You are correct Gwynnie it is the Ottery mine at Tent Hill near Emmaville NSW. Unlike your photo when we visited last year the area around the kilns is fenced. The white deposit on the bricks is arsenic trioxide which is used nowadays in treated pine.
Hellloooo... Next Hint: this place is between Launceston and Devonport!!! I am off to find the 'Edge of the World' today on the West Coast... Gwynnie see you later...
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'The self is not something one finds, it is something one creates.' - Thomas Szasz