Jurnal Puslitbang tekMira (Teknologi Mineral dan Batubara)
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STABILITY STUDY OF OPEN MINE SLOPES AT PIT 22 GN PT KITADIN SITE EMBALUT, KUTAI KARTANEGARA REGENCY, EAST KALIMANTAN PROVINCE
No full textThe stability of slope, both on the slope of work and the final slope, is a very important aspect of slope stability, both on the slope of work and the final slope in open pit mining activities. The inconsistency of the slopes will result in the collapse of rocks around the excavation site. This happens because the condition of the rock when it has not been excavated is generally balanced. However, due to the discontinuous patterns that occur other than naturally and also due to the mining activities such as excavation, blasting and others, cause a reduction in the retaining force of the rock on the slope results in the equilibrium of the force tends to shift and is not balanced. Study of the stability of the open pit highwall slope at PIT 22 GN PT Kitadin Site Embalut, Kutai Kartanegara Regency, East Kalimantan Province was carried out with the aim to know the rock characteristics, to calculate slope geometry stable safety factors, and to recognize the type of landslide using a bishop method. The results of the modeling consist of several heights and slopes, as well as angles that is formed. Section AA’ has a safety factor value of 1.387, section BB has a safety factor of 1.482, section BB' has a safety factor value of 1.390, section DD' has a safety factor value of 1.318, section EE has a safety factor value of 2,381, section FF' has a safety factor value of 2.426, section GG' has a safety factor value of 2.424, section HH 'has a safety factor value of 2.339
LITHOGEOCHEMICAL EXPLORATION FOR DELINEATING PRIMARY GOLD OCCURRENCES IN WEST KAO AREA, NORTH HALMAHERA DISTRICT, NORTH MALUKU PROVINCE
Get PDFHalmahera Island retains several gold deposits. One of the gold deposits is called as low sulphidation epithermal (LSE) quartz veins which is currently being mined and is situated in the Gosowong goldfield. The veins mostly originated in N-S and NNE-SSW direction. This study is aimed to determine the prospect area in the northern portion of Gosowong goldfield covering the West Kao sub district based on surface mapping and rock/float- and BLEG stream sediment survey. A total of 16 rock/vein float and 120 BLEG samples were analyzed by FA/AAS and CNO2 cyanide leach methods, respectively. The study area is occupied by tuffaceous sandstone, andesite, porphyritic andesite and lava andesite units. In the eastern part, tuffaceous sandstone is suffered from argillic and propylitic alteration, which may be controlled by the NW-SE-trending structures. The gold grade of rock/float samples is up to 0.044 ppm. BLEG data indicates a calculated threshold of 10 ppb for Au and 72 ppb for Ag. The highest Au and Ag contents (anomalies) are identified in the eastern part of the study area. This is spatially (and maybe genetically) related to the argillic-altered tuffaceous sandstone, structures and occurrences of quartz vein floats. To follow up this finding, a detailed exploration is recommended to be conducted within the prospect area
PENGARUH INTRUSI TERHADAP LAPISAN BATUBARA E (KELADI) FORMASI MUARA ENIM, SUB-CEKUNGAN PALEMBANG SELATAN, SUMATERA SELATAN
No full textPenelitian ini dilakukan untuk mengetahui karakteristik Lapisan Batubara E dan pengaruh struktur geologi/intrusi batuan beku terhadap parameter kualitas lapisan batubara tersebut di Sub-cekungan Palembang Selatan. Informasi mengenai karakteristik kualitas lapisan batubara ini masih sangat minim, karena berada jauh di bawah permukaan bumi, sehingga menyulitkan untuk diteliti secara komprehensif. Hal tersebut berbeda dengan Lapisan Batubara A1, A2, B1, B2, dan C yang sudah banyak diteliti oleh peneliti terdahulu, karena lapisan tersebut tersingkap di permukaan, sehingga mudah untuk diteliti. Penelitian ini bertujuan untuk mengorelasikan kualitas Lapisan Batubara E dengan struktur geologi. Struktur tersebut berupa sesar normal yang dilalui oleh intrusi batuan andesit berarah timurlaut/baratdaya yang mengontrol daerah penelitian. Pengamatan dilakukan terhadap percontoh batubara hasil pengeboran eksplorasi pada lubang penambangan Air Laya. Analisis yang dilakukan meliputi parameter kualitas berupa tingkat kematangan (reflektansi vitrinit) dan nilai kalor yang merupakan indikator ada tidaknya pengaruh struktur geologi (intrusi andesit) terhadap lapisan batubara tersebut. Hasil penelitian menunjukkan bahwa kualitas lapisan batubara tersebut terpengaruh oleh struktur geologi/intrusi andesit yang diinterpretasikan dari data anomali nilai reflektansi vitrinit dan nilai kalor pada masing-masing percontoh. Hasil analisis pada percontoh BAL 03 diperoleh nilai Rvmax= 0,63% dan nilai kalor = 8.345 kkal/kg dengan kategori batubara sub-bituminus; pada percontoh BAL 07 didapatkan nilai Rvmax= 0,78% dan nilai kalor = 8.315 kkal/kg dengan kategori batubara bituminus yang mengandung zat terbang tinggi, sedangkan pada percontoh lubang bor BAL 02 didapat nilai Rvmax= 0,45% dan nilai kalor = 6.836 kkal/kg, percontoh BAL 04 didapatkan nilai Rvmax= 0,43% dan nilai kalor = 6.775 kkal/kg, percontoh BAL 05 didapatkan nilai Rvmax= 0,46% dan nilai kalor = 7.115 kkal/kg, percontoh BAL 06 didapatkan nilai Rvmax= 0,47% dan nilai kalor = 6.950 kkal/kg. Semuanya masuk dalam kategori batubara sub-bituminus. Dapat disimpulkan bahwa percontoh di lokasi BAL 03 dan BAL 07 terpengaruh oleh struktur geologi (intrusi andesit), sedangkan percontoh di lokasi BAL 02, BAL 04, BAL 05, dan BAL 06 tidak terpengaruh. Interpretasi tersebut didukung dengan terdapatnya tiga rentang nilai reflektansi vitrinit (Rvmax) pada Lapisan Batubara E, yaitu 0,4 - 0,5%, 0,58 - 0,66 dan 0,74 - 0,82%