The hammer mill is a machine that can be used effectively for large and small scale mineral processing. ... Dolomite, Manganese; Mica, Copper, Lead, Graphite, Quartzite, Asbestos, Iron, Granite, Silica sand, Gemstones (varieties) Kyanite, and Kaolin (Ajasa, 2014). Some of these minerals deposits are estimated to run to millions of metric tonnes ...