With mining growth comes larger, deeper, more unwieldy tailings ponds, experts warn. By Andrew Nikiforuk, Today, TheTyee.ca The average height of a tailings dam has grown from 120 metres in the 1960s to 240 metres today. Image of Mount Polley tailings dam spill by Cariboo Regional Dis

Just updated to include Mount Polley from http://www.wise-uranium.org/mdaf.html(from 1960 – last updated 6 Aug 2014)  Date Location Parent company Ore type Type of Incident Release Impacts 2014, Aug. 4 Mount Polley mine, near Likely, British Columbia, Canada Imperial Metals