My grandfather was Daniel Galvin and he was a miner in the Hunter. His marriage cert shows he was a coal sinker. My mother said he ended up as a mine manager in the Hunter. In his probate details which I sourced recently from NSW State Archives it notes he was in receipt of compemnsation from BHP. I haven't done much about following up the mining aspect but I understand that there are union records for miners which could be useful.
I have a CD I bought some years ago which is a history of the Greta Coal Measures (1861-1998) and the Greta Coal measures Oral History Tapes which came via the Newcastle Regional Museum.
I have also on the NLA newspaper digitisation site started tagging Hunter valley mines and accidents. I would certainly be interested in any discussions about Hunter Valley mining.
Anne