The first co-ordinates will lead to an information point beside the river. Here you'll find two signs and a plaque with all the information that you need to lead you to the actual cache location.
Fill in the gaps
S45.15.BC E169.23.4DA
A = What year was the Historic Places Act created? 199?
B = find the requested contribution per family to walk on the Roxburgh Gorge Trail and then subtract 3. This will give you a two figure amount for 'B'
C = what years did Jeremiah Drummey build the bridge over 18?9-82
D = how much was the contruction contract valued at? £1?,111