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All Journal Justek : Jurnal Sains Dan Teknologi Community Empowerment
Deni, Andri Van
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Arts Humanities Computer Science & IT Control & Systems Engineering Education Mathematics Public Health Social Sciences

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Investigation of Rare Earth Elements from Coal-Derived Minerals of Sawahlunto Formation and Leaching Behavior Under NaOH and HCl Washing Treatment Algifari, Arif; Nauli, Fitri; Deni, Andri Van; Aisyah, Siti; Syakira, Dwi Wulan
Justek : Jurnal Sains dan Teknologi Vol 8, No 4 (2025): December
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v8i4.33908

Abstract

The growing demand for rare earth elements (REE) in modern technological applications has encouraged the exploration of alternative REE sources, including minerals associated with coal. This study aims to evaluate the potential of minerals in the Sawahlunto Formation coal from the Ombilin Basin as a secondary REE source through an alkaline leaching approach. Coal samples from the Sawahlunto Formation were subjected to alkaline leaching using sodium hydroxide solutions of 200–600 g/L at temperatures of 38–78 °C for 0.5–1.5 hours, followed by an acid-washing stage using 14% hydrochloric acid. X-ray fluorescence analysis identified yttrium, lanthanum, and cesium, with a total initial REE content of approximately 181 ppm. The leaching results show that under optimal conditions 400 g/L NaOH, 78 °C, and a particle size of 60/70 mesh, the residual REE content decreased to 2 ppm, indicating effective dissolution of REE-bearing mineral components. Subsequent acid washing further enhanced REE recovery by removing remaining soluble phases. These results demonstrate that coal from the Sawahlunto Formation possesses promising characteristics as a secondary REE source.
Developing Bikan Waterfall geotourism through community-based tourism (CBT): Empowerment of the local tourism awareness group Marlina A, Riam; Anaperta, Yoszi Mingsi; Aditya, Fariz; Heriawan, Rangga Agung Pribadi; Deni, Andri Van; Jesicel, William
Community Empowerment Vol 10 No 12 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.15352

Abstract

Bikan Waterfall within the Rantih Geosite, Sawahlunto, possesses significant geological value from the Tertiary Ombilin Formation, offering high scientific and educational potential. However, its development is hindered by limited community capacity and a lack of geological interpretation facilities. This community service program aims to strengthen the capacity of the local Tourism Awareness Group (Pokdarwis) through a Community-Based Tourism (CBT) approach. The methodology involves participatory observation, educational geotourism socialization, environmental conservation actions, and the installation of geological interpretive signboards. The results demonstrate a significant increase in community geotourism literacy, the formulation of a CBT-based management strategy, and the availability of interpretive facilities that enhance the site's educational function. This initiative proves that the synergy between geological conservation and local participation effectively increases the competitiveness of Bikan Waterfall as a sustainable geotourism destination.
Co-Authors Algifari, Arif Fariz Aditya Jesicel, William Marlina A, Riam Nauli, Fitri Rangga Agung Pribadi Heriawan Siti Aisyah Syakira, Dwi Wulan Yoszi Mingsi Anaperta