Application for streamsedimentandore In Japan, there are a lot of placer gold regions. Of these, Kitakami mountain area in northern part of Japan represents mesothermal Au deposits which is characterized by production of native gold is generally ranges from 800 to 950. Samples ofstreamsedimentandore were taken from Kitakami region.
Flow chart of experiments Samples • Pulverized auriferous quartz vein • Sieved streamsediments (particles under 0.063mm in diameter • HOS is composed of I 2 , NaI and ethanol. • Solutions after dissolution of sample and addition of ascorbic acid were analyzed by ICP-MS. • Sample dissolved by 100cc of HOS were carried out for 2 cycles, that by 10cc for 1 cycle.