Hells Hollow prospect, Willow Springs, Coconino Co., Arizona, USAi
|Regional Level Types|
|Hells Hollow prospect||Prospect|
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Latitude & Longitude (WGS84):
36° 9' 18'' North , 111° 29' 18'' West
Latitude & Longitude (decimal):
Köppen climate type:
An U occurrence located in approximate sec. 13, T32N, R8E, G&SRM, 9.3 km (5.8 miles) WSW of Willow Springs. This locality is not listed in the USGS MRDS database. Geographic coordinates presented are approximate to the center of sec. 13.
Mineralization is an U deposit hosted in an apparent 100 foot diameter sandstone mass cutting the Hermit Shale about 50 feet below Coconino Sandstone and 800 feet above the Redwall Limestone. Radioactivity is highest on mudstone horizons in bleached Hermit Shale with iron-manganese nodules, gypsum filled fractures and large scale liesegang rings. Radiation level: 140 counts per second (cps).
Workings include exploratory operations comprised of 3 drill holes.
Regions containing this locality
|North America Plate||Tectonic Plate|
|Colorado Plateau, USA||Plateau|
|Navajo Nation Indian Reservation, USA||Reservation|
|Hopi-Navajo Indian Reservations, Colorado Plateau, Apache; Navajo and San Juan Cos., Arizona & Utah, USA|
Select Mineral List TypeStandard Detailed Strunz Dana Chemical Elements
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
1 valid mineral.
Rock Types Recorded
Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List TypeAlphabetical List Tree Diagram
Detailed Mineral List:
| ⓘ Gypsum|
Formula: CaSO4 · 2H2O
Description: Occurs as fracture fillings.
Reference: Scarborough, Robert B. (1981), Radioactive occurrences and uranium production in Arizona, Arizona Bureau of Geology and Mineral Technology Report for U.S. Department of Energy (Atomic Energy Commission), GJBX-143. RME-2071: 151.
List of minerals arranged by Strunz 10th Edition classification
|Group 7 - Sulphates, Chromates, Molybdates and Tungstates|
|ⓘ||Gypsum||7.CD.40||CaSO4 · 2H2O|
List of minerals arranged by Dana 8th Edition classification
|Group 29 - HYDRATED ACID AND NORMAL SULFATES|
|ⓘ||Gypsum||220.127.116.11||CaSO4 · 2H2O|
List of minerals for each chemical element
|H||ⓘ Gypsum||CaSO4 · 2H2O|
|O||ⓘ Gypsum||CaSO4 · 2H2O|
|S||ⓘ Gypsum||CaSO4 · 2H2O|
|Ca||ⓘ Gypsum||CaSO4 · 2H2O|
Sort byYear (asc) Year (desc) Author (A-Z) Author (Z-A)
Scarborough, Robert B. (1981), Radioactive occurrences and uranium production in Arizona, Arizona Bureau of Geology and Mineral Technology Report for U.S. Department of Energy (Atomic Energy Commission), GJBX-143. RME-2071: 151.
U.S. Department of Energy files.
USGS Vulcans Throne, Arizona, quadrangle 7½ minute topo map.
Grand Canyon NTMS.
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