I don't know the exact dates I visited this hill but I did so a number of times while working for the Forest Service at Kaingaroa Forest between 1983 and 1987. (Part of the hill was in the Waiotapu subdivision of the forest and there was a Forest Service fire lookout for spotting forest fires on top of this hill. Is it still there? There is a lot of thermal activity near the base of this hill including a hot stream and pools you can soak in.