The water behind the tailings dam will be cleaned to better than code and discharged continuously.  So even if an 6 mile wide asteroid hits the area with the force of a 11.0 earthquake… that impact will not result in flood of water with chemicals.  Please educate yourself on redundancy and fail safe designs… and stop opposing clean mines.  

Focus your efforts on stopping ALL Chinese mines.  There is not a risk of toxins spilling from those… there is a reality… a practice of billions of tons of toxins spilled in China.  Why don't you know this.  Because the global media does not want you to know… and you are too lazy and uncommitted to find out.  But the information is on the web… Guardian, National Geographic, the Diplomat… all good sites cover the crisis.  But the horror faced there is not funded by the elites…. they want you distracted here..