Thank you...
Wheeler, you are correct with the name and for all I know, probably the conditions as well.
The AOPA airfields directory offered this in 2000:
Heck Field QLD
WAC 3340 27deg46'S 153deg 20'E
...yada yada yada...
Runways 10/28 Grass/Gravel 700m. (RWY 18/36 Grass/Gravel due for completion mid 1998)...Navaids: VOR JCW 116.8 (500m N).
No details on Yerranderie (reference to which I couldn't find in the Aus Story archives either).