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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL AJIE (Asian Journal of Innovation and Entrepreneurship) Jurnal Teknologi Mineral dan Batubara BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) Jurnal Geosains dan Teknologi Jurnal Elemen Reswara: Jurnal Pengabdian Kepada Masyarakat Jurnal Geosains dan Remote Sensing (JGRS) Journal of Community Development INTAN Jurnal Penelitian Tambang Mining Science and Technology Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Jurnal Teknologi Mineral dan Batubara Jurnal Teknologi Sumberdaya Mineral
Siti Aminah
Progam Studi Teknik Pertambangan, Fakultas Teknik, Universitas Jember
Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Nursing Physics Public Health Social Sciences

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GLOBAL GOLD PRICE VOLATILITY AND ITS CORRELATION TO RESOURCE AND RESERVE DYNAMICS AT PT MERDEKA COPPER GOLD TBK Utari Retno Sulistyo Rini; Fanteri Aji Dharma Suparno; Siti Aminah; Haeruddin
INTAN Jurnal Penelitian Tambang Vol. 8 No. 2 (2025): INTAN: Jurnal Penelitian Tambang
Publisher : Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56139/intan.v8i2.346

Abstract

Gold (Au) commonly occurs as nuggets or grains in rock veins and alluvial deposits. Because of its scarcity, chemical stability, and distinctive properties, gold commands higher market prices than base metals. Global gold price volatility has a significant impact on the strategic decisions of mining companies. This study aims to quantify the correlation between international gold price fluctuations and the dynamics of gold resources and reserves at PT Merdeka Copper Gold Tbk. Using a quantitative approach, the average gold prices and the company's annually reported resource and reserve figures were analyzed. The Pearson correlation coefficient was employed to measure the strength and direction of the relationship. The results reveal a robust and statistically significant negative correlation. This inverse relationship suggests that periods of high price volatility are associated with a decrease in the company's reported gold resources and reserves. The findings highlight the significant impact of external market dynamics on resource management. It is recommended that stakeholders incorporate market volatility forecasts into long-term strategic planning and resource valuation models to enhance resilience.
Kajian Investigasi Potensi dan Eksplorasi Morfologi Gumuk di Kabupaten Jember Menggunakan Penginderaan Jauh: Indonesia Irawan, Januar Fery; Haeruddin; Aminah, Siti; Aji DS, Fanteri; Ulum, Miftakhul
Asian Journal of Innovation and Entrepreneurship Volume 08, Issue 02, May 2024
Publisher : UII

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ajie.vol8.iss2.art2

Abstract

Hummock is a typical morphology that is not found anywhere except in the active mountains. This uniqueness is due to the isolated hill shape with plain morphology formed in the geological setting. The existence of Gumuks dissiminated in Jember has been mined, causing their numbers to decrease drastically. Hummock in Jember district has a unique hill-shaped landscape with a height of over 2 meters. Hummocks in Jember are arranged from Raung Mount to the southwest to Jember Regency. There are several types (three) types of dunes that differ from the type of rock contained, namely rock dunes, coral dunes and sand dunes. At this moment, the existence of Hummock has been partially used for building material needs. The problem faced now is that the potential for piles other than as a building material requirement has not yet been researched. Therefore, effective management is needed through the identification of potential dunes through green mining research so that environmental problems are minimized when dune exploration is carried out. The purpose of this study was to find a green mining-based dune exploration technology, so that the treatment of each dune can be carried out appropriately. The stages of the research were carried out by observing the images. After the observations are made, field data is needed to validate and verify the pattern of dune. The research used remote sensing with guided techniques based on data in the field and geological maps. Based on remote sensing results it was found that there were 4 Classes in Land Use Change after Mining Operation carried out by people around the mine site.
Pengaruh Konsistensi Kolom Stemming Terhadap Fragmentasi Batuan Hasil Peledakan Supriyatna, Anjana; Aminah, Sitti; Haeruddin, Haeruddin
Mining Science And Technology Journal Vol 4 No 2 (2025): Mining Science and Technology Journal
Publisher : Program Studi Teknik Pertambangan, Fakultas Teknik, Universitas Sulawesi Tenggara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54297/minetech-journal.v4i2.1201

Abstract

Konsistensi kolom stemming merupakan salah satu faktor yang mempengaruhi dampak kegiatan peledakan. Stemming yang efektif mengurangi tingkat ledakan udara dan mengoptimalkan fragmentasi, yang berkontribusi pada efisiensi operasional dan produktivitas secara keseluruhan. Lokasi penelitian dilakukan di PT Nusantara Swadesi Mining Purwakarta, Jawa Barat yang memiliki permasalahan dalam memenuhi target produksinya. Oleh karena itu, maka perlu dilakukan penelitian terbaru mengenai stemming dalam kegiatan peledakan. Konsistensi stemming sangat penting dalam kegiatan peledakan karena mencegah fly rock, fragmentasi yang lebih baik, dan lain-lain. Stemming yang kurang maksimal selain memiliki dampak fly rock juga mengakibatkan air blast, dan bongkahan batu (boulder). Penilitian ini bertujuan untuk menganalisis dampak konsistensi kolom stemming terhadap hasil peledakan dan rekomendasi geometri peledakan berdasarkan teori R.L. Ash dan vertical energy distribution (VED). Pada penilitian ini dilakukan untuk memperoleh hasil fragmentasi batuan dan analisis regresi serta korelasi mengenai stemming dengan hasil fragmentasi untuk mengetahui hubungannya, yaitu memiliki tingkat hubungan yang sedang. Geometri peledakan yang baik, termasuk panjang dan konsistensi stemming, dapat mempengaruhi distribusi tekanan dan energi ledakan, sehingga menghasilkan fragmentasi batuan yang optimal dan konsisten. Usulan rancangan geometri peledakan berdasarkan teori R.L. Ash dan vertical energy distribution (VED) adalah burden 2,93 m, spasi 3,66 m, kedalaman lubang ledak 8,79 m, stemming 2,93 m, powder column 5,86 m, subdrilling 0,88 m, tinggi jenjang 7,91 m, VED 66%, dan RC 2,75 dengan menggunakan bahan peledak DABEX73. Peledakan yang dilakukan dengan nilai RC kurang dari 1,4 dengan VED kurang dari 80%, maka hasil peledakan cenderung tidak optimal. Hal ini berisiko menimbulkan beberapa masalah teknik seperti fragmentasi yang buruk, fly rock, produktivitas menurun, dan penggunaan bahan peledak menjadi kurang ekonomis.
Perancangan Desain Timbunan Batubara dan Pengaruhnya Terhadap Kestabilan Lereng di Sekitar ROM 4 Site DMP PT Cipta Kridatama Suparno, Fanteri Aji Dharma; Kusuma, Di Ajeng Arum; Haeruddin, Haeruddin; Aminah, Siti; Manek, Emanuel Grace; Rini, Utari Sulistyo; Mulyani, Kurnia Dewi
Jurnal Geosains dan Teknologi Vol 9, No 1 (2026)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.9.1.2026.36-47

Abstract

Peningkatan produksi batubara di PT Cipta Kridatama site Dizamatra Powerindo memerlukan penambahan area Run of Mine (ROM) untuk menampung kelebihan produksi. ROM 4 sebagai area timbunan baru belum memiliki data teknis terkait daya dukung tanah, tinggi maksimum timbunan, dan kestabilan lereng. Penelitian ini bertujuan mengkaji kondisi geoteknik ROM 4 melalui uji berat volume batubara dan Dynamic Cone Penetrometer (DCP) untuk menentukan tinggi timbunan yang optimal. Analisis kestabilan lereng dilakukan menggunakan empat metode Limit Equilibrium Method (LEM): Bishop, Janbu, Morgenstern-Price, dan Spencer. Hasil penelitian menunjukkan desain optimal timbunan ROM 4 memiliki tinggi maksimum 17 meter, sudut lereng 36°, dan kapasitas 511.594,44 ton. Nilai faktor keamanan (FK) pada kondisi statis >1,3 dan dinamis >1,1. Metode Janbu menghasilkan nilai FK terkecil dibandingkan metode lainnya. Nilai FK setelah pembebanan menurun dibanding sebelum pembebanan akibat pengaruh beban tambahan terhadap kestabilan lereng. Secara keseluruhan, lereng ROM 4 dinyatakan aman dan sesuai dengan Keputusan Menteri ESDM No. 1827/K/30/MEM/2018.
Pengaruh Aktifitas Alat Berat dan Peledakan Terhadap Stabilitas Lereng Timbunan Tambang Batubara Suparno, Fanteri Aji Dharma; Aminah, Siti; Haeruddin, Haeruddin; Rini, Utari Retno Sulistyo; Mulyani, Kurnia Dewi; Manek, Emanuel Grace; Assyarbini, Muhammad Akbar
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 31, Nomor 2 (2025)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v31i2.69177

Abstract

Open-pit mining generates voids backfilled with overburden, forming artificial slopes susceptible to landslides. Improper slope design and external factors such as heavy equipment loads, blasting vibrations, and groundwater may trigger instability. This study examines the stability of a disposal slope adjacent to the blasting zone at PT X Coal Mine in East Kalimantan, Indonesia. The research uses secondary data from PT X. including geotechnical parameters and operational details, Slope stability was evaluated via the Limit Equilibrium Method (Bishop and Morgenstern-Price) and Finite Element Method (FEM). Initial analyses revealed critical safety factors (FoS) of 0.853 (Bishop, Morgenstern-Price) and 0.520 (FEM), indicating high instability under combined dynamic and hydrogeological stresses. A slope redesign was proposed, improving FoS to 3.932 (dry) and 3.523 (wet) via Limit Equilibrium, and 1.570 (dry) and 1.370 (wet) via FEM. These value;s comply with the safety threshold (FoS ≥ 1.1) specified in KEPMEN ESDM No. 1827 K/30/MEM/2018, ensuring operational safety. The study underscores the necessity of integrating geotechnical and operational constraints in slope design to mitigate landslide risks in open-pit mining.
Implementasi Rotary Dryer dan Website Guna Meningkatan Pendapatan pada Kelompok Tani Kopi Sumber Kembang Siti Aminah; Nur Faizin; Agus Mahardiyanto
Journal of Community Development Vol. 3 No. 2 (2022): December
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/comdev.v3i2.74

Abstract

The coffee production process carried out by the Sumber Kembang Farmers Group includes seeding to marketing products in the form of ready-to-eat ground coffee. Although this group of coffee farmers is considered to be quite good, there are still some weaknesses, namely the process of drying coffee beans is still done manually, namely drying in the sun. The manual drying process is highly dependent on land area, weather, and labor. Meanwhile, the coffee beans that have been harvested must be dried as soon as possible to maintain the quality of the coffee beans. In addition, farmer groups have not utilized information technology optimally. Therefore, this service activity was carried out with the aim of increasing the productivity of coffee farming through the design and training of Rotary Dryer and increasing sales of coffee products by expanding the reach of marketing through website creation. The implementation of socialization and training was aimed at members of the Sumber Kembang coffee farmer group located in Karangpring Village, Sukorambi District, Jember Regency. After further training, namely monitoring the results of service activities, this activity needs to be carried out to ensure that the application of technology is actually implemented by the Sumber Kembang farmer group. The method of activity applied in implementing this partnership program is the method of explaining the material about the application and benefits of rotary dryer using a power point, providing tools in the form of rotary dryer, and website training, after which monitoring is carried out. After the service activities have been carried out, farmers are able to operate rotary dryer and can increase market share thereby increasing consumer demand for coffee products from the Sumber Kembang farmer group. This is indicated by data on the increase in consumer demand for coffee products, which is above 25% for each type of product.
Pengaruh Ukuran Butir terhadap Kadar Nikel Menggunakan Metode Fraksinasi dan Analisis Geokimia di Bukit Wrangler PT ANTAM UBPN Kolaka Siti Aminah; Reza Dyna Daniar; Haeruddin Haeruddin; Fanteri Aji Dharma Suparno
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 4 (2025)
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i4.917

Abstract

PT ANTAM UBPN Kolaka memiliki beberapa bukit dengan karakteristik mineral yang beragam, salah satunya adalah Bukit Wrangler. Ukuran butir tanah bervariasi di daerah ini, memengaruhi distribusi dan deposit nikel. Penelitian ini bertujuan menganalisis kandungan unsur terkait fraksi ukuran butir nikel pada zona saprolit, hubungan antara ukuran butir dan kadar nikel, serta klasifikasi ukuran butir berdasarkan Cut-off Grade (COG). Metode penelitian meliputi fraksinasi ukuran butir (-20 mm, 20 mm, 40 mm, 80 mm, 100 mm) yang dianalisis dengan metode geokimia XRF (X-Ray Fluorescence) untuk mengetahui kadar bijih nikel. Kandungan rata-rata Ni adalah 1,93% dan Fe adalah 13,75%, tertinggi terdapat pada fraksi ukuran 80 mm. Rasio Fe/Ni optimal ditemukan pada fraksi ukuran 100mm dengan kandungan rata-rata 5,78%. Penelitian padasampel di zona saprolit menunjukkan adanya hubunganberbanding lurus antara kandungan Fe dan Ni, nilai R2 = 2,46% dan MgO dengan kandungan Ni, nilai R2=1,05%, serta hubungan terbalik antara kadar SiO2 dengan kadar Ni, nilai R2 = 35,54% dan Al2 O3 dengan kadar Ni nilai R2 = 0,65%. Dari 42 sampel yang dianalisis berdasarkan COG perusahaan, 17 sampel dengan kadar Ni 1,5% - 1,79% dan Fe < 25% memenuhi kebutuhan pasar dalam negeri, sedangkan 25 sampel lainnya diproses lebih lanjut untuk menghasilkan feronikel. Kata Kunci: Analisis geokimia, Fraksinasi, Kadar nikel,Ukuran butir, Bukit Wrangler Abstract ANTAM UBPN Kolaka has several hills with diverse mineral characteristics, including Wrangler Hill. Soil grain size varies in this area, affecting nickel distribution and deposition. The research aims to analyze the elemental content related to the nickel grain size fraction in the saprolite zone, the relationship between grain size and nickel content, and the classification of grain size based on Cut-off Grade (COG). The research methods included grain size fractionation (-20 mm, 20 mm, 40 mm, 80 mm, 100 mm) analyzed by XRF (X-Ray Fluorescence) geochemical technique to determine the content of nickel ore. The analysis showed elements such as Ni, Fe, SiO2 , Mg, and Al2 O3 . The average content of Ni is 1.93% and Fe is 13.75%, the highest value was found in the 80 mm size fraction. The optimal Fe/Ni ratio was found in the 100 mm size fraction with an average content of 5.78%. The study in the saprolite zone showed a directly proportional relationship between Fe and Ni content, R2 value = 2.46% and MgO with Ni content, R2 value = 1.05%, as well as an inverse relationship between SiO2 content with Ni content, R2 value = 35.54% and Al2 O3 with Ni content, R2 value = 0.65%. Of the 42 samples analyzed based on the company’s COG, 17 samples with Ni content of 1.5% - 1.79% and Fe < 25% meet the needs of the domestic market, while the other 25 samples are further processed to produce ferronickel. Keywords: Geochemical analysis, Fractionation, Nickel content, Grain size, Wrangler Hill
Co-Authors Agus Mahardiyanto Assyarbini, Muhammad Akbar Difan Tri Andalas Emanuel G. Manek Fahreza Nanda Pristanto Fanteri Aji Dharma Suparno Haeruddin Haeruddin Januar Fery Irawan Kurnia Dewi Mulyani Kusuma, Di Ajeng Arum Miftakhul Ulum, Miftakhul Muhammad Bayu Ardyansyah Nur Faizin Nur Faizin Rachmad Kurnia Ramadhantio Mycharoka Reza Dyna Daniar Siti Fatmawati Supriyatna, Anjana Utari Retno Sulistyo Rini