Dec 31, 2016 Brown coal data excludes sub-bituminous coal. World Ranking. During 2016, Australia was the fourth largest reported producer of brown coal in the world after Germany, the Russian Federation and the United States. During 2016, Australias brown coalMongolia has substantial high quality coking coal reserves and is on track to become one of the worlds largest coal exporters. There are also substantial thermal black coal deposits as well as lower quality brown coal deposits. The scale and rate of coal developments hinge onJan 06, 2020 The Haerwusu coal mine in Inner Mongolia is the second biggest coal mine in the world, by reserves. China is also the worlds biggest producer and consumer of coal. It produced 3.55Bt of coal (46.7% of the worlds total coal production), while its coal consumption accounted for more than 50% of the worlds total in 2018.