Kear, D.; Petty, D.R. 1976 Waikato coalfields : Glen Massey Coalfield. Scale 1:15,840. Wellington: Department of Scientific and Industrial Research. Miscellaneous series map / New Zealand Geological Survey 7 & 8 2 fold. maps + 1 booklet
Abstract: The Glen Massey Coalfield is located in hilly country, S of the Rotowaro Coalfield, and 8 km (5 miles) W of Ngaruawahia. Coal was first found in 1908. Since 1914, over 3 000 000 tonnes of coal have been extracted from underground mines, largely the Waipa and Wilton, and over 300 000 tonnes won from opencast pits. Although the Kupakupa, Renown, and Kemps Seams are all present, only the Kupakupa Seam has been worked to any extent, and the others are unlikely to be worked in the future. In known areas the Kupakupa Seam is almost exhausted, with reserves estimated at less than 40 000 tonnes of coal, although some 2 000 000 tonnes of underground coal may be present in a concealed northern area, and over 1 000 000 tonnes of coal, some perhaps at opencase depths, is classed as ''sub-economic'' or ''hypothetical'' in and beyond the old Waipa Mine. ... The coalfield has a relatively simple structure. The beds, ranging from Waikato Coal Measures to Waitemata Group, lie within a graben and dip gently N or NW. Major faults strike N or NNW, while minor faults strike NE.
