Lincoln Mine group (Lincoln claims; La Colorado Mine group; Colorado group of claims; La Colorada group; Modesti property), Castle Dome Mine group, Kofa Game Range, Castle Dome District, Castle Dome Mts, Yuma Co., Arizona, USA

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A former underground Pb-Ag-F-Ba-V-Mo-Zn-Au-Cu (As-Se-Be-Sb) mine located in the center of E½ sec. 36, T4S, R19E, and sec. 1 & East-central sec. 12, T5S, R19W (protracted), and extend southward from the Union shaft, 6 miles SW of Castle Dome Peak, on federal land. Owned at times, or in part, by Mrs. E. Lincoln (1933); Mr. A.P. Modesti, Laguna and Hudson (before 1900).

Mineralization is a vein deposit with spotty bunches and pockets of partly oxidized, argentiferous galena in a gangue of calcite, fluorite, and minor barite, with copper staining, in lensing, 1- to 8-foot wide veins along fissures at the contacts of Mesozoic shale and limestone with diorite porphyry dikes. The ore zone is 60.96 meters depth to bottom. Wall rocks show strong silicification and sericitization. Ore shoots extend downward about 200 feet. Ore control was along fissures at shale and limestone contacts with diorite porphyry dikes. The associated rock unit is the Kofa volcanics. Tectonics included block faulting. croppings partially covered by surface gravels overburden.

Workings include stoping operations from shafts in the late 1800's and early 1900's. Total estimated and recorded production would be some 965 to 1,400 tons of ore averaging about 43% Pb and 38 oz. Ag/T. Some fluorspar was also shipped. Fill and dumps were reworked in the late 1940's.

References

Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bull. 134: 102.

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.

Galbraith, F.W. (1947), Minerals of Arizona, Arizona Bureau of Mines Bull. 153: 18.

Wilson, E.D., et al (1950), Arizona zinc & lead deposits, Part I, Arizona Bureau of Mines Bull. 156: 98, 115.

Wilson, E.D., et al (1951), Arizona zinc and lead deposits, part II, Arizona Bureau of Mines Bull. 158: 114.

Wilson, E.D. (1957): 114.

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.

Mineral Availability System (MAS): Arizona Fluorspar, Arizona Department of Mineral Resources, March, 1976.

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).

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

Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.

Arizona Bureau of Mines file data.

US Bureau of Mines card file.

MRDS database Dep. ID #10000274, MRDS ID #M002610; and, Dep. ID #10060289, MRDS ID #TC10305; and, Dep. ID #10137866, MS ID #0040270812; and, Dep. ID #10210182, MAS ID #0040270034.

Mineral List

Baryte Calcite

'Copper Stain' Fluorite

Galena var: Argentiferous Galena Muscovite var: Sericite

Wulfenite

7 entries listed. 4 valid minerals.