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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Imelda R.Silalahi, Imelda
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Education Energy Engineering Environmental Science

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PROSES SEDIMENTASI DASAR LAUT DI TELUK KUMAI, KALIMANTAN TENGAH, DAN HUBUNGANNYA DENGAN CEBAKAN EMAS DAN PERAK Usman, Ediar; R.Silalahi, Imelda
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 4 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

Results of analysis of gold and silver contents within the sea floor sediments in the Kumai Bay show that the highest contents are at the location of TPL-43, TPL-44, TPL-54, TPL-74 and TPL-75 locations with ranging from 0,09 to 0,19 ppm for gold and 1,6 to 3,75 ppm for silver. A curve showing the relationship between grain size and percentage of grain cumulative of gold and silver bearing sediments indicates that the deposition process is a combination pattern between saltation and suspension. The saltation pattern happened at the grain size between -1,5 to 2 phi and suspension pattern 2 - 4 phi. Based on relation curve of the grain size and frequency percentage of the grains indicate the present of a certain grain dominated the depositional process. The most influenced grain size on depositional process are between 0,5 - 2,5 phi that are a medium sand to very fine sand of about 10 - 28%. The depositional pattern of the sediment in the survey area is influenced by the regime of bay current as a combination of the sea and river currents to form the coastal sand sediments. Result of the analysis can become a guidence in gold and silver mining activities in the study area in order to obtain optimal results, that is on sediments with size ranging from medium - very fine sand around the coastline area. Keywords: sediment, gold and silver, depositional process, grain size, Kumai Bay
Co-Authors Ediar Usman