Abstract
Stream sediment geochemistry is an effective method for identifying areas of mineral potential. In 2002, a stream sediment sampling program was conducted in East Java area of Republic of Indonesia. Minus 166 mesh (<77 micro meter) samples were collected at a density of approximately 0.6 sample/km2 and analysed for Au, Ag, Cu and other 46 elements. Comparing the sieving mesh size, it was shown that the minus 166 mesh fraction can reduce the nugget effect more than the minus 80 mesh fraction and therefore be used as more effective mineral exploration tool. In this survey, the relationship between gold grain distribution collecting after panning and Au geochemical anomalies can not be clarified so much. Due to the different geochemical anomalous value resulting from geology, it is necessary to take account of geological background, when you will evaluate the results of geochemical anomalies.
