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Rizki Amalia
Department of Mining Engineering, Engineering Faculty, Hasanuddin University
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering

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Revenue Estimation of Pit Seam 14 Quarter Mine Block Sequence Design Based on Coal Reference Price Prediction at PT Alam Jaya Pratama, East Kalimantan Province Aryanti Virtanti Anas; Rahmat Hidayat; Rizki Amalia; Muhammad Ramli; Nirmana Fiqra Qaidahiyani; Yoga Apri Disetia
EPI International Journal of Engineering Vol 3 No 2 (2020): Volume 3 Number 2, August 2020
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082020.01

Abstract

Seam 14 is one of coal prospects owned by PT Alamjaya Bara Pratama (PT ABP) with an estimated coal resources of ±4,022,458.63 tons which is will be produced in 2020 so that required a pit and mine sequence design used as a guideline in carrying out coal production activities. On the other hand, the uncertainty of coal prices caused the mine sequence design to be evaluated within a certain time as the coal reference price (HBA) was altered and company’s production target. The model equation of coal reference price prediction in 2020 was carried out by using multiple linear regression method. Based on that model, prediction of coal reference price was obtained in CW 1 = $80.21, CW 2 = $81.47 and CW 3 = $82.50. The Pit 14 was designed with the consideration of company's geotechnical recommendation which is can be achieved on the conditions of stripping ratio (SR) of 6 and 7. The mine sequence was designed base on the evaluation of coal production in 2019 (CW 1 = SR > 3, CW 2 = 3 ≤ SR ≤ 6 and CW 3 = SR > 6). The calculation results of estimated revenue of Pit 14 with SR = 6 is CW 1 = US$40,131,297.12; CW 2 = US$36,431,457.31; and CW 3 = US$19,601,965.40. Estimated revenue of Pit 14 with SR = 7 is CW 1 = US$41,821,080.50; CW 2 = US$39,204,128.39; and CW 3 = US$31,715,767.60.
Evaluation of Articulated CAT 745 Fuel Ratio Based on Haul Road Geometry at PT Hillconjaya Sakti Site PT Adhi Kartiko Pratama Tbk Aryanti Virtanti Anas; Wahyuni S; Rini Novrianti Sutardjo Tui; Rizki Amalia
EPI International Journal of Engineering Vol 8 No 1 (2025): Volume 8 Number 1, Februari 2025
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022025.03

Abstract

The distance for transporting overburden at PT Hillconjaya Sakti reaches hundreds of meters. Based on actual conditions, Articulated CAT 745 queues often occur on certain haul road segments due to unsuitable haul road conditions so the fuel ratio value is in the low performance category. The purpose of this study is to evaluate the fuel ratio value and provide recommendations for improving the geometry of haul roads to meet the established fuel ratio value standards. Multiple linear regression analysis using Eviews 12 VS was used to determine the variables that significantly affect the fuel consumption of hauler based on haul road geometry. Road grade, total resistance, travel time and speed of the hauler are independent variables, while fuel consumption is the dependent variable. Based on the results of data processing, a fuel ratio value of 1.85 was obtained and the parameters that had a significant effect on fuel consumption were total resistance and travel time. Improvement of haul road conditions based on ESDM Decree No. 1827 K/30/MEM/2018 and AASHTO Manual Rural High Way Design. The fuel ratio value after repairs decreased to 0.60 and was in the best performance category based on PT Hillconjaya Sakti's standard fuel ratio value.
Co-Authors Aryanti Virtanti Anas Muhammad Ramli Nirmana Fiqra Qaidahiyani Rahmat Hidayat Rini Novrianti Sutardjo Tui Wahyuni S Yoga Apri Disetia