Coals in the Paparoa Mine area have dry ash-free volatile contents ranging from 16% to 30%. Swelling properties are related primarily to voltaile content. The reserves of coal are considered in two groups, that of consistently exceptionally high-swelling coal with volatile contents over 21% (swelling numbers of 9+ to 9 + + +) and that of inconsistently-high to low-swelling coal with volatile contents less than 21% (swelling numbers of 1 to 9). Reserves of the former, from all nearby areas regardless of access problems, amount to 480,000 tons of measured and 425,000 tons of indicated recoverable coal. Reserves of the latter amount to 125,-000 tons of measured and 620,000 tons of indicated coal. Inferred reserves, entirely of consistently exceptionally high-swelling coal, amount to 1,800,000 tons, but much costly prospecting is essential to prove or disprove these reserves. Although the extreme north-east of the Mount Davy Block, which contains inferred recoverable reserves of 10 million tons of exceptionally high-swelling coal, is close to the southeast of the Paparoa Mine area, mining access would be most convenient from the west, and the 150,000 tons of indicated coal on its eastern margin are not incorporated in the estimates for the Paparoa area.