Lake Gairdner is a large endorheic salt lake in the Australian state of South Australia, to the north of the Eyre Peninsula. When in flood, the lake is considered the third largest salt lake in Australia.
Lake Gairdner is located about 440 kilometres northwest of the state capital of Adelaide and about 150 kilometres northwest of Port Augusta in the foothills on the northern side of the Gawler Ranges and to the west of Lake Torrens.
The lake is over 160 km long and 48 km across with salt over 1.2 metres (3 ft 11 in) thick in some places.
Lake Gairdner was named by the Governor of South Australia, Richard MacDonnell in October 1857 after Gordon Gairdner, a Chief Clerk of the Australian Department in the Colonial Office.
You will be looking for a non magnetic mint tin placed in the uprights along the Mannum pipline no need to climb under or over the pipe as the cache can be easily found on approach.