
Grass Valley and Nevada City anchor this late nineteenth-century portrait of California's hydraulic and deep-rock mining heartland. The landscape is a dense network of industrial activity, where the Challenge Mill R.R. and the Narrow Gauge R.R. facilitated the transport of timber and ore. Significant operations such as the Empire Mine, Idaho Mine, and North Star Mine are clearly marked, illustrating the sheer scale of the gold-seeking infrastructure.
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