California - Gold and Silver - 1867
San Francisco Assaying and Refining Works. GOLD AND SILVER TABLES, SHOWING THE VALUE PER OUNCE TROY, AT DIFFERENT DEGREES OF FINENESS, AND THE NET RETURNS OF GOLD AND SILVER WHEN REFINED, ALSO, OTHER USEFUL TABLES APPLICABLE TO THE BUSINESS OF THE PACIFIC COAST. PREPARED BY THE SAN FRANCISCO ASSAYING AND REFINING WORKS, SUCCESSORS TO KELLOGG, HEWSTON & CO. (title page) TABLES OF THE VALUE OF GOD AND SILVER PER OUNCE TROY, AT DIFFERENT DEGREES OF FINENESS ALSO TABLES SHOWING THE NET RETURNS FROM GOLD AND SILVER OF DIFFERENT FINENESS, WHEN MADE IN COIN OR FINE METAL WITH OTHER TABLES, WHICH WILL BE FOUND USEFUL AND APPLICABLE TO THE WANTS OF THE BUSINESS OF THIS COAST. Towne & Bacon, Printers. 1867. 54 pgs. By the time of this publication, the silver mines in Nevada were active and the assaying of silver had begun to take its place alongside that of gold. This publication was an important addition to California and Nevada mining company reference materials in the 1860’s. Front hinge starting, overall in vg cond.