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All Journal Journal of S&T Policy and R&D Management Journal of Engineering and Technological Sciences Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Ichwan Azwardi Lubis
PT. TIMAH (Persero) Tbk
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology

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A TECHNOLOGY INNOVATION TO CONSERVE TIN ALLUVIAL MINING: SUBSURFACE HYDRAULIC MINING BY BTM-SR-4 EQUIPMENT Lubis, Ichwan Azwardi; Susilo, Robertus Bambang; Romi, Sasri
Journal of S&T Policy and R&D Management Vol 12, No 2 (2014): Journal of S&T Policy and R&D Management
Publisher : Pusat Penelitian Perkembangan Iptek, LIPI

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Abstract

Nowadays, surface hydrolic mining on tin alluvial has caused conflict with other interests. Due to a big mining area needed, the activity has conflict with plantation and local people gardens. Furthermore, activity of illegal mining has destroyed tin reserve and environment as well. Once the illegal mining is not managed properly, tin reserve of the company will decrease significantly, in addition, reclamation cost that must be beared by the company will increase significantly. Approach to manage conflict through negotiation on land use has not given a signifi-cant outcome. As the result, the company experiences a very difficult situation to make a mine planning, both short term and long term. Technology of subsurface hydrolic mining offers a mine activity with minimal land clearing and avoid to open overburden. Currently, PT Timah (Persero) Tbk has succeeded to study and examine the technology through operating a pack of equipment named BTM-SR4. Besides aware-ness on environment, due to its ability to mine on spotted tin deposit, the technology is able to increase tin reserve. Other good news are to decrease mining cost due to not opening over burden and to decrease reclamation cost. All of above good points will support sustainability of the company.
Drill Hole Spacing Analysis for Evaluation of Quartz Sand Resources as Residual Material from On-Land Alluvial Tin Processing based on Global Estimation Variance and Kriging Variance, with Case Study in the Bangka and Belitung Islands, Indonesia Safitra, Roby Mardiyan; Heriawan, Mohamad Nur; Anggayana, Komang; Rubiarto, Rubiarto; Lubis, Ichwan Azwardi
Journal of Engineering and Technological Sciences Vol. 56 No. 5 (2024)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2024.56.5.9

Abstract

On-land alluvial tin mining activities produce residual materials from mineral processing or mineral washing; the major one of these is quartz sand, which can be utilized in the manufacturing industry. As time goes by, the reserves of alluvial tin are decreasing, which is in line with the increasing residual material from abundant mineral processing. Mining procedures are carried out following the Indonesian government regulations, covering mining as well as reprocessing. This motivated us to evaluate the potential of quartz sand at two mining sites in Bangka and Belitung Islands. This study evaluated alluvial tin processing residual quartz sand through drill hole spacing analysis (DHSA) by comparing two geostatistics parameters, namely global estimation variance (GEV) and kriging variance (KV). Drill hole samples were taken with varying spacing, ranging from 50 to 200 m, after which geostatistical analysis was carried out. With several simulations, the incorporation of GEV and KV was able to produce the optimal drill hole spacing with measured resource categories in the range of 40 to 55 m, indicated resources in the range of 55 to 85 m, and inferred resources >85 m. Accordingly, the total estimated quartz sand resources of both sites were obtained.
Spektroskopi Reflektansi Sampel Tanah dan Batuan yang Mengandung Mineral Pembawa Unsur Tanah Jarang dan Radioaktif Hede, Arie Naftali Hawu; Firdaus, Muhammad Anugrah; Prianata, Yogi La Ode; Heriawan, Mohamad Nur; Syafrizal; Syaeful, Heri; Lubis, Ichwan Azwardi
EKSPLORIUM Vol. 40 No. 2 (2019): NOVEMBER 2019
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2019.40.2.5644

Abstract

Reflectance spectroscopy is one of the nondestructive methods of mineral identification and is one of the basic principles in the remote sensing analysis using optical sensors. This research aimed at applying reflectance spectroscopy at 350–2,500 nm wavelength range for samples containing rare earth elements (REE) and radioactive minerals. Samples were taken from several locations in South Bangka and Mamuju that had previously been identified as potential location of REE and radioactive-bearing minerals. Reflectance data shows that there are absorption characteristics for REE-bearing minerals; monazite, zircon, and xenotime minerals especially from tailings and tin ore concentrate for the samples from South Bangka. The key wavelengths are specifically in the visible-near infrared range (VNIR; 400–1300 nm). For the samples from Mamuju, which is known as radioactive mineral prospecting areas, spectral characteristics provide information that there are spectral signatures in the shortwave infrared range (1,300–2,500 nm). The results of major mineral interpretations include clay minerals, sulfates, NH4 species, and other minerals containing Al-OH. However, some samples at the VNIR wavelength identified as iron oxide/hydroxide minerals. It is hoped that these results can be useful for REE and radioactive exploration mapping using remote sensing methods.
Co-Authors Arie Naftali Hawu Hede Firdaus, Muhammad Anugrah Heri Syaeful Heriawan, Mohamad Nur Komang Anggayana Robertus Bambang Susilo Rubiarto, Rubiarto Safitra, Roby Mardiyan Sasri Romi syafrizal Yogi La Ode Prianata