During May 1973, a geological investigation was carried out in the central part of prangat anticline belonge to prengat ondrangle. The perpose was to looste and to collect data on rock expesure in the central.
As a result of the favourable outcome, obtained during a goverment survey of the coalfields in residency Palembang in the year 1915, at which time the discovery of high-calorie coal raised hopes that combustible had been found here, equal to the best European coal,
Tulisan ini merupakan suatu kompilasi dari beberapa laporan penyelidikan terdahulu yang telah dilakukan didaerah kalimantan Timur dan Selatan, yang terdapat di Perpustakaan Direktorat Geologi Bandung dan di P.N. Pertamina Jakarta.
In the framework of the ,,iron and project" of the Biro Perantjang Negara, geological investigations on the coal deposits in the Sungup-Selaro region, in the northern part of Pulau Laut (Southeast Kalimantan), were carried out in 1959 by the Geological Survey of Indonesia.
the survey started in june, 1917, and was suspended on the 15th of february, 1918, due to illness, on account of which the survey of the concession "Boenian" could not entirely be completed
pada tahun 1979,proyek inventiarisasi dan eksplorasi batubara telah mulai menyelidiki endapan batubara di alimantan timur,di daerah antara samarinda-balikpapan
in the framework of the iron and street project of the biro pranjang negara,geological investigation on the coal deposits in te sungup-salero region in the northen part of pulau laut(southhest Kalimantan),were carried our in the 1958 by the geoogical survey indonesia
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