The Manefay landslide at the Bingham Canyon open-pit copper mine on April 11, 2013. Also notable are the two different slides—the earlier light gray slide of pyritized Bingham Mine Formation quartz sandstones overlain by the yellow-brown, oxidized dump material which slid about 1.5 hours later. Multiple pieces of mining equipment caught up in the slide are barely visible at the toe of the slide in the lower left. Photo courtesy of Kennecott Utah Copper.

The Manefay landslide at the Bingham Canyon openpit copper mine on April 11, 2013. This view, toward the northeast, shows the landslide in its entirety with the main failure plane angling downward from the right side of the headwall scarp toward the buildings in the middle left. The slip plane is in the Manefay series beds of the Bingham Mine Formation. Also notable are the two different slides—the earlier lightgray slide of pyritized Bingham Mine Formation quartz sandstones overlain by the yellow-brown, oxidized dump material which slid about 1.5 hours later. Also apparent is the fluidity of the slide as shown by the layering in the foot of the deposit in the pit bottom. Multiple pieces of mining equipment caught up in the slide are barely visible at the toe of the slide in the lower left. Photo courtesy of Kennecott Utah Copper.