Camera location	41° 13′ 03.03″ N, 92° 57′ 16.65″ W	View this and other nearby images on: OpenStreetMap	41.217508; -92.954625

Geolocation inferred from text of The Black Diamond article saying that Fig 9 shows the locomotive approaching the shaft bottom, combined with the photo of the surface works in Figure 1 that locates the tracks relative to the mine shaft. The ghost of an impression of the tracks to the abandoned mine is visible in the 1930's USDA aerial photos available at Iowa Geographic Map Server, which also allows correlation of locations with current aerial photos. The roughest initial guess at the location and the location of the railroad tracks came from file:MarysvilleMines.png.

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