in response to the request goverment of the republic of indonesi,the goverment of japan decided to conduct the feasibilty study (the study) on banko coal effective utilization in south Sumatera ( yhe project) as one of the international coopration programs for the social and economic develovement of develoving countries.
in an investigation of the potential of alluvium of the sungai balayo the company has drilled thirty two hand auger,sixtiy nine mechanical holes and sunk eleven pits.the mechanical drill holes were restirected to a depth of 6.10 meters
on account of the "agreement for a resistivity survey" no.9/PC/PD/a?405 between direktorat geolgi and P.T TROPIC ENDEAVOUR INDONESIA,a resistivitysurvey was carried out from mei 14,to june 7,1974 and from jum 21,to july 2,1974 A,D,C reistivity unit of 2 KWA has Been used during the survey
the directorat general of mines ,and the directorate general of geolgy and mineral resources of the departement of mines and energy of the republic of indonesia ,and new energy Develovement Organization ,japan,Concluded the agreement On Central sumatera Coal exploration Project ,CTA-156,On October 9 ,1986 at jakarta.
the objective of the investigation is yhe carry out VSP Survey On Drill Hole In Ombilin II area and Too Take The nacesarry Data For analysis Of te Geologichal Structure.
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