I believe Mongolia has the right munerals
“The EIA reported that China's coal consumption increased 9 percent to 3.8 billion metric tons in 2011, which was its 12th consecutive yearly increase. China now accounts for approximately 47 percent of global coal consumption. The EIA has stated that China has accounted for 82 percent of the growth in coal demand since 2000. According the International Energy Agency, China was not only the largest coal producer in 2011, accounting for roughly 46 percent of global production, but also the largest importer, importing approximately 177 million metric tons in 2011.”
A related article
https://www.scientificamerican.com/article.cfm?id=china-may-not-find-enough-coal-to-burn
Even with the potential slowdown in demand in China, Mongolia's being on it's Northern Border is well positioned to supply much of China's large coal deficit -which was estimated to be 177 million tonne during 2011. In effect Tavan Tolgoi's high rank coke and thermal coal puts Mongolia in a strong position.
All the more reason for Mongolia to power its own needs with its lignites supplying it's mine to mouth Power Plants.