Some of them leach their waste into the ground, says Pembina, although how much is uncertain.
彭比纳研究所认为，一些尾矿池中的废水渗入地下，但渗入地下的废水量有多少尚不清楚。
2
The Pembina Institute, a local environmental think-tank, claims that a lot of the mature, fine tailings were merely transferred to other, larger lakes; Suncor says not.