In a Feb. 13, 2012 file photo, a truck dumps a load of silica sand at Modern Transport Rail loading terminal in Winona, Minn. In a first-ever hearing Tuesday, critics of the region's silica sand mining industry will tell Minnesota lawmakers to hit the pause button as activists who have chartered two buses from southeastern Minnesota go to the Capitol for the joint hearing before the Senate and House environment committees. (AP Photo/The Winona Daily News, Andrew Link,File)
Read the article: Minnesota lawmakers to take up silica sand mining boom
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