"Placer Examination Principles and Practices" is a timeless classic published originally by the US Bureau of Land Management as Techniacal Bulletin 4. This classic text covers the examination of all types of Placer Deposits in order to determine the viability of mining them. Some of the things covered are the Geology, Types of Placer Deposits, Sampling Methods from panning up to using bulldozers , Equipment including Exploration and Drilling equipment, Assaying Placers and more. Now back in Print by Miningbooks.com