Thu, 19 Jul 2012 12:34:34 CDT
Walkout is latest in string of problems for exporters of coal and oil -Strike has halted production at Glencore, which accounts for 15% of Colombian coal production BOGOTA--Colombian coal workers for the local unit of Glencore International PLC (GLNCY, GLEN.LN) went on strike Thursday, marking the latest in a string of protests and other problems to hit Colombia's vital coal- and oil-export...
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