Suriyanto Bakri et al. 2025. Effect of Drum Rotation Speed on Magnetic Separation Efficiency for Iron Grade Improvement of Galesong Beach Iron Sand Takalar Regency. Cognitia : International Engineering Journal. 1, 2 (Aug. 2025), 77–83. DOI:https://doi.org/10.63288/ciej.v1i2.9.