Watson, Cole, Grindle & Watson
Method of treating silicate ore containing gold and silver
 A silicate ore containing gold and silver is melted with the slag from a copper converter and a reducing agent. A source of CaO may also be added to the slag so that the treated slag may contain at least 3.0% by weight of CaO. Copper is recovered from the slag and absorbs gold and silver from the ore. This method drastically improves the capacity for the treatment of a silicate ore containing gold and silver during the smelting of copper. It enables the complete melting of the ore without leaving any ore undissolved. 
Sumitomo Metal Mining Company Limited
C C
C22B C22B
inventional inventional
Yoshiaki Takayoshi Seiichi
Mori Kimura Tsuyuguchi