Wright, M.S.; Deely, J.M.; Coyle, S.; Sewell, R.J.; Brown, L.J. 1989 Sheet QM380 Canterbury : geological resource map of New Zealand 1:250,000. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report M 175. 32 p.
Abstract: Except for traces of copper and manganese in Torlesse Supergroup, the geological resources of Sheet QM 380 are all non-metallic. Coal, once an important commodity, was mined for many years principally from Broken River Formation in the Malvern Hills Coalfield until competition from West Coast coal eventually led to cessation of production in 1986. The most valuable resources are unlimited supplies of aggregate and limestone which are quarried from Quaternary gravels of the Canterbury plains and Amuri Limestone respectively. Small quantities of clay, sand, and bentonite from the Tertiary succession are used regularly by local industry, and from time to time building stone is quarried on Banks Peninsula according to demand. Diatomite has been noted in several localities but is of no economic significance. Although several oil and gas shows have been reported in Sheet QM 380, the area has low potential for significant reserves of hydrocarbons.