In this study sawdust was used as reductant for sulphuric acid leaching of manganese ore. Effects of pulp density, amount of acid, temperature, particle size of ore and amount of sawdust were studied. Manganese extraction of similar to 98% was achieved under the conditions: leaching time 8 h, 5% H2SO4 (V/V), 10% pulp density, 90 degrees C and 5% sawdust (w/w), i.e. 0.5 g/g ore. Other Mn containing materials like low grade manganese ore, manganese nodule and Mn-nodule leach residues were tested and all these materials responded well giving more than 98% Mn extraction. (c) 2007 Elsevier Ltd. All rights reserved.