A procedure to improve the obtaining and separation of noble metals, free, combined or in coloidal state in plus and volcanic rocks and its secondary yaciminetes (Machine-translation by Google Translate, not legally binding)

摘要

A procedure to improve the obtaining and separation of free noble metals, combined or in colloidal state, in plutonic, volcanic rocks and their secondary deposits, characterized, because, the raw mineral, is treated by a procedure that consists of keeping the same in suspension colloidal in a liquid medium of appropriate density. (Machine-translation by Google Translate, not legally binding)