Investment Analysis And Economic Benefits Of Depressurisation Strategies For Enhanced Slope Stability And Optimization Of Coal Mine Slopes
Abstract
PT OPQ aims to increase its coal production target from 50 million tons in 2025 to 100 million tons in 2030 to meet both domestic and export market demand which aligns to the strategic direction from management. However, because of the geological and hydrogeological constraints and land limitations in Pit BU, there are only so many optimizations that can be done with just technical evaluations. It is necessary to conduct a thorough economic feasibility assessment to identify if the chosen operational approach can be executed profitably within the framework of the company’s long term business goals. Given the constraints that PT OPQ faces in PIT BU, the consideration of investment feasibility, driven through technical data in assessment of slope depressurization hipothetical scenarios, from a geological, hydrogeological and mine planning perspective, is paramount. Equally, having such a complex technical assessment requires a financial counterpart. This is the purpose of the study, to construct a financial model based on Discounted Cash Flow, with the Payback Period, Discounted Payback Period, Net Present Value (NPV), Internal Rate of Return (IRR), and Profitability Index (PI) as the key decision parameters. To understand the effect of market fluctuations and operational risk with respect to the investment’s feasibility, sensitivity analysis and Monte Carlo simulation were conducted. Analyzing the financial risk from the NPV also indicates the least risk to the finances of the business from the base case scenario. Therefore, the choice of depressurization (Option 2) compared to continued operation without depressurization (Option 1) illustrates that there is greater financial potential. In the worst case, there is still a minor loss of financial potential for a scenario exhibiting the dependence on the price of coal. Thus, the approach for depressurization is the best for the medium term, though there needs to be a reconsideration of the cost of the coal, the coal from the closed mine, the loss of volatility of the coal, and the mining of coal.
Downloads
Copyright (c) 2026 Reynara Davin Chen, Oktofa Yudha Sudrajad
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
An author who publishes in the EKOMBIS REVIEW: Jurnal Ilmiah Ekonomi dan Bisnis agrees to the following terms:
Author retains the copyright and grants the journal the right of first publication of the work simultaneously licensed under the Creative Commons Attribution-ShareAlike 4.0 License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal
Submission of a manuscript implies that the submitted work has not been published before (except as part of a thesis or report, or abstract); that it is not under consideration for publication elsewhere; that its publication has been approved by all co-authors. If and when the manuscript is accepted for publication, the author(s) still hold the copyright and retain publishing rights without restrictions. For the new invention, authors are suggested to manage its patent before published. The license type is CC-BY-SA 4.0.
EKOMBIS REVIEW: Jurnal Ilmiah Ekonomi dan Bisnis is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
