Wyss, R.J.; Williams, A.L.; Christie, A.B.; Brown, L.J. 1990 Sheet QM 260 Kaitaia : geological resource map of New Zealand 1:250 000. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report M 176. 44 p.
Abstract: Aggregate is produced in the Kaitaia sheet area on an as-needed basis by Hobson, Hokianga, and Mangonui County Councils, and by companies and private operators. Basalt is the main rock type extracted, the major use being roading. Limestone is widespread, commonly with little overburden, and is extracted mainly for use as agricultural lime, and to a lesser extent, aggregate for secondary roads and farm tracks. Small quantities of red chert have been quarried from Tangihua Complex for use as dimension stone. Kauri gum was extracted from many areas during the 1800s and early 1900s. Some 285 million cubic metres of peat are present near Sweetwater, 8 km west of Kaitaia. Unsuccessful attempts have been made to mine peat near Kaimaumau to extract resins and waxes, the most recent being that of Kaurex in 1985-1987. Lignite is present and interbedded with Quaternary dune sand deposits in the Aupouri Tombolo and along the southwest coast. Four onshore petroleum exploration wells have failed to find commercial hydrocarbon deposits, but there is potential for further onshore and offshore work.Exploration for metallic minerals, especially copper, has identified several geochemical anomalies and some minor copper mineralisation. Antimony and cinnabar have been reported at Takahue.Marine phosphate deposits have been located offshore on the southern flank of the Hokianga Terrace in water depths of 500 to 600 m.Cold soda springs are present in the southwest of the sheet area.