Abstract.Mining industry provides benefits to the state in mining as a source of state revenue and foreign exchange earner, producing raw materials for the industrial, infrastructure and socio-economic facilities, and employment providers.
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.
Environmental sustainability is a key issue of the coal mining sector. This is because the impact of damages on activities undertaken in this sector is deemed vulnerable to environmental sustainability. The damage that occurs has an impact on environmental unsustainability. The value of environmental sustainability is set forth in the Government Regulation No. 46 of 2017 on Environmental Economic Instruments. Under this regulation, any activity that has an impact on the environment including the coal mining sector shall assess the damage it causes. The mathematical model of environmental benefits and cost of coal mining discovered by Juniah (2013), is an expansion of the extended mathematical model of the benefits and costs of Munasinghe (1997). This model can be used and implemented to assess environmental losses and determine the value of environmental sustainability of coal mining as intended by the Government Regulation of the Republic of Indonesia. The environmental losses can be minimized by utilizing water void mine as raw water. This model can also be used by government, stakeholders, and mining investors to assess the sustainability of the coal mining environment for the resulting externalities, and the utilization of mine void water as raw water.
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.
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