Maynardi DIM, Pratiwi DA, Trianda S, Isnawan D. ESTIMATION OF COAL RESOURCES FOR SEAM S3 AND SEAM S4 USING THE DONUT POLYGON METHOD IN THE SERONGGA AREA, TANAH BUMBU REGENCY, SOUTH KALIMANTAN PROVINCE. Journal Technology of Civil, Electrical, Mechanical, Geology, Mining, and Urban Design [Internet]. 2025Nov.28 [cited 2026Jun.5];10(2). Available from: https://journal.itny.ac.id/index.php/krvtk/article/view/6405