The Mahakam River in Borneo Island, has long been used by the surrounding coal mining company to send their mining product by using barges. Conveyor belt used to deliver the mining products from stock pile to barges, and jetty serves as a haven for the barge.The geotechnical investigation is needed to ensure the jetty and conveyor belt placed on the appropriate type of foundation.The study begins with geotechnical mapping, followed by geotechnical drilling, SPT, and DCPT. The samples form geotechnical drilling tested in the laboratory, producing soil and rock mechanics data. The data from SPT, DCPT, are used as the foundation calculation analysis.The results showed that thr areas of research compiled by well graded sands (SW) and poorly graded sands (SP).The footing foundations choosed at point S01, S02, S03, and S04, with allowable bearing capacity 0.51 – 3.73 kg /cm2, at point S05 and S06, the pile foundation choosed, with allowable bearing capacity 19,733 – 36,436 tons. The preboring pile foundations choosed at point BH01, BH02, BH05, and BH 09 with allowable bearing capacity 15.7 – 75.7 tons, at point BH04, BH06, BH07, BH08 pile foundations are used, with allowable bearing capacity 9.7 – 105.6 tons.