hydro-metallurgical

Updated: May 14, 2025

This is a simple demonstration of a hydro-metallurgical process, though probably young hopeful is not aware of the fact; and it is really by an enlargement of this process that our beautiful and artistic gold-and silver-plated ware is produced.

J. C. F. (Joseph Colin Frances) Johnson - Getting Gold: a practical treatise for prospectors, miners and students