The history of mining in as large a territory as is embraced in Arizona is difficult to coordinate. Each district had its start, to a large extent, independently of the others. and each continued, as an isolated entity. Certain economic factors, however, govenned their growth as a whole, and these factors are shown in the suceeeding chapter on General History. The legendary mining done prior to the United States' occupation in 1849 is lightly touched. The period embraced in the following pages is virtually the eighty-year period from 1849 to 1930. In the chapters following Chapter I the history of the nine largest camps is given, followed by chapters giving a more generalized history of the smaller camps grouped areally. In the Appendix, the production records in detail are given of the camps and the individual mines.These records are as complete as possible, and the degree of error where estimates are given. is shown.