Salvoldi, BG, van der Spuy, B & Wilson, S 2019, 'Optimisation of cemented aggregate backfill at New Luika Gold Mine', in AJC Paterson, AB Fourie & D Reid (eds), Proceedings of the 22nd International Conference on Paste, Thickened and Filtered Tailings
, Australian Centre for Geomechanics, Perth, pp. 437-450.
Cemented aggregate fill (CAF) and cemented rockfill (CRF) have successfully been used as a low-cost, highstrength backfill material in underground mines. The placement of the material and flowability generally limits the technology to low throughput application and smaller stope sizes if tight filling is required.
Optimisation of CAF/CRF flowability and strengths is most readily achieved by optimising the Fuller–Thompson gradation curve. CAF/CRF relies on the materials available on the mine site and the additional costs of borrow pits or additional crushing adds significant cost to a material that is usually chosen due to low cost.
This paper presents a case study of an optimisation of a CAF material by the addition of tailings in order to increase the paste fraction of the material. The main aim was to decrease the angle of repose to improve filling ability in addition to decreasing the required binder content.
Keywords: cemented aggregate fill, cemented rockfill, mine backfill, optimisation
Cordova, M, Saw, H & Villaescusa, E 2016, ‘Laboratory testing of cemented rock fill for open stope support’, Proceedings of the Seventh International Conference & Exhibition on Mass Mining, The Australian Institute of Mining and Metallurgy, Melbourne, pp. 755–762.
Fuller, W & Thompson, S 1907, ‘The laws of proportioning concrete’, Transactions of the American Society of Civil Engineers, vol. 59, pp. 67–143.
Kuganathan K 2005, ‘Rock fill in mine fill’, in Y Potvin, E Thomas & A Fourie (eds.), Handbook on Mine Fill, Australian Centre for Geomechanics, Perth, pp. 101–115.
Saw, H & Villaescusa, E 2011, ‘Characterisation of cemented rock fill materials for the Cosmos nickel mine, Western Australia’, Proceedings International Conference on Advances in Construction Materials through Science and Engineering, pp. 907–914.