MINING. BY EUGENE B. WILSON FIRST EDITION. FIRST THOUSAND. NEW YORK: JOHN WILEY & SONS. LONDON CHAPMAN & HALL LIMITED. PREFACE. THE present activity in placer mining arises from the unprecedented demand for gold. Simultaneously with this demand, new sources of supply are discovered, and obstacles which in California, at least, temporarily prevented placer mining have been satisfactorily surmounted. New and im proved machinery has been introduced, which admits a wider range of such deposits being exploited. The author here acknowledges the kindness of the Risdon Iron Company and the Mining and Scientific Press, of California; also the Scientific American, of New York, for illustrations which appear in this book. He is also indebted for information to the manufacturers whose names are inserted. The method of presenting the subject-matter, he trusts, will be of substantial benefit to those interested in placer mining. E. B. WILSON. |