Black coal having a relatively high volatile content. It burns with a characteristically bright smoky flame.
- Only in this region do the reserves of anthracite and bituminous coal exceed the reserves of sub-bituminous coal and lignite.
- The Tertiary coal of northern Thailand is classified according to coal rank as lignite to bituminous coal.
- This is largely due to a combination of factors including our weather, the eradication of smoky bituminous coal in many urban areas during the 1980s and the early 1990s and the introduction of unleaded petrol.
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