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All Journal Journal of Geology and Exploration
Anshariah Anshariah
Universitas Muslim Indonesia
Earth & Planetary Sciences Engineering

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Calculation of PIT 4 Coal Reserves with Cross-Cross Method Shabiruddin Shabiruddin; Anshariah Anshariah; Hasbi Bakri
Journal of Geology and Exploration Vol. 1 No. 1 (2022): Journal of Geology and Exploration, June 2022
Publisher : CV Insight Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (253.064 KB) | DOI: 10.58227/jge.v1i1.4

Abstract

Calculating coal reserves using the vertical section method can describe the condition of deposits and overburden in each section. This study aimed to determine the direction of coal distribution, the volume of overburden, and the volume of coal using the cross-section method and to obtain the stripping ratio (SR). In this research activity, data is needed in the form of documentation on pit 4, cross-section, drill logs, and coordinates of drill points. After all the data has been collected, it is continued by making a cross-section in the form of a horizontal (cross-section) using Auto Cad software. The final stage of the interpretation of the two data results is calculating the number of coal reserves, the amount of overburden (OB), and the stripping ratio value by the concept of continuity that has been carried out from the existing data.
Characteristics of Epithermal Mineralization in Block Jalur 7 Bolaang Mongondow Regency, North Sulawesi Firdaus F; Niciawati Dg Malureng; Hasbi Bakri; Muhamad Hardin Wakila; Anshariah Anshariah; Rizky Nurul Aulia
Journal of Geology and Exploration Vol. 4 No. 2 (2025): Journal of Geology and Exploration, December 2025
Publisher : CV Insight Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58227/jge.v4i2.250

Abstract

Indonesia has the potential as an area containing large reserves of gold and sulfide minerals. One of the areas with the potential to produce gold is Bolaang Mongondow Regency, North Sulawesi Province. This study aims to identify the characteristics of epithermal deposition mineralization, including texture and the presence of mineralization, to determine its paragenesis. The analysis methods used are petrography, mineralogy, and X-ray Diffraction (XRD). As many as six samples in the test well are described megascopically and polarization microscopically, which have been ground into clay-sized fractions and analyzed using the X-ray Diffraction (XRD) method to detect clay minerals and other altered mineral associations. The quartz texture present at the research location based on megascopic observations is generally dominated by saccharoidal, vuggy, mold, banded, and chalcedonic textures. The identified minerals are generally dominated by base metal minerals, with paragenesis in sequence being pyrite, chalcopyrite, galena, hematite, ilmenite, and geothite. Alterations in the research area are in the form of Argillic, Silicic, Silica-Carbonate, and propylitic zones. The study's results concluded that the type of mineralization in Bolaang Mongondow Regency, North Sulawesi, is of the low-sulfidation epithermal type.
Co-Authors Bakri, Hasbi Firdaus F Niciawati Dg Malureng Rizky Nurul Aulia Shabiruddin Shabiruddin Wakila, Muhammad Hardin