When the first report on the Mineral Industries of Arizona was published in 1928 as Bulletin 125, it was planned to issue such a report annually, but the Bureau found itself financially unable to carry out this idea last year, and it seems probable that a biennial review of the mineral industries of the State will serve the needs of inquirers fairly well. It is, therefore. planned to publish in the future such reports every two years. This second report is not intended to displace Bulletin 125, but, rather, to supplement and bring up to date the information presented in the first report. Persons interested in Arizona's mineral industries should possess both bulletins. Mr. Tenney's introduction to the section on copper mining and the data relating to the number of men employed by the copper companies were prepared prior to the decline in the price of copper, and it would be necessary to modify these statements considerably to make them applicable to the present situation. Since the prevailing curtailment is considered abnormal, it has been thought best not to attempt to give figures applicable to the industry at the time this bulletin goes to press. This report, then, covers the condition of the copper mining industry just prior to the curtailment of operations mentioned. 108 p.