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The geochemical samples were prepared f o r analysis by the following treatments :The rock and glacial-debris samples were crushed t o -0.25 inches (-6.35 mm) using a chipmunk crusher. The crushed rock was s p l i t w i t h a Jones s p l i t t e r and ground t o a -1 50 mesh using a v e r t i c l e pulverizer with ceramic plates .The stream-sediment samples were air-dried and sieved through an / 80-mesh sieve. The -80 mesh f r a c t i o n was saved f o r analysis.An oxide-residue oxalic-acid-leachable fraction was obtained by the procedure described by Alminas and Mosier (1976). Fifty mls of 1.5 -N oxal i c acid was boiled in a beaker containing 5 g of -80 mesh stream-sediment or pulverized glacial debris. After 5 minutes the liquid was f i l t e r e d while hot through a quantitative, f a s t f i l t e r paper. The f i l t r a t e was taken t o dryness on a hot plate and placed in a muffle furnace a t 450" C f o r four hours. The residue was then pulverized with a mortar and pestle to a fraction smaller than 80 mesh. This fraction was saved f o r analysis.

This report is preliminary and has not been edited or reviewed for conformity with Geological Survey standards Analytical and statistical data for 1019 stream sediment samples from the Chandalar quadrangle are given on Table 1. The sample localities are shown on Figure 1. 848 of the samples were collected in the 1975 field season; 171 samples were collected from 1958-1967 (Brosge and Reiser, 1970. Samples were collected from the active stream channel wherever possible; where this was not possible, samples were collected from bank or terrace deposits adjacent to the channel. The stream-sediment samples were air dried and prepared by shaking through an 80-mesh stainless steel sieve. The minus-80-mesh fraction was saved for analyses. Most samples were analyzed by a six-step, DC-arc, semiquantitative emission spectrographic method described by Grimes and Marranzino (1968) for the analysis of geologic material.Selected samples were analyzed for gold, silver, and zinc by atomic absorption methods described by Ward and others (1969). Antimony was determined by the atomic absorption method developed by We!sen and Chao (1975). Arsenic was analyzed by a colorimetric method described by Ward and others (1963). The analyses were done by M.