(Reuters). Exxon Mobil Corp (NYSE: ) stated that it met with the United Steelworkers union on Saturday to discuss terms for a labor contract. This union represents workers who are locked out at a Texas refinery.

Exxon stated that it had provided clarifications on its most recent proposal, and rejected any union-proposed changes to this offer. It claimed they would increase its costs.

Exxon explained that Union had provided a single-pager containing 24 suggested items. They requested they be included in our proposal. The majority of these items would increase the Company’s cost. Exxon also stated that the Union was not interested.

Exxon has now replaced 650 employees at its Beaumont plant in Texas with temporary workers for more than five months.

This new proposal was made at the same time that at least 30 percent of United Steelworkers workers were represented in local 13-243. They signed a petition asking the U.S. National Labor Relations Board for a vote to remove the union.

Friday was a day when the union accused the company, accusing it of mislead people by confusing statements regarding negotiations, the union and the lockout.

Exxon stated that the union had not yet indicated whether they would vote for the new offer, and that the next bargaining session was not planned.