Eroded boulders, Esperanee hydraulic mine. French Corral, Nevada County, California. 1909.
Dates
Date Taken
1909
Summary
Eroded boulders, Esperanee hydraulic mine, near French Corral. The boulders were part of the pavement of a sluice box through which gravel and sand were run continuously for three months, and the facets of their upper surfaces were produced by the attrition.
Summary
Eroded boulders, Esperanee hydraulic mine, near French Corral. The boulders were part of the pavement of a sluice box through which gravel and sand were run continuously for three months, and the facets of their upper surfaces were produced by the attrition.
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