The Arizona Bureau of Mines receives many inquiries regarding methods for treating gold and silver ores. Due to the widespread interest in the treatment of these ores at this time, the similarity in the inquiries received, and the fact that many letters have been addressed to the Bureau by persons who desire replies in non-technical language, it was believed advisable for the Bureau to reprint Bulletin No. 133 entitled "Treating Gold Ores," published in April, 1932,for the use of persons not familiar with technical terms. It is obvious that a paper so written cannot cover the subjects included in more than a superficial manner, but it is believed that the Bureau can better serve the demand for such information by sending a bulletin rather than writing individual letters on the subject when requested to do so. 28 p.