Admizal Nazki
Universitas Negeri Padang

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KAJIAN TEKNIS KEMAJUAN LUBANG BUKAAN YANG OPTIMAL PADA PENAMBANGAN BIJIH EMAS DI PT. DEMPO MAJU CEMERLANG KENAGARIAN TAMBANG KECAMATAN IV JURAI KABUPATEN PESISIR SELATAN PROVINSI SUMATERA BARAT RIRIN HANRIESTA BR MATONDANG; Raimon Kopa; Admizal Nazki
Journals Mining Engineering : Bina Tambang Vol 6, No 1 (2021): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v6i1.111347

Abstract

Absract. PT. Dempo Maju Cemerlang is a company focused in the gold mining industry in Indonesia. PT. Dempo Maju Cemerlang uses an underground mining system using the shrinkage method. Underground mining activities at PT. DMC is divided into two activities, namely production and development. Blasting activities play an important role in the mining cycle to unload ore or waste so that it can be taken out of the mining area. This study aims to produce openings as planned by the company with a better progress value. The success of a blasting can be judged by the results obtained. Blasting results at PT. DMC has not yet reached the progress target set by the company, namely 1.5 m / blasting. The average progress of each detonation is 1,216 m, the average actual blasting size is 20 cm, the actual blasting volume averages 4.0699 kg / m3 with an average powder factor value of 1.889 kg / ton, and the amount of explosives which is used for 22 blast holes, namely 20 kg. After designing and testing the recommended blasting geometry, the average progression value is 1.51 m, the resulting fragmentation is also better with an average size of 50 cm, an average volume of 5.0637kg / m3, an average PF value of 1.137 kg / ton, and the amount of explosives used for 22 blast holes is 15 kg. So after testing with the design geometry, an increase in the progress of the blasting hole was obtained by 0.294 m for one blasting, the volume also increased by approximately 0.9938 kg / m3, the PF value of the blasting result was smaller which meant that the fragmentation of the blasting result was more. good and there was a savings in the use of 5 kg of explosives for one front blasting.Keywords: Mine Progress, Blasting, Underground Mining, Blasting Results.
Identifikasi Bahaya, Penilaian Risiko Terhadap Keselamatan Kerja Coalgetting Di Tambang Terbuka PT. Bima Putra Abadi Citranusa Lahat, Desa Lubuk Betung, Kecamatan Merapi Selatan, Provinsi Sumatera Selatan. ANGGA YUJA WIGUNA; Fadhilah Fadhilah; Rusli HAR; Admizal Nazki
Journals Mining Engineering : Bina Tambang Vol 6, No 4 (2021): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v6i4.113690

Abstract

Abstrak. PT. Bima Putra Abadi Citranusa is a subsidiary of the Bomba Group, this company is a domestic mining company engaged in coal mining. PT. BPAC started operations in July 2020 using the open pit mining method. The accident rate at PT. Bima Putra Abadi Citranusa in 2020 were 12 accidents that occurred in September – December 2020. The data collection technique used a work activity questionnaire. The results of data collection that have been obtained from surveys at mining sites will be arranged systematically and can be used as material for analysis in seeing the level of work safety (K3) in the process of mining activities using the HIRARC method. Identification of hazards and risks 38,23% is a hazard condition that has the lowest severity there are 13 conditions contained in the process of mobilizing heavy equipment, the process of transporting coal with DT, the process of dumping in the stock rom, the pump installation process, the process of driving the LV unit. Identification of hazards and risks 35,29% is a hazard condition that has moderate severity there are 12 hazard conditions contained in the process of mobilizing heavy equipment, loading process using excavators, coal hauling process with DT, dumping process in stock rom, pump installation process, process driving the LV unit Identification of hazards and risks 14,70% is a hazard condition that has a significant severity there are 5 hazard conditions contained in the process of transporting coal with DT, the process of driving an lv unit, activities at night activities. Identification of hazards and risks of 11.76% is a hazard condition that has a high severity level, there are 4 conditions contained in the process of loading with an excavator into the DT, the process of transporting coal with the DT, the pump installation process, activities at night. Kata kunci: Coal Mining, Hazard Identification And Safety Risk Assessment, HIRARC, Hazard Potential.