Indonesia's coal production reached 461 million tons in 2015, a sixfold increase over the previous 15 years. This coal production grew at an average annual rate of 14 percent. The highest production ever recorded was in 2013, reaching 474 million tons.
The largest coal production area in Indonesia is Kalimantan, accounting for 93 percent of total production; the remaining 7 percent is from Sumatra. In terms of coal quality, the majority (63 percent) is mid-grade, 29 percent is low-grade, 5 percent is high-grade, and 3 percent is very high-grade.
Regarding coal resources and reserves, 2016 data from the Directorate General shows that the largest coal wealth is concentrated on two islands: Sumatra (50 percent) and Kalimantan (49.5 percent), with the remainder distributed across other islands.
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