The Seventy Nine mine area is in the southwest corner of Gila County, Arizona (Fig. I) in the Banner mining district, a triangular area in Gila County bounded on the southeast by the Gila River, on the north by the Dripping Spring Valley and on the southwest by the Gila-Pinal county boundaries. The Christmas mine, four miles east of the Seventy Nine mine, has been the largest operation in the Banner Mining District. Referred to the Gila and Salt River Base Line and Meridian, this report describes all of sections 21, 22, 27, 28, and parts of sections 14, 15, 16, 23, 26, 33, 34 and 35 of Township four South, Range 15 East.