Gila Mine (Plot No. 4 Mine), Black Rock Point, Black Rock Point Mining District, Carrizo Range, Apache Co., Arizona, USAi
|Regional Level Types|
|Gila Mine (Plot No. 4 Mine)||Mine|
|Black Rock Point||- not defined -|
|Black Rock Point Mining District||Mining District|
|Carrizo Range||Mountain Range|
A former U-V occurrence/mine located in the SE¼ sec. 1 & N-central sec. 12, T40N, R28E, G&SRM, 5.6 km (3.5 miles) NNW of Black Rock Point (coordinates of record) and 0.5 miles W of Tsitah Wash, on the N prong of Dry Mesa.
Mineralization is tyuyamunite in irregular, tabular layers hosted in Late Jurassic claystone, siltstone, and sandstone of the Salt Wash Member of the Morrison Formation, on the NE limb of the Toh Atin anticline. The ore is found in clusters, usually with carbonaceous detritus. Carbonized logs and trash are abundant. Local rocks include rocks of the Morrison Formation.
Workings include underground openings comprised of an adit.
Production was 22 tons of ore @ 0.17% U3O8; 1.82% V2O5 (1960-1961). A portion was shipped in 1949 as West Reservation lease.
Resources are limited.
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This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Tithonian - Oxfordian|
145 - 163.5 Ma
Age: Jurassic (145 - 163.5 Ma)
Stratigraphic Name: Morrison Formation
Description: Commonly cliff-forming, cross-bedded sandstone lenses alternating with slope-forming siltstone, mudstone and shale. Colors are highly variable, and include greenish gray, reddish brown, pink, white, and purple. Sands were deposited by braided streams with finer sediment representing overbank or lacustrine deposits. (145-160 Ma)
Comments: Original map source: Arizona Geological Survey, DI-8 Geologic Map of Arizona, Digital Spatial data for the Geologic Map of Arizona, v. 3.0, edited by S.M. Richard and S.M. Kneale, 2002, 10 p., 2 DOS HD disks. Arc/INFO export file (.e00) format, scale 1:1,000,000.
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. 
|Early Jurassic - Late Triassic|
174.1 - 237 Ma
|Mesozoic sedimentary rocks|
Age: Mesozoic (174.1 - 237 Ma)
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.