In 1929, thirty-nine mines or prospects in which gold was the element principally sought were listed by the State Mine Inspector of which four actually produced some gold. In his report for 1933, however, the official mentioned lists seventy-four such properties and over half of them produced more or less gold during the year. These facts prove that the depression, which has thrown many men out of work, and the great increase in the price of gold have created an interest in prospecting for and mining gold such as has not existed for many years. Over twenty-six hundred persons are now prospecting for placer or lode deposits of gold or operating on such deposits in Arizona, whereas less than four hundred persons were employed in gold mines in the State in 1929 and only a few score prospectors for gold were then in the field. This tremendously increased interest in gold has created a great demand for information about Arizona's gold resources, which this bulletin is intended to supply. Because Arizona has for many years produced more copper than any other state in the Union, it is not generally recognized that gold ores are widely distributed throughout the State, and it is the hope of the authors that the publication of the facts will attract more capital to Arizona for the development of her gold deposits. It is also hoped that the sections on working small gold lodes, on the laws and regulations relating to the location and retention of lode claims, and on prospecting for gold will be helpful to inexperienced prospectors.