LyondellBasell, which recently shuttered its Houston refinery, will lay off 86 percent of those facility workers—or 345 workers—on April 17, according to a filing with the Texas Workforce Commission.

Lyondell Basell Industries' will lay off 345 workers, or 86% of the workforce, at its shuttered Houston refinery on April 17, according to a filing with the Texas Workforce Commission.

The news comes a little more than a month after the Houston-based international chemical company announced that it would be closing the refinery.

After more than a century of churning out fuel on the banks of the Houston Ship Channel, the city’s oldest refinery is preparing to shut down, potentially putting hundreds of people out of work. Its competitors are welcoming its demise.

Layoffs at Lyondell Basell Industries' shuttered Houston refinery will begin in mid-April, the company stated in a letter sent to the United Steelworkers union (USW) on Monday.