Most bolts are bash-ins, and now 25-30 years old. Please consider contributing to rebolting.
30-40 mins walk. Walk across the causeway (usually ankle deep - take shoes off) then follow the nicely graded road up the hill for 5 minutes. Above a left turn switchback there's a big tank, from here you can either leave the road and head R and blast up the hill for 5 mins until you reach the old rail-line ("A"). Alternatively at the tank you can keep following the road left and up the hill at an easier angle to reach the old rail line at the Old Coach Road junction, from where it's an easy flat 500m walk back R (west) along the rail line to point "A". Whichver way you went, from "A" head west along the old rail line for about 300m, crossing a gully with an old railway bridge embankment. About 150m past the gully, look for a climbers' trail which blasts steeply uphill for another 10 mins or so to the crag. You arrive at the left (east) end of the crag, turn R for 100m to the main wall.
For a "trad" crag this cliff has been surprisingly over-equipped with bolted rap chains. When nearing the top of most routes keep your eyes open and there will usually be a rap chain (or three) nearby. If you do need to top out and can't find a good rap point, the cliff gets smaller at the right (west) end, you don't need to go far before there are ample trees to get you down even if you only have one rope and need to do multiple raps.
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Check out what is happening in Coal Mines Cliff.