Evaluating the application of the Optima® classifier as a secondary beneficiation stage at the Phola Coal Processing PlantKarabo Malekutu, Franco van de Venter, Yorkabel Fedai, Mpho Ramudzwagi, Luke Venkatesan and Michael PhaliMATEC Web Conf., 416 (2025) 05002DOI: https://doi.org/10.1051/matecconf/202541605002