I'm in CHGY, too and have been posting over on Yahoo that it is the most undervalued US-listed China coal stock. The pops seem to have started with Hong Kong coal stocks first, followed by the bigger US-listed firms like PUDA, then down to the medium-sized like LLEN, which had a nice pop last week.
CHGY's P/E is in the high 3s, so it should easily double this winter. Being a relatively smaller company compared to the biggest firms, some of its P/E discount could be related to investor worry about risk related to random mining accidents that could disrupt revenues moreso in a smaller company than with one that owns many mines. However, I think that outstanding low valuation, higher coal prices, and high coal demand will very soon cause a sudden run-up in PPS. I bought more CHGY a week ago when it had a one-day dip down $1.60.