Brown's Manual of Assaying was one of the leading assay guides for the miner and metallurgist back in the Late 1800's early 1900's. Many of the Assay methods are still used today. A copy of this book is on the shelves of most metallurgists and Assayers and referenced frequently. Covers Gold and Silver Ores, Copper Ores, Lead Ores, plus tips on spot testing ores, determination of sulfides, and minerals likely to carry gold. Lists of the principal gold, silver, copper, and lead minerals found in the US and more. This rare publication now back in print by Miningbooks.com