1970 Map of Boundary Cone

About this map

Boundary Cone rises as a prominent landmark in the Black Mountains of Mohave County, serving as the focal point for an area defined by its late-century mining activity. This 1970 survey records a landscape etched with the legacy of resource extraction, where numerous claims such as the United Oatman Mine, Alcyone Mine, and Black Range Mine are connected by a network of Jeep Trails. The concentration of these sites around the foothills of Wrigley Peak and McHeffy Butte illustrates the intense geological interest in the region. Beyond the shafts and tunnels of the Oatman Southern Mine and Adams Mine, the map documents modern infrastructure developments, including a prominent Pipeline and a Borrow Pit north of the volcanic heights.