AusIMM NZ Branch Conference 2018  • 17th–18th September • Trinity Wharf, Tauranga

Rotowaro coal mine
Maramarua coal mine

Field Trip #3: Rotowaro and Maramarua Coal Field Trip

Sunday 16 of September, full day

Registration fee: $30 ($15 for students) incl GST


A day visit to the two major coal mining sites in the North Island, Maramarua and Rotowaro, both opencast mines operated by BT Mining.

The Rotowaro Mine, with an annual production of 700 Kt, is the second largest opencast coal mine in New Zealand. It is located in an area that has had a long history of both opencast and underground mining. The coalfield was first mined in 1915 after a branch railway and a bridge were established over the Waikato River. The current opencast mine opened in 1958 and produces low ash, low sulphur thermal coal. Both the lower seam and upper seam of the moderately complex Waikato coal measures are present.


Maramarua has a long history of coal mining with an opencast mine first being developed at the site in 1948, with modest quantities extracted since that time. The current operation commenced in June 2015, with significant project capital being injected into the site infrastructure to re-establish operations. Coal mining recommenced in October 2017 and has an annual production of 150 kt. The coal produced at Maramarua has a low sulphur and ash content, making it ideal for steel production. The most significant customers for Maramarua’s coal are local dairy plants and the Glenbrook steel mill.


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