Lone Star Mine, McGrew Spring, Cochise County, Arizona, USAi
| Regional Level Types | |
|---|---|
| Lone Star Mine | Mine |
| McGrew Spring | Spring |
| Cochise County | County |
| Arizona | State |
| USA | Country |
Lone Star Mine, McGrew Spring, Whetstone Mining District, Arizona, USA
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Latitude & Longitude (WGS84):
31° 49' 57'' North , 110° 22' 12'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Whetstone | 2,617 (2011) | 14.1km |
| Whetstone | 2,617 (2017) | 14.9km |
| Pimaco Two | 682 (2011) | 15.3km |
| Benson | 4,888 (2017) | 16.7km |
| Saint David | 1,699 (2011) | 16.7km |
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 |
|---|---|---|
| Huachuca Mineral and Gem Club | Sierra Vista, Arizona | 32km |
Other/historical names associated with this locality:
Lone Star Fluorspar Mine; H&D Mine
A former small underground fluorspar mine located in the SE ¼ sec. 26 & the NE ¼ sec. 35, T.18S., R.19E., 24 km SSW of Benson. Produced 1946. Owned by Cooper Shapely, Jr. of Benson. Also owned and operated by Mr. C.L. Whitelock at some unspecified time.
Mineralization is coarse-grained, banded, greenish fluorspar bordered by dense and vuggy quartz walls in a shear-type fissure vein striking N30W and dipping 80S, hosted in Precambrian Pinal Schist. Ore shoots averaging 2.5 feet thick and as much as 25 feet long and 30 feet deep, contain more than 80% CaF2. Fluorspar in fissure veins in quartz-sericite schist that is contoured and sheared, with the schist foliation striking N15E, and dipping 80SE.
Ore control was a fault. 85% effective CaF2 average mine run (Wilson 1950). 75 - 85% CaF2 average and a grab sample from a stockpile assayed 87% CaF2, 2.7% silica and 0.13% Pb.
Local structures include a fault with 900 meters of vertical displacement located 0.8km east of the mine.
Workings include a shaft(s). Levels at 60, 90, 190, 250, and 300 feet, inclined shaft 80 feet, at least 600 feet total workings, including shaft.
At least 20,000 tons of fluorspar were produced from 1946 through 1967. Production period was 1946 - 1952 and 1967. Arizona's most productive fluorspar mine. A minimum of processing (hand sorting, crushing and screening) necessary to make metallurgical grade.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
6 valid minerals.
Detailed Mineral List:
| ⓘ Covellite Formula: CuS References: |
| ⓘ Fluorite Formula: CaF2 Colour: Greenish Description: Coarse-grained and banded. References: |
| ⓘ Hematite Formula: Fe2O3 References: |
| ⓘ 'Limonite' References: |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 References: |
| ⓘ 'Manganese Oxides' References: |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 References: |
| ⓘ Quartz Formula: SiO2 Description: Dense & vuggy. |
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Covellite | 2.CA.05a | CuS |
| Group 3 - Halides | |||
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
| ⓘ | 'Manganese Oxides' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| C | Carbon | |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| F | Fluorine | |
| F | ⓘ Fluorite | CaF2 |
| Al | Aluminium | |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Covellite | CuS |
| K | Potassium | |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Fluorite | CaF2 |
| Fe | Iron | |
| Fe | ⓘ Hematite | Fe2O3 |
| Cu | Copper | |
| Cu | ⓘ Covellite | CuS |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS MRDS: | 10069410 |
|---|
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
- Arizona
- Whetstone Mining DistrictMining District
- Whetstone MountainsMountain Range
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Lone Star Mine, McGrew Spring, Cochise County, Arizona, USA