That being said Australia appears to be the world's largest producer of bituminous coal which is considered "higher-quality" than brown coal. Low ash, sulphur, and carbonate coal is ideal for power generation as it results in less boiler slag. My guess is power generation plants require consistent quality of coal, and therefore if China power plants have only access to brown coal, that could pose a problem.

Statistics (Blocked behind paywall, but can inspect element and remove blur filter) https://knoema.com/atlas/topics/Energy/Coal/Production-of-bi...