Elevation: 2,402 feet
The Pioneer mine, formerly known as the German-American, is about 1.5 miles southwest of Oatman.
In 1902, the Gold Road Company did some development work on this property. During 1903-1906, the German-American Mining Company produced 2,700 tons of ore that averaged about $10 in gold per ton. Some production was made by lessees in 1925, 1930, and 1932.
The Pioneer vein strikes N. 13° W., and dips 800 E. Its hanging wall is Oatman andesite and its foot wall for 2,000 feet is Alcyone trachyte. The vein intersects the Gold Dust-Boundary Cone fault zone at an angle of about 400, but neither vein shows offsetting by the other. Near the Pioneer shaft, the vein has its maximum width of about 18 feet. There, it consists of coarse¬grained, gray calcite and quartz that are of rather low grade except in iron-stained zones of crushing.
Several small ore bodies were mined towards the southern end of the Pioneer vein. One of them, near the Treadwell shaft, was about 400 feet long by a maximum of 3.5 feet wide, but terminated abruptly near the 400 level Specimens of this ore consist of quartz and un replaced calcite, with some fourth-stage, greenish quartz.
North of the Thirty-fifth Parallel shaft, a shoot about 200 feet long by 3 feet wide yielded iron-stained ore from near the surface.
Near the Pioneer shaft, at the northern end of the property, narrow portions of the vein assay more than $10 per ton and yielded some relatively rich ore from near the surface.
Source: Arizona Lode Gold Mines and Gold Mining, Bulletin137, Arizona Bureau of Mines. Revised 1967