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Hull Mine, Hull Mine group (Rialto Mine group; Hull group of claims; Rialto claims), Buckeye vein group, Castle Dome Mine group, Kofa Game Range, Castle Dome District, Castle Dome Mts, Yuma Co., Arizona, USA

This page kindly sponsored by Steve Brighton
Latitude & Longitude (WGS84): 33° 3' 33'' North , 114° 10' 39'' West
Latitude & Longitude (decimal): 33.05917,-114.17750
Other regions containing this locality:Sonoran Desert, North America
Köppen climate type:BWh : Hot deserts climate

A Pb-Ag-F-Ba-V-Mo-Zn-Au-Cu (As-Se-Be-Sb) mine.

Mineralization is irregular masses of partly oxidized argentiferous galena in a gangue of fluorite and calcite, up to 12 feet wide, and over some 2,000 feet in length, in a lensing vein along a fault zone with intersecting faults containing gouge and mineralization. Some wulfenite and associated vanadinite and vanadiferous mimetite occur in open cavities. Wall rocks are Mesozoic shale, limestone, and sandstone, strongly sericitized with some silicification and chloritization, cut by diorite porphyry dikes. Surface exposures are limited by the gravel cover of the rock pediment.

Workings include stopes worked from shafts. Total production for the group would be some 20,000 tons or more of ore.

Mineral List

14 valid minerals.

Regional Geology

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

Quaternary - Miocene
0 - 23.03 Ma

ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary rocks

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. [154]

Tithonian - Bajocian
145 - 170.3 Ma

ID: 2809091
Jurassic sedimentary and volcanic rocks

Age: Jurassic (145 - 170.3 Ma)

Stratigraphic Name: Gardner Canyon Formation; Rudolfo Redbeds; Recreation Red Beds; Topawa Group; Harquar Formation

Description: Sandstone and conglomerate derived from volcanic rocks with associated intermediate-composition lava flows, breccias, and tuffs. In southern Arizona this unit includes rocks of the Artesa sequence, Pitoikam Formation, Mulberry Wash volcanics, Rudolfo Red Beds, Recreation Red Beds, and Gardner Canyon Formation. In western Arizona it includes the Harquar Formation, rocks of Slumgullion, and related(?) unnamed units in the Kofa and Middle Mountains. This unit is characterized by maroon, brown, and purplish-gray volcanic-lithic sandstone and siltstone, with subordinate to abundant conglomerate, quartz-rich sandstone and sparse limestone. (150-170 Ma)

Lithology: Major:{sandstone,siltstone,conglomerate}, Minor:{felsic volcanic,limestone}

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. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Blake (1880).
Blake, William P. (1881a), Vanadinite in Arizona, American Journal of Science: 22: 235.
Blake, William P. (1881b [1882]), On the occurrence of vanadates of lead at the Castle Dome mines in Arizona, American Journal of Science, 3rd series: 22: 410-411.
Ladoo, R.B. (1923), Fluorspar mining in the western states, U.S. Bureau of Mines Report of Investigation 2480.
Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 99-100.
Batty, J.V., et al (1947), Concentration of fluorite ores from Arizona, California, Idaho, Montana, Nevada, and Wyoming, US Bur. Mines Rept. Inv. 4133.
Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 18.
Peterson, N.P. (1947), Phosphate minerals in the Castle Dome copper deposit, Arizona, American Mineralogist: 32: 574-582.
Wilson, E.D. (1951) Castle Dome district, Chap. X, in Arizona zinc and lead deposits, Part II: Arizona Bureau of Mines Bulletin no. 158: 111-112.
Keith, Stanton B. (1978), State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 192, Index of Mining Properties in Yuma County, Arizona: 120 (Table 4).
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 159, 224-225, 229, 411.
Arizona Bureau of Mines file data.

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