Praze ine has virually no references.
1821 Joseph Carne wrote of Praze Tin Mine " here, at the depth of 20 fathoms under high water mark, a level has been driven about twenty fathoms in length under the sea. This mine, however, has not been wrought for more than forty years; I am therefore obliged to dismiss it with this short notice. The mines already mentioned are all in slate; and the small quantity of water which is found in them proves the superior compactness of this slate, as well as of the veins which it contains, to the killas and the veins of most other parts of Cornwall."
St Just Area Mines, Cornwall