Madonna, James A., ‘Precious Metal Recovery Using Sluice Boxes in Alaska and Canada’, School of Mineral Engineering, University of Alaska, Fairbanks, (1988). Tourtelot, Harry A., ‘Hydraulic Equivalence of Grains of Quartz and Heavier Minerals, and Implications for the Study of Placers’, U.S. Geological Survey Professional paper, (1968).
NEW HAMPSHIRE'S LOST SILVER MADONNA . Re: NEW HAMPSHIRE'S LOST SILVER MADONNA Yes, thanks. I'm only 10 minutes from Portsmouth (and know where Smith's pond is too) so I'll have to look into that. Unfortunately there is a LOT of Portsmouth and the surrounding area that are either off limits over over-developed. I'm a couple of hours from the locale in the first article. How old is this book you ...
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