Mining historian Kerby Jackson introduces us to a classic lode mining work in this important re-issue of Bulletin 20, otherwise known as "Prospecting and Developing A Small Mine." Unavailable since the 1960's, this publication was originally compiled by the Idaho Bureau of Mines and includes time tested methods for testing and developing small underground gold and silver mines. Topics covered include information on types of mining claims, how to properly locate a mining claim on the ground, the classification of varying ores, how to take a proper ore sample, the proper reduction of ore samples, alluvial sampling, how to understand geology as it is applied to prospecting and mining, prospecting procedures, methods of ore treatment, the application of drilling and blasting in a small mine, types of underground support and other topics that the small scale miner will find of benefit. This volume also includes four illustrations and fifteen tables that greatly enhance the practical usability of the information contained in this small book on mine development. Note: This edition is a perfect facsimile of the original edition and is not set in a modern typeface. As such, some type characters and photographs might suffer from slight imperfections or minor shadows in the page background.