"It is great to see that we can get back to a place where the water again runs clear. If you can clean up the Iron Mountain Mine, you can clean up anything."Yes, great! Except...
The problem is that the toxic broth will continue pouring out of the mine for 3,000 years until the pyrite is used up or someone figures out a way to neutralize the chemical and biological reactions, scientists say.My definition of "cleaned up" seems to be missing something.
The pH measurements were obtained by using the Pitzer method to define pH for calibration of glass membrane electrodes. The calibration of pH below 0.5 with glass membrane electrodes becomes strongly nonlinear but is reproducible to a pH as low as −4.In other words, they're using a "pH" scale that, in the region of interest, doesn't closely track what you'd normally call pH, but it is reproducible and they tell you what their terms mean, so it's scientifically useful. It seems kind of misleading to quote the -3.6 pH value without the context indicating that it's a specialized use.
For a typical Copper mine, one ton of waste rock can contain several pounds of copper, five ounces of zinc, three ounces of lead, and two ounces of arsenic. On average, the earth's crust has background levels of about 2 ppm of arsenic.Maybe you have a great out-of-the-box idea that's never occurred to a mining engineer about how to profitably extract these metals from the waste while continuing the cleanup with all possible speed and safety. Please let us know.
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posted by gingerbeer at 2:51 PM on September 2, 2010