You're a mile off DDxz (again) but keep researching. LOL
Rockwood coal indeed has different specifications to MCC. Comparison are new straight forward but when compared with other internationally traded PCI coals it indicates Rockwood coal fits into a suitable broad quality matrix....well that's if you want to believe the studies completed by external consultants with significant experience in this coal product type.
All I recommend you read the ASX releases rather then the ramblings of anyone on HC: