pada tahun 1979,proyek inventiarisasi dan eksplorasi batubara telah mulai menyelidiki endapan batubara di alimantan timur,di daerah antara samarinda-balikpapan
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…
The result of the geologi cal and minig investigations on the coal deposits of South-Eastern-Kalimantan have been discussed in the report of the mining engineer Klees (issue 4 vol 3).
By decree of the Director of the State Enterprises dated October 10th, 1918 Nr. 3993/Dir the author was instructed to accomplish an investigation in the above mentioned arean the accurence of the coal deposits, which can be considered for exploitation in a simple way (in other words with methods used by the natives)