Analisis Rock Factor dan Pengaruh Powder Factor terhadap Fragmentasi pada Batuan Limestone di Bukit Karang Putih Pt. Semen Padang (Persero) Prima, Harifan FT UNP Yulhendra, Yulhendra Abdullah, Rijal Kopa, Raimon thesis https://repository.unp.ac.id/id/eprint/43234/ https://repository.unp.ac.id/id/eprint/43234/1/final_B1_11_HARIFAN_PRIMA_15137091_312_2018.pdf open access 2018-02 boulder fragmentasi powder factor rock factor