Published: Sep 02, 2012 5:14 PM EDT
Updated: Sep 03, 2012 6:31 AM EDT

PITTSBURGH (AP) - U.S. Steel and the United Steelworkers have announced tentative agreement on a three-year contract covering more than 16,000 workers at domestic facilities.

Details of the agreement reached Sunday were not announced. The union said members will vote after reviewing details over the next few weeks. The two sides had been negotiating since June on a contract to replace the existing pact, which expired Saturday.

US Steel said the talks covered employees at domestic flat-rolled and iron ore mining facilities, as well as tubular operations in Lorain, Ohio and Fairfield, Ala.

The union said health care for retirees and how best to deal with the rising cost of that coverage was one of the most significant issues.

Talks continue between the union and two other companies, ArcelorMittal and Cliffs Natural Resources.