This is the quarry from which the Riddler's kiln was fed. It is a huge excavation and as there is very little overburden around one could assume that all of the material removed has been subject to kilning and calcined.
Otago peninsula is the remains of the rim of a volcano of age between 10 and 21 million years which erupted through an existing sea floor, carrying material with it.
And although there are a small number of small deposits of limestone in the Otago Peninsula area, this quarry material does not look, to the non-geologist, like limestone as one generally expects it to look, being grey and sandy in texture.
There is a very small band of rocks (which would have been exposed before the kiln was established) which is noted on Sheet 25 Dunedin map of the NZ Geological Map series as being Waipuna Bay formation micaceous sands and shales, calcareous sandstones and shell beds interbedded with tuff and ash beds . .
This homogeneous mix of raw materials will therefore have been quarried at this location and burnt for the manufacture, not of burnt lime for traditional mortar as has been suggested elsewhere [written accounts of the Sandymount kilns have almost always assumed that they were kilns making burnt lime- there will of course be contemporary writing about them which will have understood the difference] , but hydraulic lime - a type of cement and a valuable construction material which will set in the presence of water (underwater)
It has been assumed that other lime kilns and lime burning enterprises in Otago "shut down" once limestone had become to be exploited on Otago Peninsula - yet these two materials - hydraulic lime and ordinary burnt and slaked lime - were not competitive products each being made for different purposes and so other explanations might be needed for the demise of many other lime burning undertakings North of Dunedin.
PLEASE NOTE THAT THIS KILN IS ON PRIVATE LAND AND IS TO BE VIEWED ONLY FROM THE ROADSIDE.
UNAUTHORISED ACCESS MAY DISTURB ANIMALS ON THE PROPERTY AND THE KILN IS DEEP AND DANGEROUS AND NOT FENCED.
THERE IS ANOTHER KILN ACROSS THE ROAD ON RESERVE LAND WHICH IS BOTH LEGALY ACCESSIBLE AND SET-UP FOR PUBLIC VIEWING.
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Photo taken in Sandymount, New Zealand
Misplaced? Suggest new location