August 2015 (Abandoned gold mine, USA)
The Durango and surrounding La Plata County in southern Colorado declared a state of emergency after an accidental spill of toxic wastewater from the Gold King Mine, a gold mine abandoned in 1923, contaminated the Animas River.
Source: Environment: Gold King Mine Spill Assumes Emergency Proportions
November 2015 (Samarco iron ore mine, Brazil)
Kind favor of: Buzzfeed
The toxic sludge from the Samarco dam burst reaches the Atlantic.
Kind favor of Telesurtv/Reuters
April 2015 and November 2015 (Myanmar jade mine mudslides)