BookWebCD includes the page images and searchable text of two government reports:
California State Mining Bureau's Bulletin No. 92 (1923)
Gold Placers of California
and excerpts from the
United States Geological Survey's Bulletin No. 507 (1912)
The Mining Districts of the Western United States
Gold Placers of California, by Charles Scott Haley, was
written in the prosperous early 1920s. Hopes persisted that
private corporations would construct substantial dams on the Yuba,
Bear, and American Rivers to trap both heavy and light sediments, and
allow the resumption of hydraulic mining.
includes chapters on:
control of mining debris,
placer mining methods, and
the location and extent of the principal gold placers.
It also provides a
four-color map showing the distribution of
California's gold gravels, and a geologic
chart pertinent to the origins of the gold-bearing gravels.
The excerpts from The Mining Districts of the Western United States
include the introduction, the chapter on northern California, and
the maps locating mining districts and railroads in thirteen states: Arizona,
California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon,
South Dakota, Texas (western part), Utah, Washington, and Wyoming.