Back in 2013 I photographed some of the clean up efforts at the Kennecott Copper Bingham Canyon mine just a few months after the enormous landslide that took place on April 10th of that year. The mine itself is responsible for the largest production of copper in history and also mines molybdenum, silver, and gold. This mine is 2.75 miles across and could fit more than two Sears Towers stacked on top of each other (and still not reach top!).
This slide triggered 16 mini earth quakes with magnitudes up to 5.1, and slid the land almost 3,000 feet traveling at speeds that could have exceeded 100 MPH, moving an estimated 165 million tons. Although the official cause was unknown officials knew the slide was imminent back in February because of sophisticated geotechnical-monitoring equipment.
They took as many of the precautions they could; they warned the surrounding residents, and moved all of the workers away safely from what could have been a fatal disaster. In total 17 trucks were destroyed and the slide caused a 50% decrease of production, which laid off almost 100 workers.
Kris Pankow, the associate director of the Utah Seismograph Stations said "This is really a geotechnical monitoring success story... No one was killed, and yet now we have this rich dataset to learn more about landslides."
Here are links to the story:
Download Slide Fact Sheet .PDF