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KAJIAN IMPLEMENTASI KESELAMATAN DAN KESEHATAN KERJA TAMBANG BATU ANDESIT PERUSAHAAN X DESA HARGOREJO KECAMATAN KOKAP KABUPATEN KULON PROGO DAERAH ISTIMEWA YOGYAKARTA Nuha, Putra Ullin; Probowati, Dyah; Amri, Nur Ali
Prosiding Seminar Nasional Sains dan Teknologi Terapan 2021: Peluang dan Tantangan Peningkatan Riset dan Teknologi di Era Pasca Covid-19
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Perusahaan X merupakan salah satu perusahaan pertambangan yang mengelola kekayaan alam berupa batu andesit. Perusahaan melakukan penambangan permukaan dengan metode quarry yang berlokasi di Desa Kalirejo, Kecamatan Kokap, Kabupaten Kulon Progo, Daerah Istimewa Yogyakarta. Tujuan penelitian ini adalah menganalisis potensi bahaya pada kegiatan penambangan serta melakukan upaya pengendaliannya dengan menggunakan metode pengendalian risiko dari Keputusan Direktur Jenderal Mineral dan Batubara Kementerian Energi dan Sumber Daya Mineral No. 185.K37.04.DJB. 2019. Hasil penilaian risiko kejadian berbahaya berdasarkan penilaian AS/NZS 4360:2004 adalah: Pada tahap penggalian terdapat 4 kejadian berbahaya risiko tinggi dan 2 kejadian berbahaya risiko sedang. Pada tahap loading terdapat 3 kejadian berbahaya risiko tinggi dan 2 kejadian berbahaya risiko sedang. Sedangkan untuk tahap pengangkutan, terdapat 3 kejadian berbahaya risiko tinggi dan 1 kejadian berbahaya risiko sedang.

PRODUKSI SERBUK KALSIUM KARBONAT DENGAN MESIN PENGGERUS HASIL MODIFIKASI PADA PT SUGIH ALAMANUGROHO Wahyuningsih, Tri; Probowati, Dyah; Hermanto, Olivia Silvi; Asworo, Monika; Setyawan, Meindra
Jurnal Teknologi Mineral dan Batubara Vol 19 No 3 (2023): Jurnal Teknologi Mineral dan Batubara Edisi September 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol19.No3.2023.1287

Limestone is a sedimentary rock formed naturally from the died marine organisms. Limestone is used in various industrial fields, such as paint, plastics, carpets and soil pH regulator industries. PT. Sugih Alamanugroho is a limestone mining and calcium carbonate powder producer company. To produce calcium carbonate powder, limestone is dried, comminuted, and classified by size. The drying process reduces moisture content less than 4%. Then, the limestone is crushed by a jaw crusher and followed by secondary crushing by means of a hammer mill. The results of the secondary grind are crushed again using a modified grinding machine. Calcium carbonate powder will pass through an 800-mesh screen into the cyclone collector using a blower. In the cyclone collector, 800-mesh powder falls into the bottom of the cyclone, while 1200-mesh powder comes out of the cyclone and enters the cloth bags. The position of the feed on the side of the modified grinding machine is able to reduce collisions with the product. From the entire production steps, calcium carbonate powder products were produced, but did not meet the production amount target due to obstacles that occurred in the form of power outages, replacement of spare parts or equipment maintenance, machine breakdowns and late availability of spare parts.

Pengaruh Infill Type Hasil Cetak 3D Printer Terhadap Sifat Mekanik Material Berbahan Polylactic Acid (PLA) Setiawan, Agris; Maharani, Intan; Probowati, Dyah
Rekayasa Material, Manufaktur dan Energi Vol 5, No 1: Maret 2022
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v5i1.10258

The development of a quality product to get good results requires a technology, one of which is the use of 3D printing machines. One type of material that is most often used in the 3D Printer process is Polylactic acid (PLA). The results of the 3D Print must be carried out several tests, such as tensile, shrinkage, and flexural tests to find out how strong the specimen is to withstand the load that will be given. One of the factors that affect the tensile, shrinkage and flexural test results of the 3D Printer is the type of filler (pattern). Therefore, in this study, 3 types of tests will be carried out on variations in the infill type, namely triangle, concentric and gyroid. Specimen design was made using Autodesk Inventor software with reference to the standard dimensions of ASTM D638 Type IV for tensile testing of specimens and standard dimensions of ASTM D790 for flexural tests of specimens. Samples are characterized by using specimen code A, specimen B and specimen C. For example, specimen code A is the code for specimens with an infill gyroid, specimen B is a code for specimens with a concentric infill type and specimen code C is a code for specimens with an infill. triangle type. Results Based on the shrinkage measurements on the tensile test specimen and the flexural test specimen, it was found that specimen C had a fairly large shrinkage value compared to other specimens, namely 2.210.97% and 20.21%. The results of the tensile test also showed that specimen C had a higher ultimate tensile strength than the other specimens, which was 39.230.93 MPa. Based on the results of the flexural test that has been carried out, it can be seen that the highest flexural strength value is found in specimen C, which is 48.693.17 MPa. While the results of the porosity of the specimen showed that specimen C had a smaller porosity than the porosity of other specimens. Based on the 3 types of specimen variations, it can be said that specimen C has better strength and resistance values than other specimens.

KAJIAN TEKNIS PRODUKTIVITAS ALAT GALI MUAT DAN ALAT ANGKUT PADA PENGUPASAN LAPISAN OVERBURDEN DI PIT B TAMBANG BATUBARA PT TATA BARA UTAMA KABUPATEN BARITO UTARA KALIMANTAN TENGAH Zuhhad, Zulfikar Yahya; Siri, Hasywir Thaib; Probowati, Dyah; Linggasari, Shenny; Suharyadi, Heru; Mawardi, Aji
Jurnal Teknologi Pertambangan Vol 9, No 2 (2024): Januari 2024
Publisher : Universitas Pembangunan Nasional Veteran Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jtp.v9i2.11879

PT Tata Bara Utama merupakan kontraktor dari PT Pada Idi yang bergerak di bidang pertambangan batubara. PT Tata Bara Utama menetapkan terget produktivitas pengupasan lapisan tanah penutup sebesar 200 BCM/Jam dengan 2 fleet penambangan pada bulan Maret 2023. Produktivitas pada saat dilakukannya penelitian belum memenuhi target produktivitas yang sudah ditetapkan sehingga berdampak pada terlambatnya pengambilan batubara.Penelitian ini bertujuan untuk menganalisis faktor-faktor penyebab target produksi belum tercapai dan menentukan upaya-upaya yang dapat dilakukan untuk meningkatkan produktivitas di PT Tata Bara Utama. Berdasarkan perhitungan, produktivitas alat gali muat saat ini sudah mencapai target produktivitas yang mana nilainya untuk fleet 1 sebesar 269 BCM/Jam dan fleet 2 sebesar 252 BCM/Jam. Untuk produktivitas alat angkut kedua fleet belum mencapai target yang mana nilainya untuk untuk fleet 1 sebesar 165 BCM/Jam dan fleet 2 sebesar 147 BCM/Jam.Berdasarkan hasil penelitian penyebab tidak tercapainya target produktivitas adalah lebar front area penambangan dan kecepatan alat angkut yang belum efisien sehingga menyebabkan cycle time alat angkut menjadi tinggi.Upaya-upaya yang dilakukan untuk mencapai target produksi yaitu pelebaran area front penambangan dan simulasi rimpull untuk meningkatkan kecepatan alat angkut yang nantinyaakan mengoptimalkan cycle time alat angkut. Setelah perbaikan didapatkan produktivitas alat angkut menjadi 229 BCM/Jam untuk fleet 1 dan 201 BCM/Jam untuk fleet 2.

Analysis of Baturagung Reservoir Leaking, Gedangrejo, Gunung Kidul Regency using Digital Outcrop Model Method Farisan, Ardhan; Bahagiarti, Sari; Nurwantari, Nanda Ajeng; Setyaningrum, Tuti; Rahatmawati, Istiana; Zakaria, Muhammad Faizal; Probowati, Dyah
Jurnal Lingkungan dan Bencana Geologi Vol 15, No 1 (2024)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v15i1.482

Water, serving as a vital resource, finds applications in diverse sectors such as agriculture (irrigation), drinking watersupply, flood control, and hydroelectric power generation. On a smaller scale, the construction of "Embung" or smallartificial reservoirs facilitates water storage during the rainy season for subsequent use in the dry season. Within thestudy area, a reservoir constructed in 2018 has never attained full capacity, a circumstance that piqued the author'sinterest. A combined approach utilizing aerial photogrammetry and ground observation is employed for comprehensiveanalysis. Aerial photogrammetry yields an extensive and accurately depicted geometric representation of geologicalstructures. The investigation focuses on the Semilir Formation, a volcanic formation. Findings reveal that the studyarea manifests a division into nine (9) segments discerned from distinct structural trends. These segments are delineatedby eight (8) faults, with the major fault identified as Fault F6. Fault F6 exhibits a prevailing NNE-SSW trend,consistent with the primary fault on the regional geological map. Notably, Fault F6 encompasses a substantial faultzone traversing the Baturagung Reservoir and stands accountable for the reservoir's leakage.

Rancangan Optimasi Proses Blending Batubara Di PT Binuang Mitra Blok Dua, Kecamatan Binuang, Kabupaten Tapin, Kalimantan Selatan Anin, Michell Satria Chame; Haq, Shofa Rijalul; Probowati, Dyah; Ernawati, Rika
Jurnal Teknologi Pertambangan Vol. 10 No. 2 (2025): Januari 2025
Publisher : Universitas Pembangunan Nasional Veteran Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jtp.v10i2.14548

PT Binuang Mitra Bersama Blok Dua (PT BMBBD) operates in the coal mining industry with a focus on blending coal to meet market specifications. The main challenge faced by the company is maintaining the consistency of the coal's calorific value, targeted between 4000-4200 Kcal/kg. Variations in coal quality resulting from different seams, along with an optimal blending process not yet in place, lead to discrepancies between production results and the set standards. This research aims to analyze the suitability of the calorific value of PT BMBBD's coal in line with marketing targets, evaluate the effectiveness of the blending process implemented, and optimize the mixing of coal to achieve more consistent results that align with market specifications. The data used in this study includes primary data from field sampling and laboratory tests, as well as secondary data obtained from coal quality reports and internal company information. Data analysis is conducted using proximate analysis methods according to ASTM standards, along with optimization of the blending process using Microsoft Excel's Solver. The research results indicate that there is a discrepancy between the coal quality produced and the calorific value targets set by the company. Some seams produce coal with lower quality than the expected standards, highlighting the need for blending process optimization. By applying optimization methods, the results of the coal blending can be better aligned with market needs, thereby improving the consistency of calorific values and production efficiency. This study provides significant contributions to the operational improvement of PT BMBBD, particularly in efforts to enhance coal quality and consistency. The findings are expected to serve as a reference for the company in optimizing the blending process and managing coal quality more effectively in accordance with market demands.

KAJIAN MANAJEMEN RISIKO PADA PENGANGKUTAN MATERIAL ORE DAN WASTE DI PT SAMUDERA MULIA ABADI JOB SITE PT J RESOURCES BOLAANG MONGONDOW, SULAWESI UTARA Ridwania, Naufal Nida Sabila; Ratminah, Wawong Dwi; Probowati, Dyah; Winda, Winda
Jurnal Teknologi Pertambangan Vol. 10 No. 2 (2025): Januari 2025
Publisher : Universitas Pembangunan Nasional Veteran Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jtp.v10i2.14552

PT. Samudera Mulia Abadi merupakan perusahaan yang bergerak di bidang pertambangan, dengan lokasi penambangan yang terletak di daerah Desa Bakan, Lolayan, Bolaang Mongondow, Sulawesi Utara. Sistem Penambangan yang digunakan oleh PT. J Resource adalah tambang terbuka dengan metode open pit. Penelitian dilakukan di Pit Mainridge. Pada penelitian memfokuskan pada proses pengangkutan Material ore dan waste dari Front Mainridge menuju HLP dan Wastedump Magazine. Untuk menghindari kemungkinan terjadinya kecelakaan kerja, maka perlu dilakukan manajemen risiko pada kegiatan pengangkutan Material ore dan waste untuk mengurangi atau menghilangkan kemungkinan terjadinya kecelakaan kerja yaitu dengan melakukan identifikasi potensi bahaya, penilaian risiko, dan pengendalian risiko menggunakan metode Hazard Identification and Risk Assessment. Berdasarkan hasil identifikasi bahaya pada kegiatan pengangkutan Material ore dan waste terdapat 12 potensi bahaya yang terdiri atas 7 kondisi tidak aman dan 5 tindakan tidak aman. Berdasarkan metode root cause analysis diagram fishbone diperoleh 3 faktor yaitu factor manuasi, factor lingkungan dan factor metode.. Kemudian dilakukan penilaian risiko yang mana diperoleh hasil berupa 3 risiko tingkat critical, 4 risiko tingkat high,dan 5 risiko tingkat medium. Setelah dilakukan pengendalian risiko, tingkat risiko turun menjadi 0 risiko tingkat critical, 0 risiko tingkat high, 3 risiko tingkat medium, 9 risiko tingkat low. Dari hasil penelitian, diperlukan adanya evaluasi geometri jalan pada kegiatan pengangkutan Material ore dan waste. Dari hasil evaluasi geometri jalan masih terdapat segmen jalan yang memerlukan perbaikan pada lebar jalan,), cross slope, superelevasi, besar sudut belokandan tinggi tanggul pengaman (safety berm).

Optimasi Fe-S Pada Residu Leaching Emas dengan Flotasi Powder Lime dan Lime Milk Suratinoyo, Zahna Allya Zulfa; Amalia, Yasmina; Probowati, Dyah
Rekayasa Material, Manufaktur dan Energi Vol 8, No 2: JULI 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i2.25790

Gold processing using the leaching method can produce large amounts of residue that often contain iron (Fe) and sulphur (S). This residue has the potential to become hazardous waste if not managed properly, as the sulphide content can cause acid mine drainage and environmental contamination. The Fe-S content has potential as an additive in the construction industry, such as in asphalt and concrete mixtures. One method that can be used to separate and reuse the Fe-S components from leaching residues is flotation. This study was conducted quantitatively through laboratory experiments. The reagents used in this study were PAX (Potassium Amyl Xanthate) as a collector, MIBC (Methyl Isobutyl Carbinol) as a frother, and CuSO₄ and lime as modifiers. The lime used was powder lime (lime powder) and lime milk (dissolved lime). The objective of this study was to determine the influence of powder lime and lime milk variables in the flotation process of gold leaching residues, as well as to determine the optimal use of lime in terms of economic efficiency. The results obtained from this study indicate that flotation using powdered lime is more economical, with a lime cost of Rp165.60 per kg of feed, yielding an Fe content of 38.9% and an S content of 49.1%. Furthermore, the Fe recovery rate was 77.5% and the S recovery rate was 80.1%.

Analysis of Tin Grade and Recovery in Monazite Retreatment with Three Disc Magnetic Separator Adi Putri, Lintang Larasati; Probowati, Dyah; Amalia, Yasmina
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.12900

Retreatment is conducted to obtain tin that remains in the monazite tailings (2-3% Sn) from the processing that has been carried out by PT. Timah. The purpose of this study is to analyse the presence of tin in monazite as well as the effect of magnetic intensity and opening feed on recovery and tin grade by employing a quantitative method of experimentation with three disc magnetic separator. In this study, magnetic intensity was used with disc 1, 2, and 3 respectively is 1.1 T, 1.3 T, 1.5 T (A); 1.3 T, 1.5 T, 1.7 T (B); and 1.5 T, 1.7 T, 1.9 T (C) with opening feed 0.4 cm and 0.8 cm. Based on the experiment, the highest tin grade is 7.33% with the largest combination of magnetic intensity, variation C, and opening feed 0.4 cm. Meanwhile, the highest recovery of 73.64% was obtained at the lowest magnetic intensity, variation A, with the same opening feed. It can be seen that by increasing the magnetic intensity, the tin content will be higher. Meanwhile based on some related experiment, the larger the opening feed, the higher the recovery. However, it should be noted that the opening feed used must not exceed 0.8 cm. If the opening feed used is equal or wider than 0.8 cm, it requires a strong magnetic intensity or the grade and recovery produced will not change significantly.

PRODUKSI SERBUK KALSIUM KARBONAT DENGAN MESIN PENGGERUS HASIL MODIFIKASI PADA PT SUGIH ALAMANUGROHO Wahyuningsih, Tri; Probowati, Dyah; Hermanto, Olivia Silvi; Asworo, Monika; Setyawan, Meindra
Jurnal Teknologi Mineral dan Batubara Vol 19 No 3 (2023): Jurnal Teknologi Mineral dan Batubara Edisi September 2023
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol19.No3.2023.1287

Limestone is a sedimentary rock formed naturally from the died marine organisms. Limestone is used in various industrial fields, such as paint, plastics, carpets and soil pH regulator industries. PT. Sugih Alamanugroho is a limestone mining and calcium carbonate powder producer company. To produce calcium carbonate powder, limestone is dried, comminuted, and classified by size. The drying process reduces moisture content less than 4%. Then, the limestone is crushed by a jaw crusher and followed by secondary crushing by means of a hammer mill. The results of the secondary grind are crushed again using a modified grinding machine. Calcium carbonate powder will pass through an 800-mesh screen into the cyclone collector using a blower. In the cyclone collector, 800-mesh powder falls into the bottom of the cyclone, while 1200-mesh powder comes out of the cyclone and enters the cloth bags. The position of the feed on the side of the modified grinding machine is able to reduce collisions with the product. From the entire production steps, calcium carbonate powder products were produced, but did not meet the production amount target due to obstacles that occurred in the form of power outages, replacement of spare parts or equipment maintenance, machine breakdowns and late availability of spare parts.

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