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Indonesian Mining Journal

imj
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Published by PUSLITBANG Teknologi Mineral dan Batubara

ISSN : 08549931 EISSN : 25278797 DOI : -

Core Subject : Science, Social, Engineering,

Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Environmental Science

This Journal is published periodically two times annually : April and October, containing papers of research and development for mineral and coal, including exploration, exploitation, processing, utilization, environment, economics and policy. The editors only accept relevant papers with the substance of this publication.

Arjuna Subject : -

Articles 272 Documents

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MANAGING THE PROBLEMS OF ARTISANAL AND SMALL-SCALE GOLD MINING AT SEKOTONG AREA, WEST LOMBOK BAMBANG YUNIANTO
Indonesian Mining Journal Vol 15, No 2 (2012): INDONESIAN MINING JOURNAL Vol. 15 No. 2 June 2012
Publisher : Puslitbang tekMIRA

Artisanal and small-scale mining of gold at Sekotong area, West Lombok is conducted illegally. This gold mining is one of the examples of the mining in this country that retains the issue root of social, economic and cultural community. This paper tries to assess the issue and its solution based on the survey result of the current issues team from the R&D Centre of Mineral and Coal Technology. Based on the assessment relating to the policy of regional spatial plan, the gold potential in the area should be allocated partly for the artisanal and small-scale mining (WPR) in accordance with Law Number 4 Year 2009. In the earlier growth, the mining needs guidance, education and training in either capital aspect, business or mining technique. That is why, the role of the regional government is absolutely required.

COASTAL CHARACTERISTICS OF IRON SAND DEPOSITS IN INDONESIA HANANTO KURNIO
Indonesian Mining Journal Vol 10, No 3 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 3 October 2007
Publisher : Puslitbang tekMIRA

Coastal features of Indonesia are controlled by the geology and geomorphology of the hinterland and the bordering adjacent marine environments. Tectonic instability manifested as frequent earthquakes combined with volcanic eruptions and sea level changes also affect Indonesian coastline. Unstable air and heavy rainfall zone known as intertropical convergence zone (ITC) which migrates to the north and south of the equator together with orographic factor of mountain ranges in Sumatra, Java and Nusatenggara are also controlling coastal landforms. Large sediment quantities resulted from a com- bination of deeply weathered rock in steep elevated hinterlands and frequent heavy rainfall are trans- ported to the coast and built extensive deltas and broad coastal plains. Iron sands in Sumatra, Java, Bali and Nusatenggara Islands are largely derived from denudation of andesite and old andesite forma- tion enriched in magnetite and ilmenite minerals. In certain cases periodic eruptions of active volca- noes supply fluvial sand to maintain the prograding shoreline. Wave regime in Indonesian coastal waters resulted from strong swells of Indian Ocean in the south and Pacific Ocean in the northeast has much influence various coastal features. Coastal zones especially the southern parts of the Neogene Sunda Banda magmatic arc are the area of potential and producing iron sand deposits which extend from northern Sumatra to eastern Indonesia. Beach sediments enriched in magnetic minerals of such coastal zones are typically black or grey. The iron sand deposits have been mined either by state company or by local people. Small scale mining helps to improve the economy of the commu- nity. Application of regulations and good guidances of these artisanal minings will not destructive to the natural environments.

GOLD RECOVERY OF REFRACTORY SULFIDE CONCENTRATES USING DIRECT CYANIDE LEACHING WITH NITRITE AS AN OXIDANT Suratman Suratman
Indonesian Mining Journal Vol 19, No 3 (2016): INDONESIAN MINING JOURNAL VOL. 19 NO. 3, October 2016
Publisher : Puslitbang tekMIRA

The problem of refractory sulfide gold ore that has a gold recovery less than 50% when direct cyanidation applied, still exists until now. It needs oxidative pretreatment for cyanidation to be effective in gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was performed at 20%-w/w of solid (500 gram of refractory sulfide gold ore concentrate) in a 2.5-liter glass reactor with aeration and stirred at 250 rpm. Leach solutions were prepared using deionized-distilled water at the prescribed concentration of reagents. Recovery of gold increased gradually to its maximum value of 93.05% as the value of cyanide strength increased from 0.8 to 1.2% and the addition of sodium nitrite raise to 1.2 M. No improvement for further addition of nitrites. This introduction of new hydrometallurgical pre-treatment process has given more option for treating refractory ores.

THE EFFECT OF DISPERSING AND STABILIZING ADDITIVE ON THE STABILITY OF UPGRADED COAL WATER MIXTURE DATIN F. UMAR; BUKIN DAULAY; HIROMOTO USUI; YOSHIYUKI KOMODA
Indonesian Mining Journal Vol 10, No 1 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 1 February 2007
Publisher : Puslitbang tekMIRA

The upgraded brown coal water mixture (UBCWM) stability with several dispersing and stabilizing additives was studied based on coal sedimentation time history. UBCWM was filled up in a settling column; which has four holes in the upper, upper middle, bottom middle and middle side to take samples. Results indicate that the addition of Naphthalene sulfonate formaldehyde condensate (NSF) as dispersant together with S-194 some kinds of bio polysacharide with long branches produced by Dainippon Pharmaceutical Co. Ltd. as stabilizer, produces UBCWM with the best stability compare with that by using polystyrene sulfonate (PSS) and polymethacrylate (PMA) together with carboxyl methyl cellulose (CMC) and S-60 also some kinds of bio polysacharide, but without branches pro- duced by Dainippon Pharmaceutical Co. Ltd . Even the addition of S-194 results UBCWM with good stability, from the economical point of view, the addition of S-194 is a problem. The price of S-194 is expensive, whereas CMC is abundant and cheap. Therefore, the use of CMC as stabilizing additive was also effective in preparing stable UBCWM according to the stability of the UBCWM by using S- 194 and CMC is not significantly different.

TIN-BASED ALLOY FOR FUEL CATALYST Siti Rochani; Pramusanti Pramusanto; Retno Damayanti
Indonesian Mining Journal Vol 16, No 1 (2013): INDONESIAN MINING JOURNAL Vol. 16 No. 1 February 2013
Publisher : Puslitbang tekMIRA

Tin-based fuel catalyst, if dipped into a gasoline-containing tank will increase fuel efficiency. The catalyst has been used since 60 years ago. Its usage will save the fuel and increase the use of tin as expected by tin-producers. Though the mechanism of catalytic reaction has not been clearly understood, several research regarding catalyst performance have been conducted. Moreover some companies have already produced such a catalyst. The tin alloy catalyst was made by melting tin and other metals at specific compositions in a burner and casted into dif- ferent shapes. In term of evaluating the contact between the fuel and the catalyst as well as assessing the alloy catalytic mechanism, the samples were dipped in gasoline and stirred for 3 days. The gasoline with and without catalyst were analyzed using infrared and showed that the spectra appeared at 875, 835, 538, 343 and 229 cm-1 after 3-day dipped. The peaks resulted for catalytic interaction between Sn and gasoline. Fuel efficiency was measured through static and dynamic tests. The former was conducted using a genset and lawn mower by running the diesel-containing engines in empty load condition. The result showed that efficiency of catalyst-containing diesel consumption was still low, ranged between 0.6 - 5%. Other static tests were performed at LEMIGAS using Toyota and Isuzu car engines. Using gasoline and diesel respectively. Effect of catalyst on the car with gasoline improves engine capacity to 8.79%, and increases fuel consumption to 1.03%. The catalyst applied the car with diesel enhances the capacity to 11.38 % and increases fuel consumption to 9.39%. Dynamic tests conducted to motor bikes and cars show the efficiency of fuel consumption around 5-17.5%. It means that tin-alloys based catalyst for efficiency of fuel use is prospective. Such a catalyst is easy to be made and utilized.

THE INFLUENCE OF ACTIVATED ZEOLITE ON THE DECREASING OF NH3 CONCENTRATION IN FISH POND WATER Daman Suyadi; M. Ulum A. Gani
Indonesian Mining Journal Vol 11, No 1 (2008): INDONESIAN MINING JOURNAL Vol. 11 No. 1 February 2008
Publisher : Puslitbang tekMIRA

A research on the utilization of zeolite from Tadisi Village, Sumarorang, Polmas, West Sulawesi had been carried out. The objective of this research is to identify the influence of activated zeolite both physically and chemically on the decreasing of NH3 concentration in fish pond water. The physical activation in this research was done by heating of zeolite samples at the temperature of 100, 200 and 300°C , while the chemical activation was carried out by using reagent of NaOH with the concentration of 2 N. The particle size of the zeolite used in this research was – 4 + 10 mesh and the weight of activated zeolite samples put into the fish pond water samples were 1; 5; and 10 grams with contact time of 0, 1, and 5 days, respectively. The optimal result of this research indicated that by the addition of 5 grams of the activated zeolite (which had been activated at the temperature of 300°C with contact time for one day), the NH3 concen- tration of fish pond water samples decreased as much as 54.97 %. The addition 10 grams of the activated zeolite (which had been activated by NaOH with concentration of 2 N with contact time for five days showed the optimum result by decreasing of the NH3 concentration in fish pond water samples as much as 45.01 %.

STIRRING AND NON-STIRRING METHODS USED TO MAKE SYNTHETIC DOLOMITE-BASED EPSOM SALT TATANG WAHYUDI; BUDHY AGUNG
Indonesian Mining Journal Vol 9, No 1 (2006): INDONESIAN MINING JOURNAL Vol. 09 No. 1 February 2006
Publisher : Puslitbang tekMIRA

The increasing need of magnesium sulfate heptahidrat by various industries and the limited availabil- ity of this material in nature are two reasons to produce MgSO4.7H2O synthetically. Basically, such a material can be produced from dolomite. A laboratory scale of dolomite-based epsomite making which employed two crystallization processes was conducted. Those were stirring and non-stirring methods and the results showed that stirring one yielded 98.2312 to 98.7244 % MgSO4.7H2O salt. The non-stirring method produced salts of 97.5929 – 99.0378%. Yet prior to salt processing, magne- sium sulfate solution was evaporated at 100 – 110°C to get solution densities around 1.35, 1.38 and1.4 g/ml. The bigger the density the bigger the MgO and SO3 contents

APPLICATION OF SIMPLE DISPLACEMENT MONITORING SYSTEM FOR ROCK/SOIL MOVEMENT AT BINUNGAN MINE OPERATION OF PT. BERAU COAL ZULFAHMI ZULFAHMI
Indonesian Mining Journal Vol 10, No 2 (2007): INDONESIAN MINING JOURNAL Vol. 10 No. 2 June 2007
Publisher : Puslitbang tekMIRA

This monitoring result illustrates the real slope stability and could be used as datat for back analysis to obtain the real shear strength (c and ö).Study of monitoring system application to detect soil/rock movement at mine slope was conducted bya team from tekMIRA in 2006. The location of trial run was Binungan Mine Operation, PT. Berau Coal. The team used combinations of simple, accurate and relatively low cost monitoring equipment consists of radio modem, data logger and potential trans- ducer. Potential transducers were connected to the observation points using a wire line. When the movement occurs along the mine slope, the wire line will cause a difference potentiometer voltage. The results show a good value of linearity with value of r-square between 0.964 and 0.98

POLICY ON INDUSTRIAL MINERAL RESOURCE MANAGEMENT IN FRAMEWORK OF ELIMINATING DEPENDENCE ON IMPORT DARSA PERMANA
Indonesian Mining Journal Vol 13, No 3 (2010): INDONESIAN MINING JOURNAL Vol. 13 No. 3 October 2010
Publisher : Puslitbang tekMIRA

Indonesia is one of the countries in the world that has abundant industrial mineral resource. Known as an exporter, Indonesia in fact also becomes an importer of various industrial minerals in a big and increasing amount from year to year. This is an apprehensive condition considering the negative impact given to the economy due to the absorption of the country’s foreign exchange. It also causes higher dependence on imported material and decreasing job opportunity for the people. Actually, industrial mineral mining does not need high technology and big investment; it is also of low risk. The problem is that the import rate is stagnantly high and it is caused especially by factors of unwise policy and conflict of interest from decision makers. The problem solution has to be derived around the issue. The issuance of Law No. 4 Year 2009 on Mineral and Coal Mining is expected to become the critical moment for reforming the policy and related regulations.

EFFECTS OF TEMPERATURE AND NUTRIENT FEED ON THE PRODUCTION OF OXALIC ACID BY ASPERGILLUS NIGER SRI HANDAYANI
Indonesian Mining Journal Vol 14, No 3 (2011): INDONESIAN MINING JOURNAL Vol. 14 No. 3 October 2011
Publisher : Puslitbang tekMIRA

Oxalic acid is an important organic material used for rare earth metal extraction precipitator, metallic equip- ment purificant and purification of industrial minerals. Aspergillus niger is known to be able to produce a high concentration of oxalic acid using glucose as carbon and energy sources. For further process optimiza- tion, submerged fermentation experiments were carried out to study the effect of temperature and nutrient feed on the production of oxalic acid from medium containing glucose 35g/L. An increase in temperature process from 25 to 30°C allowed the productivity to significantly increase from 75.50 to 81.06% of theoretical yield with a final oxalic acid concentration of 17.04 g/L reached after 9 days of process. When operating at more controlled fermentor with fed-batch system, both productivity and oxalic acid concentration were markedly improved (88.01% of theoretical yield and 19.52 g/L respectively). The later system gave excel- lent yield almost 90% of theoretical yield as a prerequisite of economical value.

Page 15 of 28 | Total Record : 272

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Home Page

OAI Link

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Abstract

Abstract

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Abstract

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Abstract

Contact Name
Bachtiar Efendi

Contact Email
bachtaireaje@gmail.com

Phone
-

Journal Mail Official
umar.antana@esdm.go.id

Editorial Address
-

Location
Kota bandung,

Jawa barat

INDONESIA