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This would include smelter operation - i.e., how the system worked from about 1880 to 1940 or so. Would there be stockpiles of high-sulphate ores waiting to be smelted? What's in the slag? Should I be looking for exotic heavy metals like indium and thallium?
Wouldn't you just do metal scans for everything?
That is one heck of a specific topic for a text. I hope someone can come up with something for you. Best of luck.
Your comment about Superfund does give me an idea, though - there might have been some smelter sites previously remediated - Bevil Amendment or not. Perhaps I can check on some RODs and see what they came up with.