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All Journal Journal of Earth and Marine Technology (JEMT)
Pratiwi, Dita Irwanti
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Physics Transportation

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Revegetation of Used Limestone Mining Soil with the Addition of Humic Acid and Limestone Waste Pratiwi, Dita Irwanti; Nurcholis, Mohammad; Ernawati, Rika
Journal of Earth and Marine Technology (JEMT) Vol 4, No 2 (2024)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2024.v4i2.5372

Abstract

PT Akarna Marindo is a limestone mining company located in West Bandung that will carry out revegetation activities with Arabica coffee plants on ex-mining land. PT Akarna Marindo did this by mixing a combination of 5 mm limestone waste from crusher activities and humic acid in Arabica coffee growing media. This research aims to analyze the response of Arabica coffee seedlings to the use of a combination of humic acid and limestone waste. The research used an experimental method with experimental polybags consisting of 5 treatments with 3 repetitions. The response of Arabica coffee seedlings includes seed height and seed diameter. Data processing uses the Analysis of Variance (ANOVA) test. The results of the analysis showed that the response of Arabica coffee seedlings to the combination of 15 mL humic acid and 4 kg limestone waste (A15L4) was an optimal combination of humic acid and limestone waste compared to other treatments in the response of Arabica coffee seedlings. There was an increase in the average height of seedlings from 19.23 cm to 24.90 cm and the diameter of seedling stems from 2.13 mm to 2.53 mm.
Reclamation Plan for Production Operation Phase of Quartz Sand Mine in Riau Islands Pratiwi, Dita Irwanti; Nurcholis, Mohammad
Journal of Earth and Marine Technology (JEMT) Vol 4, No 1 (2023)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2023.v4i1.4828

Abstract

PT. X is a quartz sand mining company located in Riau Islands. PT. X has a mine life of 5 years, starting in the first year of 2023 until the last year of 2027. Mining activities have a negative impact on the environment, therefore reclamation activities are carried out at the production operation stage. The purpose of this study is to determine the area of land to be reclaimed, techniques and equipment to be used in reclamation, land stewardship, revegetation, maintenance, and reclamation costs. This research uses the actual calculation method this method has 4 stages, namely the preparation stage, the data collection stage, the research stage in the field, and the stage of preparing the final report. At the data collection stage using primary and secondary data owned by PT.X. Reclamation of the production operation stage carried out by PT. X uses Hybrid Coconut plants. Hybrid coconut will be reclaimed on former mining land during the life of the mine whose work process is carried out in tandem with quartz sand mining activities. The reclamation cost plan of PT. X consists of direct costs and indirect costs. The total cost plan of reclamation of PT. X amounted to Rp. 583,799,620.00.
Co-Authors Mohammad Nurcholis, Mohammad Rika Ernawati