KARAKTERISASI KANDUNGAN MINERAL PADA SISA HASIL PENGOLAHAN TB PRIMER BATU BESI PT TIMAH Tbk. SNPPM [Internet]. 2025 Dec. 29 [cited 2026 Apr. 10];9:7-11. Available from: https://journal.ubb.ac.id/index.php/snppm/article/view/7317