Limestone mining activities at PT Semen Baturaja Tbk in Ogan Komering Ulu Regency of South Sumatera Province is conducted on an open quarry mining system. Limestone is the main raw material needed in the manufacture of cement in PT Semen Baturaja Tbk. Open-pit mining activities at the end of their activities will leave ex-mining land. The ex-mining land must be used for the mining environment remains sustainable. The ex-mining land can be used for various purposes such as rubber plantations, oil palm plantations, teak forests, pine forests, fruit orchards, and others. The former land of limestone mine of PT Semen Baturaja Tbk as stated in its post mine plan document, one of which is for rubber plantation. The research uses a survey method. The purpose of this research to assess the technical utilization of limestone mined land PT Semen Baturaja Tbk for rubber plantations for sustainable mining environment. The results are expected to benefit stakeholders, academics, researchers, practitioners and mining associations, and the environment.
Event open-pit mining methods in the exploitation of limestone by PT Semen Baturaja (Persero) Tbk cause depletion of water, air, and soil. At the end of mining activities will leave ex-mine land in the form of void and non void (empty land). Reclamation and Postmining must be carried out by the company according to the mandate of Government Regulation No. 78 year 2010. Reclamation and post-harvest activities on ex-non void mines can be revegetation activities, while void can be used as reservoirs for raw water sources. The aim is to maintain the sustainability of natural resources and water in the limestone mining environment. The research aims to determine the condition of void water produced from limestone mining activities for a sustainable environment. The method used in this study is using the pollution index method. The results showed that the water in the sump inlet and quarry outlet experienced mild pollution. Pollution index at the location of the limestone mine sump inlet worth 2.14 and for oulet quarry worth 2.07. This shows that mine void water is not feasible to be used as raw water, so water treatment needs to be done so that it meets the established quality standards. If void water comply the prescribed quality standards, environmental sustainability in the limestone mining sector can be achieved during during the life of the mine, post mining, until after the post-mining period.
Effective water resource management offers a very significant value across social, economic, commercial and environmental application. For this fundamental reason, adequate sustainability becomes equally crucial. Therefore, activities geared towards the depletion in quantity, quality, and loss of potable water resources, particularly for communities, demand urgent reconsiderations. Erosion in coal mining land causes depletion in water quantity and quality, as well as inadequate drinking water resources for surrounding communities, making water resources unsustainable. Meanwhile, reclamation reduces erosion, but is unable to restore water depletion optimally, thus, these resources remain unsustainable. these resources remain unsustainable. However, recycling depleted water utilization for drinking provides economic value for the environment, as well as the community’s drinking water resources’ availability and sustainability. The objectives of this study were to develop water resource sustainability concept for a sustainable environment by analyzing the potential economic value and secondly, calculate the water resource value due to erosion, reclamation, domestic and economic importance, by recycling efforts. The method used in this study was the Extended NPV. Furthermore, the total potential economic value of water resources loss resulting in water resource unsustainability was IDR 1,137,621,671,375 or IDR 1.14 trillion, while the potential economic value of depleted water utilization for drinking was IDR 2,298,339,797,000 or IDR 2.3 trillion. Therefore, this utilization provides potential economic value worth IDR 1.16 trillion, for the resources’ sustainability in the TAL area of PTBA. The study’s results found and recommended depleted water utilization for drinking as a suitable method to replace water resources lost due to erosion, community drinking water resource loss, and to discover a sustainable environment’s water resources sustainability concept. In addition, the study formulates environmental economics as a new mining science related to natural resource economics as well as mining, for sustainable water resources and mining environment.
Penulis Koresponden ABSTRAKTarget produksi perusahaan dalam pengupasan overburden adalah 200 BCM /jam, sementara aktual di lapangan masih di bawah target produksi. Oleh karena itu perlu dilakukan optimalisasi produksi dengan menggunakan teori antrian. Teori antrian merupakan metode yang dapat digunakan untuk memperhitungkan dan memodelkan perilaku truk dan loader di tambang terbuka agar kegiatan pemuatan berlangsung dengan lebih baik. Tujuan penelitian ini adalah mengoptimalisasi produktivitas alat gali muat dan alat angkut menggunakan metode . Data yang primer yang dibutuhkan data waktu edar gali muat, waktu edar alat angkut, waktu repair, waktu standby waktu kerja. Data sekunder yang dibutuhkan berupa waktu kerja tersedia perusahaan. Hasil penelitian menghasilkan produktivitas aktual excavator adalah 140,59 BCM/jam dengan metode kapasitas produksi dan 106,68 BCM/jam dengan menggunakan metode OEE, sedangkan dan dumptruck adalah 135,33 BCM/jam dengan metode kapasitas produksi dan 161,78 BCM/jam dengan menggunakan metode OEE dimana belum memenuhi target produksi. Produktivitas setelah dioptimalisasi untuk alat gali muat excavator meningkat 52,74% menjadi 297,49 BCM/jam dengan metode kapasitas produksi dan meningkat 58,85% menjadi 259,24 BCM/jam dengan menggunakan metode OEE, sedangkan produktivitas dumptruck meningkat 36,85% menjadi 214,31 BCM/jam dengan metode kapasitas produksi dan meningkat 22,47% menjadi 208,68 BCM/jam dengan menggunakan metode OEE dimana telah memenuhi target produksi.
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