Mineral Farm Mine (Mineral Farms group; Mineral Farm group; Moonlight & Mineral Farm group; Eagle Pass group of claims; Moonlight; Bennett), Big Johnnie Gulch, Copper Hill, Globe Hills Mining District, Gila County, Arizona, USAi
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Latitude & Longitude (WGS84):
33° 26' 47'' North , 110° 46' 11'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Copper Hill | 108 (2011) | 1.8km |
| Globe | 7,396 (2017) | 6.0km |
| Central Heights-Midland City | 2,534 (2011) | 6.4km |
| Claypool | 1,538 (2011) | 7.8km |
| Pinal | 439 (2011) | 7.9km |
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 |
|---|---|---|
| Gila County Gem & Mineral Society | Miami, Arizona | 11km |
A former surface Mn-Cu-Ag-Zn-Pb mine on a group of 21 manganese claims located in the SW¼ sec. 10, T1N, R15E, near the head of Big Johnnie Gulch, 0.3 miles N of Black Peak, just N of the Copper Hill ghost town and about 3 miles North of Globe, East of the Superior and Globe Comm. Copper Company's properties, on private land. Discovered 1878 and produced 1918-1953. The Moonlight & Mineral Farm group was originally part of 21 claims called the Mineral Farm or Eagle Pass group, including Big Iron, Vacey Constance & Iron Hive groups. The complexte group was operated by Mineral Farm Co. in the 1900's; Globe Mining (1913); and Moline & Arizona (1917). Ten of the Moonlight-Mineral Farm claims currently owned by John R. Bacon (1951) & by F.A. Sitton.
Mineralization is a group of small veins of manganous iron ore that crop out about ½ mile NW of Black Peak in a sill-like body of diabase intruded into the lower part of the Pioneer formation The basement rock in this area is Pinal schist. The veins are along a network of branching fissures that strike N20E to east and dip 45NW to vertical. They range in size from thin stringers and inch or two (2.5 to 5 cm) wide to zones of partly replaced breccia 6 feet wide. They cut diabase & quartzite. The veins were formed by replacement of gouge and angular breccia fragments along the fissures. The ore zone is 152.4 meters long, 1.83 meters wide, strikes N80E and dips 60NW.
The vein matter is completely oxidized and consists of porous and honeycombed quartz and angular fragments of altered and partly replaced diabase with ribs of hard "psilomelane-like" minerals and pockets of soft, earthy oxides of Mn & Fe. Many vugs are filled with crystals of manganite., and some manganite occurs with the earthy oxides.
The most abundant vein minerals are quartz, carbonates and sulfides. The sulfides are closely associated with, and appear to replace, the carbonates, which are cut by veinlets of quartz. Specular hematite is intergrown with the quartz, and also with all the sulfides, particularly sphalerite.
The above description is for the Mn deposit. The Cu-Ag deposit (Yuma vein) strikes N40E and dips steeply NW.
Workings include a 215 foot deep shaft and many shallow pits less than 5 feet (150 cm) deep. The developments reach a depth of 365.76 meters. The Yuma vein has been developed by a 1200 foot deep shaft and a 160 foot tunnel. Production is from the Moonlight vein & the Mineral Farm claims No. 4. Most of the manganese production is from shallow pits and open cuts. Mineral Farm Co. is said to have shipped Ag ore; Moline & Arizona shipped Cu-Ag ore. John R. Bacon (1951) & F.A. Sitton both shipped Mn ore.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Ankerite Formula: Ca(Fe2+,Mg)(CO3)2 |
| ⓘ Bornite Formula: Cu5FeS4 Description: As islands in chalcocite and shredlike remnants of chalcopyrite. |
| ⓘ Chalcocite Formula: Cu2S Description: Replaces sphalerite and galena & is altered to covellite along boundaries with gangue minerals and specularite. |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Chrysocolla Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| ⓘ Covellite Formula: CuS Description: Altered from chalcocite. |
| ⓘ Galena Formula: PbS Description: Rounded masses invariably surrounded by sphalerite. |
| ⓘ Hematite Formula: Fe2O3 Habit: Plate-like Description: Bunches and stringers in limonite; intergrown with quartz & all the sulfides, particularly sphalerite. References: |
| ⓘ Hematite var. Specularite Formula: Fe2O3 Habit: Plate-like Description: Bunches and stringers in limonite; intergrown with quartz & all the sulfides, particularly sphalerite. References: |
| ⓘ 'Limonite' |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ Manganite Formula: Mn3+O(OH) |
| ⓘ Pyrolusite Formula: Mn4+O2 Description: Occurs as bunches & stringers in specularite. |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Rhodochrosite Formula: MnCO3 |
| ⓘ Sphalerite Formula: ZnS Description: Surrounds rounded masses of galena; replaced by chalcocite. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
| ⓘ | Covellite | 2.CA.05a | CuS |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | var. Specularite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| ⓘ | Manganite | 4.FD.15 | Mn3+O(OH) |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
| ⓘ | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
| Group 9 - Silicates | |||
| ⓘ | Chrysocolla | 9.ED.20 | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| H | ⓘ Manganite | Mn3+O(OH) |
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | ⓘ Rhodochrosite | MnCO3 |
| O | Oxygen | |
| O | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| O | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Manganite | Mn3+O(OH) |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | ⓘ Pyrolusite | Mn4+O2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rhodochrosite | MnCO3 |
| O | ⓘ Hematite var. Specularite | Fe2O3 |
| Mg | Magnesium | |
| Mg | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Al | Aluminium | |
| Al | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Si | Silicon | |
| Si | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Bornite | Cu5FeS4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Chalcocite | Cu2S |
| S | ⓘ Covellite | CuS |
| S | ⓘ Galena | PbS |
| S | ⓘ Sphalerite | ZnS |
| Ca | Calcium | |
| Ca | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Mn | Manganese | |
| Mn | ⓘ Manganite | Mn3+O(OH) |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
| Mn | ⓘ Rhodochrosite | MnCO3 |
| Fe | Iron | |
| Fe | ⓘ Ankerite | Ca(Fe2+,Mg)(CO3)2 |
| Fe | ⓘ Bornite | Cu5FeS4 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Hematite var. Specularite | Fe2O3 |
| Cu | Copper | |
| Cu | ⓘ Bornite | Cu5FeS4 |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Chalcocite | Cu2S |
| Cu | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Cu | ⓘ Covellite | CuS |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 10027475 |
|---|
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
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