Coal is a cheap and abundant natural resource. Coal is generally used as a fuel for steam power plants (PLTU). Total world coal reserves in 2017 reached 1.035 trillion tons consisting of 718.3 billion tons of anthracite and bituminous coal types and 316.7 billion tons of sub-bituminous and lignite coal [1] . America, Russia, China and Australia are the countries that have the most coal reserves compared to other countries. However, Russian coal production is smaller than countries that have less coal reserves such as India and Indonesia as shown in Table 1. >>>
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