If you research Ogilvie's Hillyou'll find some info on Trove etc.
There was specimen gold found, some gold bearing reefs & a shaft sunk but I don't believe it was ever in a quantity good enough to be commercially viable as a mine.
There was also small quantities of gold found in the Hunter River (I assume nearby to Ogilvie's Hillwhich led to the reef discovery?).
There is now a TSR (Travelling Stock Reserve) on the highway called Ogilvie's HillTSR but I'm not sure if this is the site of the finds & shaft? To do some fossicking/prospecting there you would need to get onto the nearest branch of Local Land Services for permission.
Unless you find a coal outcrop there I don't think you'll worry the EL holders (all coal exploration).