1962 Map of Penon Blanco Peak

About this map

The Tuolumne Co Mariposa Co border bisects this rugged gold country landscape, where the legacy of early California mining is etched into every ridge and gulch. Numerous hard-rock operations including the Solambo Mine, White Rock Mine, and Diamond Mine follow the geological veins of the Penon Blanco Ridge. This edition is particularly distinctive for its mapping of massive hydrological changes, showing the Lake McClure and Don Pedro Reservoir footprints over older terrain. Small family settlements and ranching hubs like Blanchard and Bonds Flat appear alongside local landmarks such as the Granite Spring Cem. The topography between Piney Ridge and Oat Hills reveals a landscape defined by deep gulches like Neg Gulch and Picture Gallery Gulch, tracing the transition from early mining claims to the era of large-scale water management.