To assess the potential environmental contamination in this region, the authors measured the concentration of Cu, As, Cd, Zn and Hg in samples of stream and mine waters, stream sediments, soils, flotation tailings, and mine wastes in the Andacollo (Cu, Au, Hg) and Punitaqui (Cu Au, Hg) districts.
"For my entire life, I've seen the impact of long-wall mining on streams," she said.
It has left a sad legacy of abandoned mines, poisoned streams and damaged landscapes throughout the West.
But companies that mine the stream of tweets for marketing and other purposes (see article in this week's issue of The Economist) get much more information.
The Bush administration approved regulations late today that will allow coal companies to dump leftover dirt and rock from mountaintop mining into streams and valleys.
[A8.] Bush Approves Mining Regulation The Bush administration has approved regulations that will allow coal companies to dump leftover dirt and rock from mountaintop mining into streams and valleys.
The judge, Joseph R. Goodwin of Federal District Court in Charleston, ruled that the procedure, called a nationwide permit, improperly bypasses the requirement that the impact of mining on streams be determined "before, not after" such a permit is granted.
Among the many challenges related to mining data streams, change detection is one topic frequently addressed.
Third party clients are mining realtime streams to identify and target valuable groups based on their anonymous shared behavior.
A common requirement in the task of mining data streams is the ability to distinguish the useful information from the useless ones.
