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Summary of Heavy Metals Studies At San Juan Ridge, Nevada County, California.

Authors
McLellan-RR
Source
NTIS: PB/226-694 Available for Reference At Bureau Libraries :87 pages
Link
NIOSHTIC No.
10010019
Abstract
The Tertiary channel gravel deposits in northern California were selected for detailed investigation by the federal Bureau of Mines as part of a national program to locate potential sources of gold that might be developed rapidly by large-scale mining operations. This report summarizes the individual investigations by five Bureau research centers representing mining and metallurgy subsystems for possible solutions to the problem areas that long have discouraged resumption of large-scale mining in the deposits, and gives conclusions and recommendations after 2 years of field work at the deposits on San Juan Ridge. The studies indicate that modern mining technology can cope with the environmental problems that closed the immense hydraulic mines in 1884. However, they also indicate that mining can be conducted with only marginal profits unless the price of gold remains substantially above $70 per ounce or unless sufficient byproducts can be recovered and sold to place the average value per cubic yard of gravel into a positive commercial range.
Publication Date
19730101
Document Type
CP;
Fiscal Year
1973
NTIS Accession No.
PB-226694
NTIS Price
A06
Identifying No.
OFR 5-74
NIOSH Division
DRC;
Source Name
NTIS: PB/226-694; Available for Reference At Bureau Libraries
State
CA; NV;
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