(Sharon Chischilly | The New York Times) Carletta Tilousi, left, and Stuart Chavez walk near the Pinyon Plain Mine (formerly known as Canyon Mine), located less than 10 miles from the southern rim of the Grand Canyon near Flagstaff, Arizona, April 18, 2022. The Navajo Nation recently passed new rules for the transportation of radioactive material across the reservation, following the unannounced transport of uranium ore from Pinyon Plain Mine to Utah in July.