In my experience, "ores" from different places being run through a mill might be a violation of their environmental permits. Different ores have different heavy metal contaminants that end up in the tailings. If the permits were based on a particular set of contaminants.....and someone runs new ores from a new mining district.....you might be introducing something new to the tailings (like mercury, or arsenic for example).
That's the problem with the idea of a "custom mill" that so many scammers like to promote. Here in Arizona, the rules for permitting mining facilities are based on the geochem analysis of the ores they are going to process. Adding new ores changes the equation and violates the permits.
Wouldn't be surprised if it is the same for the permitting that regulates the Bishop Mill.
Rodeo....you should contact the County Water Quality Control Board, tell them that new ores are now being processed at the Bishop Mill and see what they say. Maybe it's okay......maybe it's not. You'd want them to obey the regulations, right?
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