Colombia produced 47.3Mt of coal in the first half of 2014, a 14% year-on-year increase, according to the national mining agency (ANM).
About 91% of coal production was exported, the agency said in a statement. Colombia, Latin America's largest coal producer, turned out 40.5Mt in the first half of 2013.
The growth came despite shutdowns of operations at Drummond and Colombian Natural Resources and strikes at both Drummond and Cerrejón, the country's biggest coal miners. Contract maintenance workers held a stoppage in July, while contract security workers staged a blockade of Cerrejón's railway in June and July.
Total output of precious metals fell 13% to 33t (1.06Moz) in the first half from 38t a year earlier, the agency said. Gold production totaled 12.6t in the second quarter, adding to 13.8t reported in the first quarter. The agency did not report silver and platinum production separately.
Emerald exports fell 41% to US$26.6mn in the second quarter from US$44.9mn the previous year, according to the agency.