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Oktarinasari, E.
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PENERAPAN PROGRAM CORPORATE SOCIAL RESPONSIBILITY PADA PERUSAHAAN TAMBANG BATUBARA PT. X DI KABUPATEN LAHAT Oktarinasari, E.; Yusuf, M.; Arief, T.
Jurnal Pertambangan Vol. 5 No. 1 (2021): Februari 2021
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v5i1.20

Abstract

Kegiatan industri pertambangan selalu dikaitkan dengan corporate sosial responsibility terhadap masyarakat di sekitar penambangan. Program CSR ini dalam penerapannya di dunia pertambangan terdiri dari lima aspek yaitu hubungan komunitas, pemberdayaan masyarakat, pengembangan struktur, bencana alam dan lingkungan, serta aspek operasional. PT.X adalah perusahaan yang telah melaksanakan program CSR yang sudah ditetapkan oleh pemerintah. Tujuan penelitian ini ialah mengetahui penerapan program CSR yang dilaksanakan perusahaan tambang PT.X di Kabupaten Lahat. Penerapan CSR penting untuk diteliti dikarenakan saat ini CSR yang dilaksanakan oleh perusahaan pertambangan menberikan banyak manfaat positif bagi masyarakat. Selain itu juga, penerapan CSR dilaksanakan sebagai bentuk perwujudan dari perusahaan yang telah melaksanakan tanggung jawab sosial terhadap masyarakat sekitarnya. Metode penelitian yang digunakan merupakan penelitian kualitatif untuk nantinya dapat ditentukan data apa saja yang diidentikasi dan diolah. Adapun data yang didapatkan pada program CSR oleh perusahaan PT. X terdiri dari data hubungan dan pemberdayaan masyarakat, pengembangan infrastruktur, bencana alam dan lingkungan serta operasional. Hasil penelitian menunjukkan bahwa dalam kelima aspek tersebut, PT.X telah menjalankan penerapan program CSR sesuai dengan arahan dari pemerintah dan bekerja sama dengan pihak Bappeda dalam penyaluran CSR. Sehingga dari penerapan program CSR oleh PT.X dapat memberikan peran serta kontribusi bagi masyarakat sekitar.
PEMANFAATAN BIOCHAR LIMBAH KAYU KARET DAN BROWN COAL SEBAGAI BAHAN BAKAR ALTERNATIF Afrah, B. D.; Oktarinasari, E.; Putri, R. W.; Riady, M. I.; Saputri, J. F. D.; Putri, T. M. R.
Jurnal Pertambangan Vol. 8 No. 3 (2024): Agustus 2024
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v8i3.2288

Abstract

Lebih dari 41% rumah tangga dan 2,8 miliar orang di seluruh dunia bergantung pada bahan bakar padat termasuk batubara. Cadangan batubara yang tersedia di Indonesia sebesar 31,7 miliar ton dan hanya cukup untuk 65 tahun ke depan. Hal ini membuat pemerintah mendorong pengembangan penelitian pemanfaatan limbah biomassa sebagai energi alternatif. Upaya yang dilakukan ialah mengkonversi limbah biomassa berupa kayu karet menjadi bahan bakar padat alternatif melalui proses pirolisis. Biochar dihasilkan dari biomassa melalui pirolisis sehingga menghasilkan kualitas pembakaran yang sangat baik. Biochar hasil pirolisis dikombinasikan dengan brown coal dan perekat molase untuk menciptakan biobriket batubara sebagai bahan bakar padat alternatif. Tujuan penelitian ini untuk mengidentifikasi komposisi brown coal dan biochar yang optimal dalam menghasilkan biobriket batubara dengan kualitas terbaik. Proses pirolisis limbah kayu karet dilakukan pada temperatur 350-400°C selama 2 jam. Penelitian ini menggunakan variasi komposisi biochar (75%, 80%, 85%, 90%, dan 95%) dan brown coal (5%, 10%, 15%, 20%, dan 25%) serta perekat molase 15 mL. Pengujian kualitas pembakaran biobriket batubara melalui analisis proksimat dan nilai. Hasil penelitian menunjukkan bahwa produk biobriket batubara yang paling optimal adalah sampel dengan komposisi 85% biochar dan 15% brown coal.
THE IMPACT OF CHANGES IN ROYALTY RATES ON COMPANY PROFITABILITY: A CASE STUDY OF PT BUKIT ASAM TBK Puspita, M.; Arafiq, R. M.; Gobel, A. P.; Oktarinasari, E.; Amalia, R.
Jurnal Pertambangan Vol. 9 No. 1 (2025): Februari 2025
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v9i1.2907

Abstract

In recent years, the Indonesian government has twice amended the regulations regarding coal royalty rates, namely in 2019 and 2022. Based on Government Regulation No. 81 of 2019, coal royalty rates range from 3-7% (open pit) and 2-6% (underground), depending on the calorific value. Following the implementation of Government Regulation No. 26 of 2022, coal royalty rates have undergone significant changes, ranging from 5% to 13.5% depending on the calorific value and the government-set reference coal price. This new policy is deemed risky for reducing profitability due to the increased amount of royalties that must be paid. This study aims to calculate the increase in royalty costs and assess the financial performance of companies in adapting to the policy using the net profit margin (NPM). The results show that in the fourth quarter of 2022, there was a 107.63% increase in royalty costs. However, this increase in royalties did not cause the companies' profitability to decline. The NPM percentage tended to increase during the period from 2020 to 2022, reaching 13.9%, 27.5%, and 30%, respectively. This was partly due to an increase in sales volume and improved coal prices in 2022. Thus, it can be concluded that the increase in sales volume and coal prices during this period had a positive impact in offsetting the rise in royalty rates caused by the implementation of Government Regulation No. 26 of 2022. As a result, PT Bukit Asam, Tbk's NPM continued to show a positive trend during this period.
TECHNICAL STUDY OF OVERBURDEN EXCAVATION METHODS BASED ON MATERIAL CHARACTERISTICS AT PT KALTIM PRIMA COAL Oktarinasari, E.; Pangestika, L. A.; Pebrianto, R.
Jurnal Pertambangan Vol. 9 No. 1 (2025): Februari 2025
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v9i1.2909

Abstract

PT Kaltim Prima Coal is one of the largest companies in Indonesia engaged in coal mining. PT Kaltim Prima Coal aims to achieve an annual production target of 50.5 million tons of coal by 2024. To maintain a high production level, PT Kaltim Prima Coal must select the most appropriate and effective mining method to achieve fleet productivity. For this purpose, a technical study focused on selecting the most suitable overburden excavation method based on the characteristics of the overburden layers is required. The initial step to determine the most suitable method to apply is to use the Franklin Index diagram. Using the Franklin Index diagram requires testing the point load index of the overburden material at Pit X and directly measuring the fracture spacing (scanline fracture spacing) at the research site. Based on the analysis of data and technical studies conducted, overburden layers A, B, C, F, H, and I are recommended to use blasting methods for loosening, overburden layers D and E are recommended to use free excavation methods, and for overburden layers G, J, and K, it is recommended to use double blasting methods for loosening. Observations related to the productivity of excavator units at Pit X revealed an increase in productivity for each unit that initially used the free excavation method and was switched to the blasting method, ranging from 15% to 39% for the Liebherr R996, while a smaller increase occurred for the Hitachi EX3600-6B, which only saw a 3% increase in productivity.
PERFORMANCE AND OPERATIONAL COSTS OF STRIPPING OVERBURDEN AT PT BUMI SEKUNDANG ENIM ENERGY Puspita, M.; Wijaya, S.; Oktarinasari, E.; Mahdyrianto, F.; Erwedi
Jurnal Pertambangan Vol. 9 No. 3 (2025): Agustus 2025
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v9i3.2930

Abstract

The plan for overburden stripping at PT Bumi Sekundang Enim Energy's Pit AB was 332,829.17 BCM/month, but the company was unable to achieve this target. This study aims to evaluate the performance of overburden stripping, identify obstacles that affect overburden stripping, and calculate the costs of overburden stripping before and after improvements are made to overcome these obstacles. This study uses a descriptive-analytical quantitative approach with a case study at PT Bumi Sekundang Enim Energy. The actual productivity of the transport equipment obtained is 20.5 BCM/hour, lower than the specified target of 22.37 BCM/hour. The failure to achieve this overburden stripping was due to obstacles that reduced effective working time and mechanical equipment efficiency. Improvements were made to delay time and idle time, successfully reducing total downtime by 40.64%. As a result, mechanical equipment efficiency increased to 77.82%. After the improvements were made, the productivity of the transport equipment increased to 25.67 BCM/hour and the overburden stripping target was achieved with a percentage of 114.76%. The operational costs of overburden stripping consist of excavation and transportation costs by mechanical equipment. The costs taken into account include fuel, lubricants and filters, tire and undercarriage replacement, ground engaging tools replacement, and operator wages. The operational cost of stripping overburden before the improvement was Rp 20,473/BCM, but after the improvement, the cost decreased by 20.14% to Rp 16,350/bcm.
Co-Authors Afrah, B. D. Amalia, R. Arafiq, R. M. Arief, T. Bazlina Dawami Afrah Erwedi Gobel, A. P. M. Puspita M. Yusuf Mahdyrianto, F. Pangestika, L. A. Pebrianto, R. Putri, R. W. Putri, T. M. R. Riady, M. I. Riady, M.I. Saputri, J. F. D. Wijaya, S.