Surprise claim (Pocahontas Mine/claim), 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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A Pb-Ag-F-Ba-V-Mo-Zn-Au-Cu (As-Se-Be-Sb) mine. Started before 1880. Owned by the Castle Dome Mining & Smelting Co., New York; and, the Hull or Rialto Co. (1916- ).

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 a shaft at 250 feet deep and stopes worked from a series of shafts down to about 200 feet. Connected to the Railroad Mine by a 200 foot long drift. Total production for the group would be some 20,000 tons or more of ore.

References

Blake (1880).

The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Prescott, AZ: 72.

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.

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

Wilson, E.D., et al (1951), Castle Dome district, Chap. X, in Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 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).

Arizona Bureau of Mines file data.

Mineral List

Calcite 'Chlorite Group' Fluorite

Galena var: Argentiferous Galena Mimetite var: Vanadian Mimetite

Muscovite var: Sericite Vanadinite Wulfenite

9 entries listed. 5 valid minerals.