite Formula: Mn3+O(OH) References: |
ⓘ Pyrolusite Formula: Mn4+O2 References: |
ⓘ Ramsdellite Formula: Mn4+O2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 4 - Oxides and Hydroxides | |||
---|---|---|---|
ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
ⓘ | Ramsdellite | 4.DB.15a | Mn4+O2 |
ⓘ | Manganite | 4.FD.15 | Mn3+O(OH) |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Manganite | Mn3+O(OH) |
O | Oxygen | |
O | ⓘ Manganite | Mn3+O(OH) |
O | ⓘ Pyrolusite | Mn4+O2 |
O | ⓘ Ramsdellite | Mn4+O2 |
Mn | Manganese | |
Mn | ⓘ Manganite | Mn3+O(OH) |
Mn | ⓘ Pyrolusite | Mn4+O2 |
Mn | ⓘ Ramsdellite | Mn4+O2 |
Other Regions, Features and Areas containing this locality
North America
- Sonoran DesertDesert
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mojave DomainDomain
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