Brown, I.R. 1977 Laboratory testing of core from Sullivan mine, Denniston. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 286 15 p.
Abstract: At the request of N.Z. Mines Department, logging and strength tests were carried out on drill cores from the Sullivan Mine area to assess the cutability of the coal measure rocks. A number of the rocks tested had strengths higher than the reputed capability of the Joy Continuous Miner (strength