Jasri, Aprizal, Erlinda, Febri Haswan and Amirel Hafief Agiel 2026. Development of a Machine Learning Model for Predicting River Pollution Levels Caused by Illegal Gold Mining Activities in Kuantan Singingi Regency. JURNAL TEKNOLOGI DAN OPEN SOURCE. 9, 1 (Jun. 2026), 390 - 410. DOI:https://doi.org/10.36378/jtos.v9i1.5724.