The dual approach of examining the grinding media wear through a series of marked ball tests and investigating the impact of grinding chemistry on lead and zinc metallurgy using the Magotteaux Mill at MMG's Century mine (Century) has resulted in the conversion of the plant to high chrome grinding media. The consequences of this change have been positive in terms of wear, with a reduction in media consumption, and no adverse effect on either the lead or zinc metallurgy.The paper outlines the methodologies employed on the Century ore to estimate the changes in wear and metallurgy to establish if there were any advantages of advancing to plant trial. A detailed description of the marked ball test procedure, and the results obtained is given. The Magotteaux Mill test work is also described. These results were used to develop a business case for the plant to move to trial.Once Century agreed to trial high chrome grinding media, the plant was continuously monitored to ensure that the predicted changes in wear and metallurgical performance were realised. The trial data are discussed at length.CITATION:Greet, C, Obeng, D, Kinal, J and de Bosscher, P, 2013. The application of high-chrome grinding media at MMG Century Mine for improved grinding media consumption and metallurgy performance, in Proceedings MetPlant 2013 , pp 332-346 (The Australasian Institute of Mining and Metallurgy: Melbourne).