April 16 (Reuters) - Canadian miner Barrick Gold said on Tuesday that its gold and copper production fell sequentially in the first-quarter, hurt by lower grades and maintenance at its mines.

The company reported a total preliminary output of 940,000 ounces of gold and 40,000 tonnes of copper in the three months ended March 31, down from 1.05 million ounces of gold and 113 million pounds of copper in the previous quarter. (Reporting by Vallari Srivastava in Bengaluru; Editing by Tasim Zahid)