Practical Gold-Mining: a comprehensive treatise on ... gold-bearing gravels, rocks and ores, and the methods by which the gold is extracted ... With ... plates, etc. [With a bibliography
A technical handbook on gold extraction by Charles George Warnford Lock, published in London by E. & F. N. Spon in 1889 for mining engineers, mill operators and prospectors working alluvial gravels and quartz ores. The 241 figures are hatched line engravings of machinery shown in plan, section and elevation with letter keys and shaded ground lines: stamp mortars, amalgamators, settling troughs, water turbines and crushing frames, offering diagram-style mechanical forms and cutaway views.
