Everything you need to know about drywashing. Well illustrated with lots of pictures of unusual drywashers. Includes a section on how to sample and estimate the gold value of placer gravel. With over 50 years of experience, Jim Straight, geologist, soils engineer and instructor writes about new techniques, tips and tricks necessary for effective gold recovery in dry washing. Illustrated with tables, charts and more. 34 pages, Soft cover, 5 1/2 x 8 1/2 inches.