Preliminary report on the geology and gold mineralization of the Gold Basin-Lost Basin mining districts, Mohave County, Arizona [microform] / by Ted G. Theodore, Will N. Blair, and J. Thomas Nash ; with a section on K-Ar chronology of mineralization and igneous activity by Edwin H. McKee and Implications of the compositions of lode and placer gold by J.C. Antweiller and W.L. Campbell ; United States Department of the Interior, Geological Survey