It’s been more than a year since a Grupo Mexico mine spilled toxic chemicals into the Sonora River 25 miles south of the U.S. border, and health authorities are still looking for victims. Although Mexican officials claim the river is now safe, it's unclear how the lasting environmental and human impacts will unfold. The same is true in the United States as investigators continue a probe into a similar spill from a defunct gold mine in Colorado this year. Valeria Fernandez of the Arizona Center for Investigative Reporting, with support from the Corporation for Public Broadcasting, explores how the aftermath of the Mexican spill could offer a glimpse into potential dangers posed to people and the environment from thousands of mines in the U.S.

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