Jim Tittle, whose parents live near the proposed silica sand mine in Goodhue County, sent a link to this simple Youtube:
The caption:
Does dust from frac sand mines pose a hazard to neighbors? Despite precautions, open pit silica mining causes several kinds of dust. The visible dust can be harmful, but cancer-causing silica dust is almost invisible, and it stays in the air much longer. Symptoms of illness may take years to appear.
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