MEXICO CITY, April 15 (Reuters) -

Bank of Mexico Deputy Governor Jonathan Heath said in an El Pais newspaper interview published on Monday that inflation in Latin America's No. 2 economy, despite having eased, was showing signs of persistence and that "difficult terrain" lay ahead.

"We are entering the most difficult terrain, in which we must be more enduring and more patient," Heath said.

A strong Mexican economy has played a role in the persistence of high prices, Heath added, noting that a further increase to the minimum wage would begin to push up average wages.

Expansive fiscal policy by the government in the run-up to general elections was complicating the Bank of Mexico's work in taming inflation this year, Heath said. The government of President Andres Manuel Lopez Obrador has looked to finish several flagship projects ahead of presidential elections this June. (Reporting by Anthony Esposito and Ana Isabel Martinez; Writing by Sarah Morland; Editing by Marguerita Choy)