Sherwood, A.M. 1984 Taranaki coal region : a summary. Lower Hutt: New Zealand Geological Survey. Report NZGS 112 49 p.
Abstract: Taranaki Coal Region is the area south of Te Kuiti and west of the Central Volcanic Plateau, where coal measures are of Miocene age. A total of 3.5 million tonnes has been mined from the Mokau, Aria, Waitewhena, Ohura, Tangarakau and Retaruke coalfields, but only Mokau and Waitewhena have producing mines. Current coal-in-ground estimates total 174 million tonnes indicated and 20 million tonnes inferred, almost all of which is in the Mokau and Waitewhena coalfields. Additional quantities of coal can be expected at increasing depth down-dip from known coalfields, mainly from Mokau and Tangarakau. The coal measures are characterised by extensive, thin seams, usually 1 to 2 m thick, that are virtually undisturbed by folding, and generally dip at about 50 to the southwest. Normal faults appear to only occasionally exceed 30 m in throw. The coal is of sub-bituminous rank and mainly of low to medium ash and medium to high sulphur. Taranaki Coal Region contains the second-largest sub-bituminous coal resource in New Zealand after the Waikato Coal Region.