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1986 Map of Placer Canyon

Name: 1986 Topographic Map of Placer Canyon
Creator: U.S. Geological Survey
Published: 1987
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1987

About this map

Industrial mining operations meet the protected desert landscape in this mid-1980s study of the Eagle Mountains. The southern portion of the sheet is dominated by the massive Eagle Mountain Mine and its associated Central Deposit, highlighting the intense extraction activity that defined this corner of Riverside County. These workings sit just south of the National Monument and Wilderness Boundary, creating a sharp contrast between the industrial footprint and the preserved wilderness of the Joshua Tree National Monument.

Drainage patterns across the Pinto Basin are defined by the broad reach of Pinto Wash, while the higher elevations feature historic claims like the Black Eagle Mine and Cactus Mine. The presence of the Black Eagle Well underscores the critical importance of water sources for both survival and mineral processing in this arid environment. The map captures a moment when large-scale mining coexisted directly alongside the expanding boundaries of the Joshua Tree Wilderness.