PROMINE <hr> <div><strong>p-ISSN 2354-7316&nbsp;</strong><em>(Media Print)</em></div> <div><strong>e-ISSN 2620-7737&nbsp;</strong><em>(Media Online)</em></div> <div align="justify"><strong>PROMINE</strong> is a scientific periodical publication of the Department of Mining Engineering, Bangka Belitung University, which is published every <strong>June</strong> and <strong>December</strong> in a year which covers the fields of Exploration (Geology and Geophysics), Geotechnical / Geomechanics, Minerba Processing, Mining Environment, Reclamation and Post-Mining.</div> <div align="justify"><strong>PROMINE</strong> has become a journal accredited by the Ministry of Research, Technology and Higher Education based on Number SK 36/E/KPT/2019 about the Results of Scientific Journal Accreditation in Period VII of 2019 . Defined as an accredited scientific journal ranked 4. Accreditation is valid for 5 (five) years of Vol. 5 No.2, 2018 until Vol. 10 No.1, 2023.</div> en-US (Guskarnali, S.T., M.T) (Irvani, S.T., M.Eng) Wed, 25 Dec 2019 00:00:00 +0000 OJS 60 Heavy Metal Content Study in River Sediments in Traditional Gold Mining Locations, Boto Village, Jatiroto District <p>Traditional and small-scale gold mining, known as ASGM (Small Scale Gold Mining), has been approved for<br>pollution of the environment specifically for watersheds. This research was conducted in Boto Village,<br>Jatiroto Subdistrict, Wonogiri Regency, Central Java Province. This study discusses the analysis of<br>composition and heavy metals and the factors that support heavy metals in the study site. The samples<br>taken were 22 samples along the river flow in the upstream and downstream areas. Tests of content were<br>not carried out by the ICP-AES method. Laboratory test results on river sediment samples were then<br>analyzed statistically, geoaccumulation index and enrichment factors were calculated. Laboratory test results<br>show that most do not have heavy metal content exceeding the average concentration of heavy metals in<br>river sediments. The spread of heavy metals in river sediments in the study sites was found to be varied with<br>differences in the upstream and downstream areas. In general, upstream areas have higher metal reserves<br>compared to downstream. Distribution of heavy metals for everything that has not been planned, is<br>processed by natural processes or human activities. Traditional mining activities contribute significantly in<br>contributing to the addition of Hg, as well as contributing to the increase of other metals, most of which are in<br>the mineralized area, which fully contains high metal reserves.</p> Efendi Putra Dwijaya Pa, Wawan Budianta, Doni Prakasa Eka Putra ##submission.copyrightStatement## Wed, 25 Dec 2019 00:00:00 +0000 Design Of Magnetic Separator To Increase Tin Ore Content In Mining Laboratory Bangka Belitung University <p>Magnetic separator testing uses two variables, namely the speed of the roller on the conveyor belt and<br>the feed speed. Due to the minimum number of variations that can be used in magnetic separator<br>testing, roller speed testing is used at 0.6 m / s and 0.7 m / s. the variation of figures at the feeding<br>speed of 0.21 kg / s and 0.35 kg / s so that 8 samples obtained from the processing of a magnetic<br>separator with 4 magnetic samples and 4 non-magnetic samples. The feed samples used were<br>prepared by drying and sifting into 3 size fractions to be used in the grain counting analysis process so<br>that the percentage of minerals contained in the sample were found: 15.82% Cassiterite, 63.95%<br>Ilmenite, 6.09% Monazite, 0.48% Pyrite / Marcasite, 1.61% Zircon, 1.44% Topaz, 0.65% Tourmaline<br>and 9.96% Quartz. The effect of roller speed on the increase tin ore content is still common, this is<br>because there are not many experiments carried out so that taking the trend of the influence of the<br>roller speed is too fast. The effect of feed speed, the greater the feed speed on the magnetic<br>separator, the smaller the tin ore content obtained.</p> Janiar Pitulima, E.P.S.B Tamantono E.P.S.B Tamantono, Haslen Oktarianty ##submission.copyrightStatement## Wed, 25 Dec 2019 00:00:00 +0000 Analysis of Mercury Content (Hg) in Lake Payawan Gold Mining Area Tumbang Panggo Village, Tasik Payawan District Katingan Regency <p>Field activities conducted to determine the level of mercury content in the water flow of Lake Payawan,<br>Tumbang Panggo Village, Tasik Payawan District, Katingan Regency, Central Kalimantan Province<br>based on laboratory test results to obtain the results of mercury content in upstream to downstream of<br>Lake Payawan. From this research, it is necessary to test the quality of water in the laboratory in order<br>to analyze the water quality parameters so it can be known mercury content (Hg) in Lake Payawan<br>water flow. From the test results on 6 points river water samples in the laboratory of the Industrial<br>Research and Standardization Center of Banjarbaru City showed the highest mercury content found in<br>sample number 3 with P. 2076 test code taken at the location of the middle Lake Payawan Tasik<br>Payawan District with mercury levels located At a rate of 0.069 μg / l or 0.000069 mg / l, this reflects<br>the presence of other factors that may also affect the level of mercury content in Lake Payawan flow.</p> Fahrul Indrajaya, Lisa Virgiyanti ##submission.copyrightStatement## Wed, 25 Dec 2019 00:00:00 +0000 Competency Enhancement of Local Community in Trass Utilization in Nagreg Kendan, Bandung, West Java <p>Competency enhancement in trass utilization was given to local communities of Nagreg Kendan,<br>Bandung, West Java. This activity was intended to explore the potential of local cummunity in<br>developing trass deposit utilization for local economy. This activity is expected to provide<br>recommendation and encouragement for local community to develop entrepreneurship in utilizing and<br>managing mineral resources potential. This activity was divided into several parts, they are pre-test,<br>counseling and discussion about trass utilization, and also post-test to evaluate local community’s<br>basic knowledge. Local community shows good knowledge and enthusiasm of local community in<br>developing local economy through trass utilization.</p> Sri Widayati, Dudi nasrudin Usman, Sriyanti Sriyanti, HimawaN Nuryahya, Ike J. Triwardhani ##submission.copyrightStatement## Wed, 25 Dec 2019 00:00:00 +0000 Slope Stability Analysis Based on Rock Mass Shear Strength on Changes in Water Content in Coal Mining in the Menyango Block Area <p>Mining activities is commonly to work with the problem of stability of rock mass, then befor<br>desaining mine’s slope should know rock shear strength parameters, such as cohesion (c) and<br>internal friction angle value ( . Beside those parameters, also needed to know the impact of<br>water content to the rocks. The water content will effect rock’s shear strength, proof by the rock<br>condition which is ductile when it is dry and soft when it is wet. Based on test results was done<br>using sandstone with laboratory scale of direct shear test were analyzed using mohr – coulomb<br>and patton criteria (1966). It is known that the cohesion (c) of sandstone decreased from 510,35<br>kPa at natural condition down to 133,75 kPa at wet condition. The internal friction angle ( ) also<br>decreased from 54,56° at natural condition down to 48,45° at wet condition. The reduction of the<br>shear strength is caused by fragments and clay minerals characteristics which are so reactive<br>and very easy to absorb water so that the cohesion of the sandstone reduce the active normal<br>stress so that working the shear stress required to cause the shear failure become<br>weaker. From the results, it is also known that the shear surface roughness had a lot of<br>influence on the shear strength the normal stresses applied on the direct shear tests were<br>very low under 20% of UCS.</p> Novandri Kusuma Wardana ##submission.copyrightStatement## Wed, 25 Dec 2019 00:00:00 +0000