PASADENA, CALIF. — Tetra Tech, Inc. signed a definitive agreement to purchase the Brazilian mining engineering practice of CRA Engenharia Ltda. The mining practice generates about US$20 million in annual revenue and is headquartered in Belo Horizonte, Brazil. Tetra Tech plans to close the transaction during the third quarter of its fiscal 2012. The terms of the acquisition were not disclosed.

“This is Tetra Tech’s first acquisition in Brazil, and it represents a significant opportunity for the Company to expand its mining service offerings to the sixth largest economy in the world,” said Dan Batrack, Tetra Tech’s Chairman and CEO. “We have again followed our large global mining clients to a new geography, and plan to continue expanding our Latin American business operations.”

The mining practice that Tetra Tech is acquiring began in Brazil in 2005 and provides EPCM services focused primarily on iron ore and precious metals clients. This transaction will add about 310 employees to Tetra Tech’s Engineering and Consulting Services business segment. In 2011, Tetra Tech acquired Metalica Consultores of Chile, which also has a small Brazilian engineering unit.