Ref.: Lasky, S.G. & Webber, B.N. (1949), Manganese resources of the Artillery Mountains region, Mohave County, Arizona, USGS Bull. 961.
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: 17, 114 (Table 4).
Arizona Bureau of mines files.
The Alamo District is a Mn-Pb-Cu-Ag-Au-F (Se) mining area that covers the eastern part of the Buckskin Mountains and the alluvial plains in the NE corner of LaPaz Co. It is located in T.9-11N., R.11-14W. It joins the Santa Maria District to the West and was formerly included as part of that district.
The eastern Buckskin Mts are rugged and rough with narrow, steep-walled canyons and alluvial washes produced by dendritic drainage. The North-bordering Bill Williams River cuts through a series of rock canyons separated by some wider, flat, sandy basins. At the eastern end of the district, a broad alluvial plain, with some few remnant rock outcrops, has been formed along Bullard Wash, Date Creek, and the Santa Maria River.
The basal formation of the district appears to be a Precambrian complex of deformed granitic gneiss, impure marble lenses, and schist of sedimentary and volcanic origin. Small patches of apparent Paleozoic and/or Mesozoic quartzites, carbonates, and phyllites rest unconformably on the Precambrian, often along apparent, relatively-flat fault contacts. Again, unconformably, late Tertiary fanglomerates, arkose, limestone, basalt, latite, and rhyolite locally cover the older rocks. Some small and local intrusions of monzonite of uncertain Mesozoic or Laramide age also are found. Erosional remnants of Quaternary basalt are present and Tertiary to Quaternary alluvium covers large basin areas. Strong structural deformation and erosion is evident throughout the district but the geologic history is not yet well defined.
Major economic mineralization found in the district has been the relatively low grade manganese deposits, of apparent syngenetic origin, in late Tertiary beds. The small, irregular, largely oxidized vein deposits of copper and lead with variable gold and silver values occur in the Precambrian complex but are usually closely associated with, or above, the apparent fault plane between the Precambrian and later formations.
Production in the district amounts to over 160,000 long tons of low-grade, crude manganese ore, most during the major period of production in the 1950's. Total recorded and estimated production of base and precious metals would be some 824 tons of ore containing about 27 tons of lead, 22 tons of copper, 984 ounces of silver, and 66 ounces of gold.
Mineral List
Mineral list contains entries from the region specified including sub-localities
The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.
This page is currently not sponsored. To sponsor this page click here.
Mineral and Locality Search
