Two well-researched and well-written books that give a good perspective on Western precious-metals mining & milling:
Western Mining: An Informal Account of Precious-Metals Prospecting, Placering, Lode Mining, and Milling on the American Frontier from Spanish Times to 1893
by Otis E. Young, published by Univ. of Oklahoma Press, 1970.
Abebooks has used copies from $6.31: [
www.abebooks.com]
and the companion volume
Black Powder and Hand Steel, Miners and Machines on the Old Western Frontier
by Otis E. Young, published by Univ. of Oklahoma Press, 1976.
Abebooks has used copies from $7.50: [
www.abebooks.com]
Highly recommended! - Doug Debs