Raspberry Gully today is a small public reserve in Adamstown, you can ride your bike through, the kids can play on the playground. For many years in the past century however, the area was heavily mined for coal. Mining operations in the area founded a small settlement nearby - named after Charles Smith, the manager of the Waratah Coal Company in the 1870s, it was called Charlestown.
A more comprehensive account of the operations here can be found at https://en.wikipedia.org/wiki/South_Waratah_Colliery for those interested.
The published coordinates will take you to a plaque commemorating the South Waratah Colliery that operated in the area. The cache can be found over in Raspberry Gully, perhaps in an old mine cutting?
The plaque details some history of the South Waratah Colliery here - in the body of the text are 5 different years mentioned, and a number.
The cache can be found at S32° 57.ABC E151° 41.DEF.
A= the digital root* of the second mentioned year
B= the first digit in the first mentioned year
C= the difference between the first two digits of the number of employees
D= the third digit in the fourth mentioned year
E= the third digit in the last mentioned year
F= the last digit in the first mentioned year
Checksum S24 E29
*If you don't know how to calculate a digital root:
Add the digits of the number together - ie for the year 2023, the digital root is 7. If the number you get has more than one digit, add them together - ie for 1788, you'll get 24, adding these gives 6 - so the digital root of 1788 is 6. This is used in a lot of puzzles, and is worth remembering...
Watch your footing at GZ, stay high. The cache is a regular, a bit over 2L in volume.