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All Journal Journals Mining Engineering : Bina Tambang JRTI (Jurnal Riset Tindakan Indonesia)
Refky Adi Nata
Universitas Negeri Padang
Religion Humanities Earth & Planetary Sciences Law, Crime, Criminology & Criminal Justice Social Sciences Other

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Analisis Sistem Ventilasi Tambang Batubara Bawah Tanah Untuk Kebutuhan Operasional Penambangan Pada Lubang Tambang C.2-I Job Site Sapan Dalam PT. Nusa Alam Lestari Parambahan Kota Sawahlunto Insani Sabilillah; Bambang Heriyadi; Jukepsa Andas; Refky Adi Nata
Journals Mining Engineering : Bina Tambang Vol 8, No 1 (2023): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v8i1.122252

Abstract

PT. Nusa Alam Lestari is an underground coal mining company located in Salak Village, Talawi District, Sawahlunto City, West Sumatra. Ventilation system at mine pit C.2-I Job Site Sapan Dalam PT. Nusa Alam Lestari uses a blow system. This study aims to evaluate the quality and quantity of ventilation systems for underground coal mines in accordance with the Decree of the Minister of Energy and Mineral Resources No. 1827 K/30/MEM/2018 and Decree of the Director General of Minerba and ESDM No. 185 K/37.04/DJB/2019 with parameters which include gas content, relative humidity, effective temperature value, work efficiency value and air quantity for mining operational needs. At mine pit C.2-I there is an advanced front and six mining branches. The average temperature measurement results in the working front of the C.2-I mine pit are 29.6oC and with an average humidity measurement result of 94.6%. This temperature value has passed the set threshold between 18oC - 27oC and the humidity has also passed the set threshold, which is 85%. In addition, the C.2-I mine pit does not apply a suction ventilation system, so that dirty air is not immediately transported out. The ventilation system applied to the C.2-I mine pit can only meet 70% of the air demand, so it is necessary to evaluate and design a new ventilation system. The design of the ventilation system is carried out by making a tail gate from the Cross Cut to the surface with an elevation of 15o with a length of 170 m. The end of the through hole is given an 18 inch Centrifugal Exhaust Fan, to suck in dust and dirty air. Making mining layouts using AutoCAD and design simulations using the Ventsim program. The results of the analysis show that the quantity of air in the C.2-I mine hole has increased from 4.08 m3/s to 7.38 m3/s. The design of the new ventilation system results in compliance with the values of air quality and quantity.
Rock mass-based blasting geometry evaluation using Kuz-Ram and split desktop for limestone fragmentation Prisdwiki Aldhatan; Jukepsa Andas; Rudy Anarta; Refky Adi Nata
JRTI (Jurnal Riset Tindakan Indonesia) Vol. 11 No. 2 (2026): JRTI (Jurnal Riset Tindakan Indonesia)
Publisher : IICET (Indonesian Institute for Counseling, Education and Therapy)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29210/30036986000

Abstract

This study aims evaluated limestone blasting geometry under massive and blocky rock-mass conditions and developed geometry adjustments to improve fragmentation control. Thirteen production blasts conducted at PT Semen Padang during April–May 2025 were analyzed quantitatively. Fragmentation was predicted using Kuz-Ram and verified against field fragmentation measured using Split Desktop 2.0.1, with X50 and boulders ≥50 cm as evaluation criteria. Actual boulder percentages for massive rock were 67.47% and 69.00% using Kuz-Ram and Split Desktop, respectively, whereas blocky rock yielded 44.89% and 56.00%. Kuz-Ram evaluation of the proposed geometry reduced X50 from 78.05 to 31.29 cm in massive rock and from 46.41 to 26.56 cm in blocky rock. These findings indicate that rock-mass-specific geometry adjustments can improve predicted fragmentation; however, field validation is required before operational implementation.
Comparative accuracy of Richard-Moore and Ghasemi models for Flyrock prediction in limestone blasting safety assessment Zikra Jastra Weda; Ahmad Fadhly; Refky Adi Nata; Heri Prabowo
JRTI (Jurnal Riset Tindakan Indonesia) Vol. 11 No. 2 (2026): JRTI (Jurnal Riset Tindakan Indonesia)
Publisher : IICET (Indonesian Institute for Counseling, Education and Therapy)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29210/30036988000

Abstract

This study aimed to compare the predictive accuracy of the Richard-Moore and Ghasemi models for limestone blasting and assess the adequacy of a 300 m equipment safety radius. Thirty blasting events at Bukit Karang Putih, PT Semen Padang, were evaluated using field-measured flyrock distances verified through GPS and ArcGIS. Model performance was assessed using RMSE and MAPE. The maximum observed flyrock distance was 210.74 m. The Ghasemi model achieved the lowest errors (RMSE 13.31 m; MAPE 6.81%), followed by Richard-Moore Face Burst (15.01 m; 8.03%). All observed and predicted distances remained below 300 m. The Ghasemi model provided more accurate site-specific predictions, while the existing safety radius accommodated the investigated events; however, broader validation across geological and operational conditions is required before wider application in mining contexts elsewhere.
Co-Authors Ahmad Fadhly Bambang Heriyadi Heri Prabowo Insani Sabilillah Jukepsa Andas Prisdwiki Aldhatan Rudy Anarta Zikra Jastra Weda