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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Deskripsi Fisik
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In connection with the Agreement concluded with wedexro in March 1956 on the "Investigation into the Geological and Mining Aspects of the Iron-ore and Coal Occurrence in Indonesia" a Supplementary Agreement Was made on July 9, 1958 between the state Planning Bureau in Djakarta-referred to as BPM for short- and Wedexro relating to the investigation o…