Mine Subsidence

Carnegie Library of Pittsburgh collection

When Emily Eckel moved to Knoxville, a neighborhood south of downtown Pittsburgh, she was told to buy special subsidence insurance, just in case the abandoned coal mine beneath her house ever caved in. She'd never heard of it.

“I just started imagining this vast maze of coal mines under the city," she said. "I was picturing coal miners going in with a pickaxe or a shovel and a yellow canary and a cage and mining all day. I don’t know if it was like that, and I would like to know.” 

It was not exactly like that, at least not in Pittsburgh.

PA DEP

Nearly 90 percent of Pleasant Hills sits above old mines. So, the state Department of Environmental Protection is sending mine subsidence insurance (MSI) reminders to about 2,000 property owners in the borough.

The fliers show each recipient’s property on a map in relation to the nearest abandoned mines and urge residents to apply online for MSI, with coverage ranging from $5,000 to $500,000.

Pleasant Hills will be the first municipality to receive the mailers, according to DEP spokesman John Poister.

Of the 1 million homes in Pennsylvania that sit above underground mines, one in 2,000 insured buildings are damaged by mine subsidence, costing an average of $50,000 per structure.

That’s according to the Pennsylvania Department of Environmental Protection (DEP), which has launched an underground Mine Map Atlas, an online mapping system that allows the public to view underground mines across the state.