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1962 Map of Illinois Hill

Name: 1962 Topographic Map of Illinois Hill
Creator: U.S. Geological Survey
Published: 1963
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1963

About this map

The gold-bearing foothills of Mariposa County are meticulously detailed here in the early 1960s, revealing an landscape defined by its mining heritage and cattle ranching terrain. The settlement of Ganns serves as a central point along White Rock Road, which winds through a territory marked by numerous mineral extractions. Hard-rock history is evident in the cluster of workings such as the Great Northern Mine, Pocahontas Mine, and the colorfully named Toad Mine.

Hydrology and topography dictate the land use, with drainage systems like Mariposa Creek and Deadman Creek carving through the granite and metamorphic ridges. Landmarks like Ward Mtn and Cow and Calf Mtn provide vertical relief, while the White Rock Fire Control Sta and White Rock Cemetery anchor the local community. The distribution of jeep trails and scattered water sources like the Mariposa Reservoir indicate a region balanced between active land management and the remnants of its nineteenth-century prospecting roots.