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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
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Latitude: 33°3'37"N
Longitude: 114°10'40"W
 
 
A former underground Pb-Ag-F-Ba-V-Mo-Zn-Au-Cu (As-Se-Be-Sb) mine group located in SW¼ sec. 24 & the North-central sec. 25, T4S, R19W (protracted), on the W side of the Castle Dome Mountains; about 3 miles N of Castle Dome Mine, 4 miles SW of Castle Dome Peak, on federal land. Started in 1863. Owned at times, or in part, by Castle Dome Mining & Smelting Co., Gondolfo & Sanquinetti, Mrs. Elizabeth De Luce, Castle Dome Mining Co., Hull Mines, Rialto Co., Joplin Lead Co., Wall, Desert Lead Co., and Taylor. Owned by Mr. G. Hull (1933). The Rialto-Hull group is considered as part of the Castle Dome Mine group.

Mineralization is irregular masses of partly oxidized argentiferous galena in a gangue of fluorite and calcite, up to 12 feet (3.66 meters) wide, and over some 2,000 feet (609.6 meters) in length, in a lensing vein along a fault zone with intersecting faults containing gouge and mineralization. The ore zone has a depth to bottom of 91.44 meters, strikes N30W, and dips 70NE. 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. A related rock unit is the Kofa volcanics. Tectonic influences include basin and range block faulting. Ore control was the fault zone containing intersecting faults and gouge. Ore concentration was supergene enrichment.

The vein follows a fault zone in shale. Green, purple, and rose coloured fluorite is associated with calcite, baryte, galena and wulfenite in veins where metasediments have been intruded by rhyolite and diorite porphyry. Veins split and branch but are traceable for as much as 4000 feet. The fluorspar ore is usually < 5 feet thick.

Workings include stopes worked from a series of shafts down to about 200 feet, and total 518.16 meters in length. Most ore was mined prior to 1900 but fill & dumps were worked to 1960. Total production for the group would be some 20,000 tons or more of ore; about 8333 tons of ore averaging 5% Pb, 2% Cu, 1.96% oz/t Ag, minor Au.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Anglesite
Aragonite
Baryte
Calcite
Cerussite
'Chlorite Group'
Fluorite
Galena
Galena
var: Argentiferous Galena

Mimetite
var: Vanadian Mimetite
Muscovite
var: Sericite

Pyromorphite
Vanadinite
Willemite
Wulfenite


27 entries listed. 12 valid minerals.

Localities in this Region

USA

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References

Blake (1880).

Blake, William P. (1881a), Vanadinite in Arizona, American Journal of Science: 22: 235.

Blake, William P. (1881b), On the occurrence of vanadates of lead at the Castle Dome mines in Arizona, American Journal of Science: 22: 410-411.

Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 99-100.

Phelps, Harlow D. Fluorspar Lead Silver Mines Castle Dome District. War Minerals Report O.

Haury, P.S. (1945) US Bureau of Mines Report on Arizona Lead Co, July, 1945.

Wilson, E.D., et al (1950), Arizona zinc & lead deposits, Part I, Arizona Bureau of Mines Bull. 156.

Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 111-112.

Van Alstine, R.E. and Moore, R.T. (1969) Fluorspar, in USGS & Arizona Bureau of Mines & U.S. Bureau of Reclamation, Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull.871): 354.

Minerals Availability Systems: Arizona Fluorspar, Arizona Department of Mineral Resources, March 1976.

Keith, Stanton B. (1978), State of Arizona Bureau of Geology and Mineral Technology, Geol. Sur. Br. Bull. 192, Index of Mining Properties in Yuma County, Arizona: 120 (Table 4).

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10103550, MRDS ID M030326; and, Dep. ID #10186691.

US Bureau of Mines file data cluster 343, Rialto Group.

U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology production file data.

Arizona Bureau of Mines file data.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0040270030.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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