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PENAMBANGAN MARMER PADA PT. MAKASSAR MARMER MULIAINDAH KABUPATEN MAROS Juanita R. Horman
INTAN Jurnal Penelitian Tambang Vol. 1 No. 1 (2018): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

Mining is the extraction of valuable minerals from the earth. Marble recovered by mining process. Marble is usually used as a building material. PT. Makassar Marmer Muliaindah is a private company, that is actively operating in marble mining in Indonesia. The mining system applied by PT. Makassar Marmer Muliaindah is Open Pit System with Quarry method. Phases of mining activities conducted by PT. Makassar Marmer Muliaindah include clearing, stripping, drilling, cutting, block splitting, block release, block refinement, loading, hauling and stocking.

PENENTUAN HARGA JUAL MINIMUM ANDESIT MENGGUNAKAN METODE BREAK EVEN POINT DAN NET ANNUAL VALUE PADA PT. PRO INTERTECH INDONESIA Juanita R. Horman
INTAN Jurnal Penelitian Tambang Vol. 2 No. 1 (2019): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

The recent increased development indirectly has an implication to the increase of the need of gravel materials. Thus, management efforts should be importantly implemented in mining operations, particularly Andesite. To run a new mining operation, an analysis regarding finance planning would be needed in order to determine the minimum selling price, so that the company was avoided from losses. The calculation method used to determine the selling price is Break Even Point and Net Annual Value. Break Even Point is a point or a condition where a company does not make profit and does not suffer losses. In other words, in that situation, the profit and the losses are zero. Meanwhile, Net Annual Value is used to calculate the amount of money that is the same value each year (during the life of the project) in which the value is equivalent to money value throughout the life of the project, at certain rate of return on capital (ith). According to the calculation, the Break Even Point of the operation is Rp. 19,898,009,014 (capital cost). The minimum selling price of andesite is Rp. 411,964.88/m3. Whereas, using Net Annual Value at 12.75% interest rate, the selling price of Andesite would be Rp. 284,224.15/m3 throughout 14 years of the operation.

ANALISIS KAUSALITAS ANTARA KONSUMSI BATUBARA DAN KONSUMSI BIOMASSA TERHADAP PERTUMBUHAN EKONOMI DI INDONESIA Arif Setiawan; Juanita R. Horman
INTAN Jurnal Penelitian Tambang Vol. 2 No. 1 (2019): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

Coal is one of the fossil fuels that can be utilised in various industries including the electric power industry, cement industry, paper industry, steel industry, and other industries. It is approximately 70 percent of Indonesian coal production utilised for the supply of domestic electricity, while 10 percent used for cement production, and the rest utilised for industrial fuel and metallurgical processes. In addition to coal, wood is also another source that is often used among the certain communities as biomass energy source. It is obvious that coal and biomass can be used as energy sources, which can be one of the drivers of economic growth (Gross Domestic Product). Therefore, the shortage of these energy sources can be an obstructive factor for the economic acceleration. The purpose of this study is to figure out the reciprocal relationship between the three variables. The method used in this study is Granger causality. The results indicate that there is a positive relationship between GDP and coal consumption, meaning that the use of coal is influenced by GDP. On the other hand, economic growth may also results in an increase in coal consumption.

PERKEMBANGAN REGULASI PENINGKATAN NILAI TAMBAH NIKEL DI INDONESIA Arif Setiawan; Juanita R. Horman
INTAN Jurnal Penelitian Tambang Vol. 2 No. 2 (2019): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

One of mining industry characteristics is non renewable, therefore its management should be optimal, efficient and environmentally oriented. Indonesian government has established the mining law as a main regulation in carrying out mineral and coal mining activities. The regulation related to mining industry was Act No. 11/1967, which then replaced by Act No. 04/2009. Implementing rule of the Act No. 04/2009 is regulated through a Government Regulation (PP). In order to implement this government regulation, a Minister Regulation is then need to be issued. The main objective of this research is to know the development of the downstream mining industry related to increasing value added, especially nickel. The method used in this study is a descriptive method that describes secondary data in the form of documentation obtained from various sources. The results shows that the implementation of Act No. 04/2009 has ogbligated the maning companies to built their smelters to run mineral processing and metal refining in five years, in which it can increase value added of minerals, including nickel. Therefore, according to the act, in 2014 raw ore exports should be banned. This condition results in a decrease of raw ore export. The construction of a smelter is used to process and purify nickel with levels above 2%. However, in Indonesia there is still nickel ore with levels below that level. Therefore, Ministerial Regulation No. 05/2017 was issued to overcome this problem, which is currently being replaced by ministerial regulation No. 25/2018.

ANALISIS PENGARUH KEMIRINGAN JALAN ANGKUT TERHADAP KONSUMSI BAHAN BAKAR DUMP TRUCK HINO 500 FG 235 JJ Rinaldi R. Wincono; Juanita R. Horman
INTAN Jurnal Penelitian Tambang Vol. 2 No. 2 (2019): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

Dump truck is one of the mechanical equipment that become the main conveyance in mining activity especially in open pit. In its use dump trucks require a variety of operational needs, one of them the need for fuel oil (diesel). Transportation Activities conducted by PT. Sumber Anugrah Buana using Hino 500 FG 235 JJ type hauling equipment. Transportation distance from the mining front to the stockyard of 120 meters is divided into two segments, segment A-B and B`-C with each slope of 10% -20%. The average fuel consumption of Hino 500 FG 235 JJ is 7.11 liter / hour. Based on the results of the analysis is known that the slope of the haul road greatly affect the large consumption of diesel fuel. Fuel consumption is most needed when traversing an uphill road with a 30% (+) road slope. On the uphill road there are several forces as a vehicle inhibitor.

CUT OFF GRADE NIKEL LATERIT PADA BLOK 1A PT. ANUGRAH SUKSES MINING Denzi Y. Rohmaningrum; Juanita R. Horman
INTAN Jurnal Penelitian Tambang Vol. 3 No. 1 (2020): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

PT. Anugrah Sukses Mining (ASM) is a company engaged in laterite nickel mining. PT. ASM has a production target of 140,000 tons / month, with an average nickel content of 1.95%. PT. ASM operates mining based on the divisions of regions or blocks of mining. Block 1A is the first block mined by PT. ASM. Block 1A has a total area of 490,000 m2 and is divided into three mining areas, namely pit 1, pit 2 and pit 3. This research focuses on the pit 2 mining front where limonite and saprolite as laterite nickel zonation. This research was conducted to determine the cut off grade of the laterite nickel grade of the planned sequence. Total tonnage of laterite nickel prior to pit formation was 235,943 tons, with 86,922 tons of waste, 149,021 tons of ore, 0.58: 1 of SR, and cut off grade % Ni ≥ 1.63. The total tonnage of laterite nickel after pit formed was 231,105 tons, with 81,414 tons of waste, 149,217 tons of ore, cut off grade % Ni 1.57 and 0.54: 1 of SR.

ANALISIS PENGGANTIAN BACKHOE TAHUN PEMAKAIAN KELIMA DENGAN METODE NET ANNUAL VALUE PADA PT IFISHDECO Raymon Andre Maraya; Juanita R. Horman
INTAN Jurnal Penelitian Tambang Vol. 3 No. 2 (2020): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

PT Ifishdeco is a mining company that uses backhoe Sany SY-365 in its demolition activities. One of backhoes used has the greatest mechanical avaibility compared to others, so it is necessary to analyze the replacement of equipment in order to know the right time for replacement. The method used is the engineering economic method of Net Annual Value (NAV) with the concept of ‘defender’ and ‘challenger’ to analyze the cost and benefits of the equipment that can be distributed anually. To determine the NAV of an equipment and to know the the right time for replacement, it is necessary to know how much revenue and cost required for the backhoe to operate during the replacement of the old backhoe (defender) with a new backhoe (challenger) by conducting a replacement experiment in the first year after the tool operates until the end of the project life. The calculation results indicated that the replacement of equipment is more profitable at the sixth year of the project time, with NPV value of USD 29,530,448.96 and NAV value of USD 4,012,241.81.

ANALISIS PENGARUH ISU HUBUNGAN PEMERINTAH INDONESIA DENGAN PERUSAHAAN MOBIL LISTRIK TESLA TERRHADAP ABNORMAL RETURN DAN TRADING VOLUME ACTIVITY PT. VALE INDONESIA TBK Windy Raharusun; Juanita R. Horman
INTAN Jurnal Penelitian Tambang Vol. 4 No. 1 (2021): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

This study aims to see the effect of the issue on the stock price of a nickel mining company, namely PT. Vale Indonesia Tbk. The total research time is 33 days with seven days of event period and 26 days of estimation period. The method used in this research is the event study method with the research variables are abnormal returns and trading volume activity. From the descriptive result, both abnormal return and trading volume activity affect the issue that can be seen with the mean value after the issue which is higher than the mean value before the issue. However, in the paired sample test, the two research variables yield different significance values. The abnormal return t value is -0.901 smaller than the t table of 0.4124 with a significance of 0.382, so the issue does not affect abnormal returns. The t trading volume activity is -2.305 higher than t table of 1.753 with a significance of 0.036, so the issue affects trading volume activity.

ANALISIS SENSITIVITAS di PT AE Klinton Butar-Butar; Juanita R. Horman
INTAN Jurnal Penelitian Tambang Vol. 4 No. 1 (2021): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

PT. AE is engaged in the mining industry which in all its business activities requires a large investment. Therefore, it is necessary to conduct an investment analysis to see how the feasibility of this business using Net Present Value (NPV), Benefit-Cost Ratio (BCR), and Internal Rate Of Return (IRR) methods. Followed by sensitivity analysis to look at the company's financial condition in case of changes of ±2.50%, ±5.00%, and ±7.50% in revenue and cost of revenue. The results of the calculation of business feasibility analysis obtained a value of $618,450.563, BCR worth 1.698, and IRR worth 35.71%. This indicates that the efforts undertaken are worth carrying out. AE is more sensitive to -5.00% revenue-generating negative NPV, i.e. ($121,203.568), BCR at 0.881, and IRR of 2.69%. While the increase of cost of revenue was 7.50%, resulting in a negative NPV of ($178,160.513), BCR of 0.830, and IRR of -0.09%.

PERHITUNGAN VOLUME BATUGAMPING MENGGUNAKAN METODE PENAMPANG Risky Y. Nainggolan; Juanita R. Horman
INTAN Jurnal Penelitian Tambang Vol. 4 No. 2 (2021): INTAN Jurnal Penelitian Tambang
Publisher : Jurusan Teknik Pertambangan Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

In the mining industry, it is very important to estimate the amount of mineral resources. This estimation aims to find out the volume of resources at the certain mining survey area. The estimation method used is the cross-section method, which is based on the rule of gradual changes and the rule of nearest point. The estimation using the rule of gradual changes shows that the total volume of limestone resources is 31,420 m³, and the volume of overburden is 27,572.6 m³. Meanwhile, the estimation using the rule of nearest point shows that the total limestone resource is 125,680 m³, and the overburden volume is 30,290 m³.

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