Neiswonger Construction Inc., which operates the Maggie Lynn limestone quarry in Washington County, is hoping to start extracting the rock underneath it.
The company is proposing to build an underground mine that would stretch for 337 acres in Deemston Borough, roughly the area of Schenley Park.
It might take 30 years to extract all that rock, cranking out 250,000 tons of limestone a year, as the mine is initially slated to produce. Or, if demand is robust enough, Neiswonger said in its environmental permit application that things could move much faster, ramping up to 900,000 tons a year.
Read the full story in the Pittsburgh Post-Gazette.