University of Otago School of Mines professors and students studying the rock in July 1902. Otago Witness photo.
Rodney Green, CEO Ravensdown Fertiliser, Tony McDonnell, farmer at Clarendon, Bill McLeod chairman Ravensdown Fertiliser examine the phosphate deposits earlier this month.
Clarendon farmer Tony McConnell digs into a phosphate-bearing bank on his farm.
The derelict Ewing Phosphate Company factory at Clarendon.
A close-up of phosphate from the Clarendon area.
Reopening a historic phosphate mine in South Otago could save millions for the farm fertiliser industry. Photos by Gerard O'Brien and the Otago Daily Times archives; prints available from otagoimages.co.nz.