Penjelidikan tambahan terhadap bahan2 baku semen didaerah istimewa atjeh ini dilakukan atas permintaan direktorat perentjanaan & pengembangan,direktorat djendral perindustrian kimia
the result og geological prospecting work at sigihan deposit in 1963 gave the information on general asctructure pf the deposite,ita stratigraphie section and probable bounderies of coal distribution