The first publication of the Arizona Bureau of Mines on Arizona Gold Placers was written by Mr. M. A. Allen, then geologist with the Bureau, and appeared in 1922 as Bulletin 118. It was mainly a compilation of data already in print, but scattered and difficult to find. It proved to be popular, and all copies printed were distributed in four years. Mr. E. D. Wilson was then commissioned to rewrite the bulletin, completely, adding what new data could be obtained. Assisted by Mr. W. R. Hoffman in the field, and further aided by the advice and suggestions of Dr. Carl Lausen, then geologist with the Bureau, Mr. Wilson completed his work in the summer of 1927, and a large edition was published at once as Bulletin 124. Conditions with which everyone is familiar have aroused so much interest in gold that the demand for Bulletin 124 has been extremely heavy, and the supply was exhausted before June first of this year. This new bulletin has been prepared to meet the demand for information on Arizona gold placers which shows no sign of abating. 114 p.