“PEMETAAN KLASIFIKASI ROCK QUALITY DESIGNATION (RQD) TAMBANG BAWAH TANAH ‘DMLZ’ PT.FREEPORT INDONESIA”. Jurnal Teknik AMATA, vol. 2, no. 1, June 2021, pp. 14-16, https://doi.org/10.55334/jtam.v2i1.121.