Oglebay Norton Co. has rescheduled its third quarter earnings announcement release date from Monday, October 21, to Monday, October 28, before the market opens. The company has also rescheduled its third quarter earnings conference call and webcast to 2:00 p.m. (Eastern Time) on Monday, October 28. A replay of the conference call will be available from 4:00 p.m. on October 28 until 8:00 p.m. on November 11. The conference call will be accessible live via webcast on the company's web site at http://www.oglebaynorton.com , and a replay of the webcast will be available until November 11.