UPDATE 1-Chevron-led Kazakh oil company boosts first-quarter output

ASTANA, June 1 (Reuters) - Chevron-led Tengizchevroil (TCO), Kazakhstan's No.1 oil company, increased crude output by 4.4 pct year-on-year to 7.1 million tonnes (about 56.7 million barrels) in the first quarter of this year, TCO General Director Tim Miller said on Monday.