21.   Some mines again were forced to treat low grade stockpiled ore when open pits became too wet and muddy to work.

22.   The image I ordered, from Terraserver, is of the Bingham Pit near Salt Lake City, the second-largest open pit copper mine in the world.

23.   The mine will be developed as an open pit.

24.   The lower output was the result of lower grades from the two open pits and a lower tonnage of ore from underground.

25.   The mines will no longer create open pits that will eventually fill with water and become sterile or contaminated lakes.

26.   The new mine would be underground, with less impact on the environment than open pit mines.

27.   The plant now treats ore from the Golden Crown underground mine, nearby open pits and the former Big Bell stockpiles.

28.   The rebels took over the huge open pit coal mine last week and kidnapped several Serb mine workers, halting all mine production.

29.   The tribes say the two huge open pits in the area have poisoned wells, have diminished the flow of streams and may have widely contaminated groundwater.

30.   There is growing use of imported coal, including American coal, which is mined in open pits and is cheaper.