Includes: "Stope Map of the Dutch and Sweeney Mines. Tuolumne County, Cal. Longitudinal Section - On Slope of Vein. Compiled from data by C.W. Terry, Mining Engineer, July 1913." Map measures approx. 62x56½". Heavy canvas backed parchment. Hand drawn and possibly unique map illustrating the shaft layout of the mine. A few tears in canvas, soiling, overall very good. * "Plan of Underground Workings of Bonanza Mine. Sonora Cal. January 19 1922." Very large 3-sheet blueprint of the shafts and dollar production of the Bonanza Mine. Total approx. measurement of 3 sheets combined is 89x25". Sheets were originally taped together with cellophane tape to front which has since dried and has fallen off or is falling off, leaving tape residue between the sections. * Plan of Underground Workings of Bonanza Mine, sheet #1. This appears to be the original drawing from which sheet #1 of the above blueprint was taken. Features map of shafts, with dollar production values of gold production. Measures approx. 31x25½". Undated and untitled, but known to be circa 1922 from the above blueprint. Marked “SHEET 1” Hand drawn map on thin waxed linen. * "Plat of Survey of the Bonanza Lode Claim, Showing Relative Position of City Lots as Platted From Official Records. By C.W. Terry. July, 1916." Hand drawn map on parchment showing Bonanza Lode and surrounding area. Appears to be a map of Sonora, California. Measures approx. 24x33½". Yellowed, rough on bottom and small tear to top margin, otherwise very good. Together 4 maps.