JUMPE : Journal of Mining, Mineral Processing, and Energy

POTENTIAL OF RARE EARTH ELEMENTS (REE) IN KETAPANG DISTRICT IUP PT. PANGSUMA NATURAL STONE

Sy Indra Septiansyah, Idris Herkan Afandi — Tue, 12 Dec 2023 00:00:00 +0000

This research is entitled Potential of Rare Earth Metals in Ketapang Regency, IUP PT. Pangsuma Natural Stone, with the aim of finding out the potential of Rare Earth Metals in Ketapang Regency. This research was carried out in collaboration with the Research Team and PT. Batu Alam Pangsuma where PT. Batu Alam Pangsuma has never tested the content of rare earth metals, so far PT. Batu Alam Pangsuma sells in the form of tin concentrate. Geologically, Rare Earth Element (REE) makes it possible to find it in tin mining locations, such as what happened in the Bangka Belitung tin mine, namely the minerals Zircon, Monazite and Xenotim, these minerals are the minerals that carry RRE. The research team calculated REE resources based on the level of confidence in the inferred geology. This was done because sample testing was carried out at 3 location points on in situ samples and samples that had been processed into tin concentrate. This research can be continued so as to obtain the potential of REE with measurable classification and create a mini project on the separation between REEs and tin concentrate. Based on the test results, there is a distribution of minerals in the form of metals with a percentage of Valuable Element Oxides (OUB) or referred to as concentrates in the form of Zircon minerals with a percentage of 22.03% - 65.89% levels, followed by Titanium (TiO2) with a percentage of levels of 10.54% - 38.58% and followed by other minerals in small elements. While Rare Earth Oxides (OTJ) there are several minerals, namely Scandium (Sc), Ytterbium (Yb), Yitrium (Y), Thorium (Th), Uranium (U). This shows that there is potential for rare earth metals at mining sites, namely zircon sand mining in the Ketapang Regency area.

MODIFICATION OF HAND AUGER DRILL BIT MADE FROM USED CAR SPRINGS FOR ALLUVIAL SAMPLING ACTIVITIES IN KETAPANG DISTRICT

Idris Herkan A, Ismail Marjuki, Syarifah Aqla — Tue, 12 Dec 2023 00:00:00 +0000

This research purpose was to modify a hand auger drill bit made from garnished iron which is thought to blunt easily when dealing with alluvial sand-type material with material from used car springs which is made of steel and has long-lasting sharpness when dealing with sand. Apart from that, to overcome the fall of samples when lifted, especially for saturated sand samples. Researchers also wanted to observe to what extent the incalination hand auger drill to catch material, especially saturated alluvial sand. From the result of the research, it was found that using car spring material as a hand auger drill bit has good sharpness so that the activity of rotating the hand auger for sand sampling is lighter than using hand augers sold on the market. The Inclination of hand auger drill modification at an angle of 30⁰ has better inclination saturated sand samples and is easier in removing samples from the drill tube compared to the drill bit angle of 15⁰ which cannot lift samples optimally and the drill bit of 45⁰ which has difficulty when removing samples from drill tube

EFFECT OF COMBUSTION TIME ON COMPRESSIVE STRENGTH AND WATER ABSORPTION IN RED BRICKS MADE FROM TAILINGS AND CLAY RAW

Maya Santi, Idris Herkan Afandi, Syarifah Aqla, Febriandi Febriandi — Tue, 12 Dec 2023 00:00:00 +0000

Indonesia is the sixth largest bauxite producer in the world with 98 bauxite mining business permits in Indonesia and 84 of them are in West Kalimantan. If we look at the high bauxite production every year, the potential for waste produced is no less large. From the washing process, a by-product (waste) is produced which is called bauxite tailings. The resulting bauxite tailings account for up to 50% or more of the bauxite weight before washing. Bauxite tailings have physical properties by the fine aggregate standards for building material specifications part A (SK SNI S-04-1989-F) with a grain size of (-2+0.075) mm. They can be used as a substitute for fine aggregate from the natural environment. In this research, bauxite tailings, which are waste from mining activities, are used to make a product that has added value, namely red brick. Red bricks are mostly made from clay, but in this study, bauxite tailings were used as raw material with clay as a mixture. This research aims to determine the compressive strength and air absorption values of red bricks made from bauxite tailings mixed with clay at varying firing times of 7, 14, and 21 hours. From the test results, it was found that the longer the burning time, the higher the compressive strength value but the lower the air absorption.

ANALYSIS OF THE EFFECT OF BAUXITE TAILINGS ON BASIC SOIL STABILIZATION ON MINE ROADS

Syarifah Aqla, Sartika Sartika — Tue, 12 Dec 2023 00:00:00 +0000

The condition of the subgrade on mining roads is greatly influenced by weather conditions such as rain. When it rains, the base soil layer becomes saturated. Saturated soil conditions will result in a decrease in the carrying capacity of the subgrade. A decrease in the bearing capacity of the soil can potentially cause work accidents. This research is related to improving the value of soil bearing capacity by stabilizing the subgrade using other materials. The material chosen for soil stabilization is material resulting from bauxite washing waste, namely bauxite tailings. Bauxite tailings are waste resulting from washing bauxite which still contains heavy metals, where handling this bauxite tailings waste is a problem experienced by many bauxite mining companies in West Kalimantan. This research aims to determine the type and characteristics of the subgrade of the mine road and to determine the effect of bauxite tailings on subgrade stabilization on the mine road in terms of the California Bearing Ratio (CBR) value. The results of the AASHTO soil classification system test show that the subgrade soil type of PT Cita Mineral Investindo Tbk Site Sandai mining road is included in group A-2-6 (0), namely gravel and sand soil types containing silt and clay. The results of the California Bearing Ratio (CBR) test calculation show that, as the mixture of bauxite tailings increases in the subgrade of the mine road, the CBR value decreases. Therefore, it is recommended to add other materials as soil stabilization materials.

ANALYSIS OF WATER DISCHARGE IN THE WATERSHED OF SUNGAI KELIK VILLAGE

Herman, Firman — Sun, 31 Dec 2023 00:00:00 +0000

Rivers are a vital natural resource for humans and the environment. One of the factors affecting a region's ability to absorb water is changes in land cover, water discharge, and rainfall. Sungai Kelik Village is an area that experiences annual flooding. This study aims to analyze the river discharge in Sungai Kelik Village to determine the planned flood discharge for the area using the Rational Method approach. The results of the study show an increase in the planned flood discharge between 2013 and 2023, driven by changes in land cover functions. The measured river discharge is 271.5 m³/s, and the planned flood discharge is 644.88 m³/s for 2023, indicating a potential for future flooding. Therefore, environmental conservation efforts are needed, including reducing land clearing in the area around the watershed of Sungai Kelik Village.