The PRC performs 46% of global coal production. Global coal reserves are estimated at 910 x 10^9 tons in 2006. Should current rates of production last then this is enough for 150 years.
Only 16% of the PRC’s coal enters international trade; the rest is consumed domestically.
Coal is used for iron and steel in industry.
It is easiest to find in anticlines, which are in strata which have become folded over time (essentially forming waves).