Lignite is the lowest rank of coal, often referred to as brown coal, used almost exclusively as fuel for steam-electric power generation. It is brownish-black and has a high inherent moisture content, sometimes as high as 45 percent The heat content of lignite ranges from 9 to 17 million Btu per ton on a moist, mineral-matter-free basis. Production data include quantities extracted from surface and underground mines, and normally exclude wastes removed at mines or associated reparation plants.
| 日付 | 値 | 変更 , % |
|---|---|---|
| 2022 | 15,038 | -4.08% |
| 2021 | 15,677 | 7.32% |
| 2020 | 14,607 | -5.87% |
| 2019 | 15,518 | -5.21% |
| 2018 | 16,372 | -8.65% |
| 2017 | 17,922 | -4.24% |
| 2016 | 18,716 | 12.07% |
| 2015 | 16,701 | -15.74% |
| 2014 | 19,821 | -0.71% |
| 2013 | 19,964 | 0.25% |
| 2012 | 19,915 | -15.29% |
| 2011 | 23,509 |