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2001 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Table 1 Location and geochemistry of mine wastes, bedrock, and stream sediment samples at the King and Dawson mercury mines, and Avenal Creek mercury prospect 12 ILLUSTRATIONS Figure 1 Location of the Parkfield mercury district in the California Coast Range mercury mineral belt. Map modified from Rytuba (1996). 2 Locations of calcine, altered rock, and stream sediment samples at the King and Dawson mines, and Avenal Creek area, Parkfield mercury district, California 3 Overview of King mine area. Remains of retort and calcines in foreground, locations of samples 21K15C and 21K16B. Main calcine pile in upper part of photo, location of samples 21K17-20C. 11 4 Calcine pile at King mine, location of samples 21K17-20C. Mine car track above calcines indicates the amount of calcines removed by erosion. White material that coats calcine are efflorescent salts (area above 5 hammer). 5 Fine-grained stream sediment accumulated in dry creek below largest calcine pile at King mine (Fig.7), sample location 21K21S. Sediment consists primarily of clay and colloidal size particles released from the 6 calcine pile. 6 Three pipe retort at Dawson mine, location of sample 21DC1 6 7 Silica-carbonate (SC) type mercury deposits associated with serpentinite have high nickel and cobalt concentration, field I, as compared to hot spring (HS) type mercury deposits, field II. Other trace elements enriched in SC deposits define Factor 2 (Co, Ni, Mg, Fe, Cr, Mn) and discriminate these deposits from HS deposits which are enriched in Factor 1 elements (Al, K, Na, V, Ti). Samples from the Dawson and King and Avenal Creek areas plot in the field of silica carbonate type deposits but some samples from the King mine plot in the hot spring type g field. 8 Gold distribution in calcine and altered rock samples at the King and Dawson mines, and Avenal Creek area 10 in Introduction

Geochemistry of selected mercury mine-tailings in the Parkfield Mercury District, California