Sediment Distribution related to Gold and Silver Placer Deposits in Offshore of Sambas Besar Estuary, Sambas Regency, West Kalimantan

Ediar Usman, I. W. Lugra

Abstract


DOI: 10.17014/ijog.v6i1.113

Result of grain size analysis of the sea floor sediments from the study area indicates four sediment types, those are silt, sandy silt, silty sand, and sand. The silt unit has the widest distribution that is around 127.2 km2, sandy silt 12.65 km2, sand 1.176 km2, and silty sand 0.44 km2. Result of gold and silver content analysis from some selected samples indicates that the highest gold and silver amount are at PMK-08 location in northern part of the study area with gold content of 0.21 ppm and silver 13.36 ppm; both are silt sediment types. The highest gold and silver content occur within medium - coarse sediments containing subrounded grains of quartz and pyrite, at northern part of the study area. The presence of silver and gold is suggested to be controlled by a north-south longshore current pattern. The source of sediments from Sambas Besar River follows the longshore current, e.g. in northern estuary from south to north, and at southern estuary from north to south direction.


Keywords


gold; silver; silt - sand; longshore current' river' quartz; Sambas Besar River

References


Casagrande, A., 1948. Classification and Identification of Soils. Transaction ASCE Journal, 901h.

Cronan, D.S., 1980. Underwater Mineral, Academic press: 362h. Folk, R.L., 1980. Petrology of Sedimentary Rock. Hemphill, Publishing Company, Austin, Texas.

Katili, J.A., 1980. Geotectonics of Indonesia, A Modern View.Directorate General of Mines, Jakarta, 271h.

Rusmana, E. dan Pieters, P.E., 1993. Peta Geologi Lembar Sambas/Siluas, Kalimantan, Skala 1 : 250.000. Pusat Penelitian dan Pengembangan Geologi, Bandung.

Usman, E., Aryanto, N.C.D., Setyanto., A., dan Ibrahim, A., 2006. Pemetaan Tematik Sumber Daya Kelautan di Pesisir dan Laut Kalimantan Barat. PT. Nincec Multi Dimensi, Bandung, 290 h.

Van Leeuwen, T.M., 1994. Twenty Five Years of Mineral Exploration and Discovery in Indonesia. Elsevier, Amsterdam. DOI:10.1016/0375-6742(94)90021-3

Visher, G.S., 1965. Fluvial Processes as Interpreted from Ancient and Recent Fluvial Deposits. In: Friedman, G.M. and Johnson, K.G., 1982, (eds.), Exercises in Sedimentology. John Wiley & Sons Inc, New York, 208 h.

Visher, G.S., 1969. Grain Size Distributions and Depositional Processes. In: Friedman, G.M. and Johnson, K.G., 1982, (eds.), Exercises in Sedimentology. John Wiley & Sons Inc, New York, 208 h.

Wahib, A., Lugra, I.W., Astawa, I.N., dan Yuningsih, A., 2001. Penyelidikan Agregat di Perairan Muara Sungai Sambas, Provinsi Kalimantan Barat. Pusat Penelitian dan Pengembangan Geologi Kelautan, Bandung, Laporan Intern, 98 h.

Woodroffe, C.D., 1996. Late Quaternary infill of Macrotidal Estuaries in Northern Australia. In: Nordstrom, K.F. and Roman, C.T. (eds.), Estuarine Shores: Evaluation, Environments and Alterations. John Wiley & Sons Ltd, New York, h.89-114.

Wyrtki, K., 1961. Physical Oceanography of Southeast Asian Waters. Naga Report 2, SIO La Jolla, CA, 195h. DOI:10.1017/S0025315400054370


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