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Escondida claims, Fresnal Canyon, Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima Co., Arizona, USAi
Regional Level Types
Escondida claimsGroup of Claims
Fresnal CanyonCanyon
Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District)Mining District
Sierrita MountainsMountain Range
Pima Co.County

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Latitude & Longitude (WGS84):
31° 54' 23'' North , 111° 12' 21'' West
Latitude & Longitude (decimal):
Locality type:
Group of Claims
Nearest Settlements:
Green Valley21,391 (2011)20.8km
Three Points5,581 (2011)21.5km
Arivaca Junction1,090 (2011)24.1km
Sahuarita25,707 (2017)24.3km
Amado295 (2011)25.8km

Ref.: US Atomic Energy Commission Preliminary Reconnaissance Report Pima County (1955): 641.

U.S. Atomic Energy Commission RME-159 (1970) Preliminary Reconnaissance for Uranium in Pima and Pinal Counties, Arizona, 1950 to 1957: 197.

MRDS database Dep. ID file #10048218, MRDS ID #M800303; and, Dep. ID #10210585, MAS ID #0040190220.

A Cu-U occurrence/group of claims with surface workings located in sec. 34, T17S, R11E, near the Gunsight Ranch, on private land. Owned by C. Lemons and O. Parmer (1955).

Mineralization is ore that strikes N70E and dips 65N, and is hosted in mafic intrusive rock. Radioactivity: background 0.04 mr/hr, 0.16 mr/hr.

Workings include 2 pits.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

3 valid minerals.

Detailed Mineral List:

Formula: CuFeS2
Reference: MRDS database Dep. ID file #10048218, MRDS ID #M800303.
Formula: FeS2
Reference: MRDS database Dep. ID file #10048218, MRDS ID #M800303.
Formula: UO2
Reference: MRDS database Dep. ID file #10048218, MRDS ID #M800303.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Group 4 - Oxides and Hydroxides

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
AmBnXp, with (m+n):p = 1:2

List of minerals for each chemical element

O UraniniteUO2
S ChalcopyriteCuFeS2
S PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
Cu ChalcopyriteCuFeS2
U UraniniteUO2

Other Databases

USGS MRDS Record:10048218

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

This page contains all mineral locality references listed on 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 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.
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