The Tohono O’odham Nation; Pascua Yaqui Tribe; and Hopi Tribe are filing a complaint against the U.S. Army Corps of Engineers in re: the proposed Rosemont Mining Company's plans to excavate a mile-wide, half-mile deep pit to extract copper — a proposal that would spell the permanent devastation of this important center of Native American cultural and religious life, degrade the
Cienega Creek watershed, and destroy an intricate network of drainages containing some of the highest quality streams and wetland ecosystems in Arizona.

Complaint challenging the U.S. Army Corps of Engineers' approval of permit for proposed Villages at Vigneto development project that would rely solely on groundwater, draining the San Pedro River and harming millions of migratory birds, including threatened and endangered species.