The Art of Metals (Ores) in which is taught the true method of treating by mercury those of gold and silver: the manner of smelting them all and how they are to be refined and separated from one another / Alvaro Alonso Barba. [357 ts. leaves. 1952 translation made by Oswald Hardey Evans in Valparaiso, Chile of an 1817 reprint (in Lima) of the original Spanish version of ca.1640]
