During ww2 the Lithgow small arms factory produced weapons and ammunition for the war effort. To defend the town against air attack the military placed guns and barracked soldiers on an overlooking hill.
This cache is set in the area of the barracks and gun emplacements.
You will have to spend some time on a short tour to obtain the information to find the cache.
The soldiers were housed in wooden barracks that were bulldozed at the end of the war, the foundations can still be seen as piles of concrete. One structure escaped the bulldozing and stands to this day. The waypoint is that of the structure,lovingly handcrafted by the soldiers of long ago.
Unfortunatly someone has decided to fence off this remarkable piece of engineering so I have removed the first waypoint and replaced it with what was once the second waypoint so, rather than count, you can make a note that A, in this case, is one less than half C.
Find the entrance door and count the number of rows of the objects that make up the wall. Your count could be odd or even, depending on where you count. You will have a better chance of success with the even number. Call this number A.
Proceed to S33 29.108 E150 11.435, where you will find another structure, disimiliar to the first. At the NNE end of this structure there is a roofless room accessed by a small staircase, enter this room and count the number of walls, call this number B.
While you are there take note of the number of rusted bolts protruding from the walls, call this number C
The cache is at S33 29.(b-a-1)0(c/2)-a E150 11.A4(a-1).
Its container seemed fitting for the location.
Alhough I haven't found any, there have been reports of open mine shafts in the area so keep an eye open.