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"Evaluasi terhadap pengusahaan pertambangan hatuhara arialab untuk mengetahui perkembangan penyelenggaraan usaha pertambangan uatubara di Indonesia. Hal ini dilakukan guna mendapatkan gambaran atas pasang-surutnya industri pertambangan batubara dalam rangka pelaksanaan Otonomi Daerah.Pelaksanaan Otonomi Daerah akan memberikan kewenangan yang lebih luas kepada Pemerintah Kabupaten/Kota, yang lebih terbatas kepada Pemerintah Propinsi dan Pemerintah Pusat. Disini terjadi perpindahan kewenangan yang dulunya merupakan kewenangan Pemerintah Pusat bergeser menjadi kewenangan Pemerintah Daerah dengan segala konsekuensinya.Penelitian akan dilakukan dengan tujuan untuk mengetahui perkembangan usaha pertambangan batubara pada saat ini dibandingkan dengan pada saat sebelurn pelaksanaan otonomi. Kemudian mengkaji guna mendapatkan snafu strategi didalam pengelolaan pengusahaan pertambangan batubara yang tepat agar adanya pergeseran paradigma dari sentralistik ke desentralistik tidak sampai mengganggu kelangsungan investasi pada sub sektor pertambangan batubara.Kajian dilakukan dengan metode Analytical Hierarchy Process (AHP). Data-data didapat dengan cara studi literatur, dan kuesioner serta diskusi. Kemudian membangun hirarki yang tersusun dari empat level terdiri ats tujuan. faktor/kriteria, sub faktor/kriteria serta alternatif.

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The evaluation on the coal mining business is to identify the development of the coal mining business in Indonesia. The evaluation is carried out to get u description on the up-down of the coal mining industries with connection with the Local Autonomy.The enactment of local autonomy will give more authorities to the regency and municipality government, and less authorities to the provincial and central government. There is a shift of the authorities from the central government to local governments with all its consequences.The objective of this research is to identify the development of coal mining business at present compared to that of before the enactment of the local autonomy.A study is carried to formulate a proper strategy in coal mining b'.lsiness management so as to achieve a new paradigm from centralistic to decentralistic in order not to hinder the sustainability of the investment in coal mining sub-sector.The study is carried out under the Analytical Hierarchy Process (Al-IP). The data is collected by the literature study, questionnaires and discussion. A structured hierarchy of four levels consisting of objectives, factors/criteria, subfactor/criteria and alternatives is formulated."

"The intrusive rocks of Gunung Parang and Gunung Bongkok appear to be boss shape. The intrusion lie physiographically at the Bogor zone, Purwakarta area, West Java. Petrographic features show that the rocks have good porphyritic textures, and primary minerals of plagioclase, pyroxene, and hornblende as phenocryst are in groundmass made of crystallites plagioclase. This ranges from calcic andesine, and subordinate sodic to calcic labradorite, especially in the intrusive rocks of Gunung Bongkok. Chemical analyses reveal that the parent magma of these rocks is high-alumina basalt derived from olivine tholeiites fractionation at the depth of 44 km and the temperature 1066 degree Celcius while the depth of parent magma is calculated about 175 km to the depth of the undergoing Benioff zone."

"Separation and purification of yttrium from several rare earth elements available in rare earth mineral xenotime employing combined separation methods. In this study, rare earth mixtures and reagent grade synthetic materials were used instead of actual origin xenotime mineral samples. The concentration ration of each rare earth in the mixture was proportional to that of the rare earth mineral xenotime found on Bangka Island. Crystals of yytrium with a purity of 99,9% were obtained which indicates a successful separation of yttrium from the rare earth elements."

"This paper attempts to clarify the position of geological and mining conditions at Ombilin in comparison with those in Australia and the UK by examining both the technical strategy and its efficiency. A summary of this review is made to facilitate judgments on long wall layouts and strata control matters chosen during the stage of mine planning and design for purpose of the underground coal mine development in Indonesia."

"Over the years, explosives have been developed of various types and with special techniques. The situation is changing everyday; better, safer products are on the market with improved procedures for use. Simple common points which are often overlooked are stressed in this paper. Both fragmentation and safety can be improved by following proper procedures in loading boreholes. Proper loading procedures such as primer location, borerehole sealing, decking, and stemming are presented. Discussion follows on the use of each procedure in surface coal mines, open-pit, and quarries."

"A potential coal deposit has been identified during detailed coal exploration campaign carried out by the Directorate General of Mines coordinating with the NEDO in Napal, Central Sumatera. Eight coal seams were found in the Upper Miocene formation, with horizontal dips. Considering the fact, a big open pit coal mining operation is possible to be planned in Napal."

"The mineral content of Indonesian coal is typically low with the average of 5.2%. Pyrite occur in most coals but in areas currently being mined are low. Some of the Pasir and Berau coals in East Kalimantan have moderate to high sulphur content in some plies and this indicates some marine influence."

"An observation has been conducted to find weakness on jaw crusher made by Nagreg residents. This equipment was tested using limestone and granite rocks as the feed. The equipment has several weakness which can be modified such as jaw position, jaw surface, the unavailability of hopper in the upper mouth opening, and track for the belt, and equipment construction is also rather weak. It is suggested that the equipment should be built in knock down system in facilitating the equipment transportation. With respect to the large blasting product, there is a possibility to develop this equipment into primary and secondary crusher."