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2023. MODIFICATION OF HAND AUGER DRILL BIT MADE FROM USED CAR SPRINGS FOR ALLUVIAL SAMPLING ACTIVITIES IN KETAPANG DISTRICT. JUMPE : Journal of Mining, Mineral Processing, and Energy. 1, 01 (Dec. 2023), 9–13. DOI:https://doi.org/10.54866/jumpe.v1i01.1257.