Practical instructions for the determination by furnace assay of gold and silver in rocks and ores This book, "Practical instructions for the determination by furnace assay of gold and silver in rocks and ores", by E.J. Chapman, is a replication of a book originally published before 1881. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.