July 12 (Reuters) - Gran Colombia Gold Corp GCM.TO
* Gran Colombia steadily improving gold production with a 22% increase in the first half of 2017 to a total of 85,083 ounces
* Gran Colombia Gold Corp - company expects Marmato's annual gold production for 2017 will range between 24,000 and 26,000 ounces
* Produced a total of 16,258 ounces of gold in month of June, bringing total for Q2 to 46,075 ounces, up 21% Source text for Eikon: ID:nMKWbSZfka Further company coverage: GCM.TO