Not sure if you read the link?
Whether it's a core in Qld, Mono, or ... where-ever;
if you hit seams of coal, and the depth & size is recorded,
then one has some idea of likely pre-jorc dirt we're talking about ~ yea?
I don't believe my comparison data gives us much more info from other co's. However, comparing what CEO has found to others, has some bearing imo.
Cheers :)