[2] The ore body consists of calcrete coastal dunes of the Pleistocene Bridgewater Formation in a 20-kilometre (12 mi) northwest-trending depression.

The deposit may contain as much as 500-700 million tonnes over an area of 87 square kilometres (34 sq mi).

Gypsum is transported 64 kilometres (40 mi) on an isolated railway operated by Aurizon to the port of Thevenard.

[6] It is further stockpiled at Thevenard, then loaded on ships to Glebe Island in Sydney for further processing.

Originally part of the Port Lincoln Division of the South Australian Railways, the "station", comprising only a small corrugated steel waiting shed, was very rarely used because of the lack of nearby settlement.