1957 Map of Dos Lomas

About this map

Poison Canyon Mine and the surrounding cluster of uranium-era operations define the industrial character of this landscape at the edge of the Cibola National Forest. The map documents a rugged terrain dominated by Mesa Montanosa and La Jara Mesa, where deep canyons like Poison Canyon served as the primary conduits for mineral extraction. While mining dominates the northern and southern slopes, traditional land use persists at the Rancho del Puerto and Roundy Ranch. A notable marginal note mentions that certain land lines in the northwest were omitted due to alleged fraud or defects in earlier surveys, reflecting the complex history of western land claims. The transition from Navajo Indian Land to the national forest is marked by high mesas and seasonal drainages like Arroyo del Puerto and San Mateo Creek.