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)
The first investigations of the coal formation on the is land of pulau Laut Were carried out by mining-engineer C.DE GROOT, on account of a report published in 1850 by the architect of the engineers corps W. IHNE. Since he only visited the coal occurrences on the northern part of the island, D.E.GROOT was of the opinion that coal deposits occur only…
Exploration on coal deposit have been done within the bukit asam mining concession (P.N. tambang batu bara bukit asam) in Tanjung enim, south-sumatera. the areas of areas of klawas-antticline, A. Endikat and A. muara tiga- A. penjabungan - A. Suban Complex Have Been troughly investigated.