WASHINGTON, April 3 (Reuters) - The U.S. on Wednesday

asked the Mexican government to conduct a review based on a U.S.

finding that workers' rights were denied at Industrias Penoles'

Tizapa mine, the U.S. Labor Department and the U.S.

Trade Representative's office said.

The U.S. agencies said the request under the USMCA trade

pact follows a March 4 petition filed by the Los Mineros labor

union alleging Industrias Peñoles violated workers' freedom of

association and collective bargaining rights at the company's

Tizapa mine in Zacazonapan.