Filters: Tags: Esperance Hydraulic Mine (X)
4 results (43ms)|
Filters
Date Range
Contacts Categories Tag Types Tag Schemes |
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.
Categories: Image;
Tags: Esperance Hydraulic Mine,
Mills, Mines, Quarries,
Nevada County, California,
photo print
Auriferous gravel (Pliocene) exposed in Esperance hydraulic mine near French Corral. This is a horizontal continuation of the formation represented in photo no. 3236, and shows it where so near the surface as to have been disturbed by roots and burrowing animals. The softer materials are uniformly mixed, so as to constitute a practically structureless ground-mass in which the resistant quartz pebbles are embedded. Nevada County, California. 1909.
Categories: Image;
Tags: Esperance Hydraulic Mine,
Mills, Mines, Quarries,
Nevada County, California,
photo print
The pebbles are of quartz and various igneous rocks. Auriferous gravel (Pliocene) exposed.
Categories: Image;
Tags: Esperance Hydraulic Mine,
Mills, Mines, Quarries,
Nevada County, California,
photo print
Published as plate 1-A in U.S.
Categories: Image;
Tags: Esperance Hydraulic Mine,
Mills, Mines, Quarries,
Nevada County, California,
photo print
|
