Ann: Acquisition of Moranbah Project, page-94

The mines have no rights to the gas and typically have a lot of difficulties working with Arrow, particularly getting maps and information from them. Pre-drainage is completed years in advance to the longwall operations, and there is minimal cross over between Arrow and Anglo (I can't comment on other companies). The only cross over is Anglo required Arrow to confirm accuracy of drainage holes prior to mining through them.
And a lot of these operations have significant (and increasing) requirements to drain gas and significant life of mine ahead of them.
Moranbah North and Grosvenor being the two key ones that come to mind, both of which have a lot of gas left to drain and a long life planned. Keep in mind Grosvenor had the explosion a few years ago due to insufficient pre-drainage and have only increased their requirements to reduce gas levels prior to production at locations. On a side comment, all these operations are Met Coal.