Feldman and Winkelman Gypsum pits (Feldman Quarry; National Gypsum Co. Mine), PZ Ranch area, Dudleyville area, Pinal County, Arizona, USAi
| Regional Level Types | |
|---|---|
| Feldman and Winkelman Gypsum pits (Feldman Quarry; National Gypsum Co. Mine) | Group of Pits |
| PZ Ranch area | - not defined - |
| Dudleyville area | Area |
| Pinal County | County |
| Arizona | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
32° 52' 41'' North , 110° 41' 31'' West
Latitude & Longitude (decimal):
Type:
Group of Pits
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Dudleyville | 959 (2011) | 13.1km |
| Winkelman | 346 (2017) | 14.2km |
| Hayden | 650 (2017) | 16.6km |
| Mammoth | 1,487 (2017) | 17.9km |
| Kearny | 2,038 (2017) | 28.5km |
Mindat Locality ID:
47706
Long-form identifier:
mindat:1:2:47706:5
GUID (UUID V4):
c25a18b1-e58a-4101-8d69-16e2517bafac
A Gypsum occurrence located in secs. 26, 27 & 33, T6S, R16E, about 3¼ miles S of Dudleyville, on the East side of the San Pedro River, about 8½ miles South of Winkleman. Operated by the National Gypsum Co. and the Superior Companies.
Mineralization is thick beds of lacustrine gypsum deposits on both sides of the river. Gypsum is white to greyish white, granular to microcrystalline gypsum beds. The beds are 2.44 meters thick hosted in clay, mud, silt, diatomite and shale. They dip 3E.
This deposit may be extensive in area. It is exposed near the surface where it was mined, but, it is buried to the S and E and eroded away to the W and N except in isolated residual hills. Diatomite occurs as interbeds in the gypsum. In this area, a zone at least 100 feet thick contains thick (1-8 feet), massive, white to grayish white, granular to microcrystalline, flat-lying gypsum beds. The gypsum beds are separated by thin layers of calcareous and gypsiferous shale and silt.
The shale is calcareous to gypsiferous. The lacustrine basin occupies at least 18 square miles, principally along the east side of the San Pedro River, and dips about 3E. An exploration hole drilled to evaluate one of the deposits intersected a continuous 300 foot thick formation of interbedded clay and gypsum. Correlation with other drill holes suggests that the section of clay and gypsum may be more than 595 feet thick. Aravaipa Creek bisects the deposit. North of the creek, massive gypsum with clay partings (30-50 feet thick) is being mined.
The gypsum ore is drilled and blasted; then the broken gypsum is loaded and hauled to crushing plants where the minus 3/8 inch fraction is screened off. The final product contains 92% gypsum and less than 4% insolubles.
Assay data: Mostly 90% + gypsum. Reserves and resources are not estimated but are probably in the multimillion ton range.
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
2 valid minerals.
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 DiagramDetailed Mineral List:
| ⓘ Gypsum Formula: CaSO4 · 2H2O Description: Thick beds. |
| ⓘ Opal Formula: SiO2 · nH2O |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Opal | 4.DA.10 | SiO2 · nH2O |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Gypsum | 7.CD.40 | CaSO4 · 2H2O |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Gypsum | CaSO4 · 2H2O |
| H | ⓘ Opal | SiO2 · nH2O |
| O | Oxygen | |
| O | ⓘ Gypsum | CaSO4 · 2H2O |
| O | ⓘ Opal | SiO2 · nH2O |
| Si | Silicon | |
| Si | ⓘ Opal | SiO2 · nH2O |
| S | Sulfur | |
| S | ⓘ Gypsum | CaSO4 · 2H2O |
| Ca | Calcium | |
| Ca | ⓘ Gypsum | CaSO4 · 2H2O |
Other Databases
| Link to USGS MRDS: | 10060185 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Sonoran DesertDesert
- San Pedro river valleyValley
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mazatzal DomainDomain
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.
References
