The Kings Mercury Mine and Mill site was discovered in 1872 and worked intermittantly until about 1961. Total production is estimated at 3000 flasks of mercury. Mine development on the southeast side of the property is reported to comprise 7000 feet of adits and tunnels on several levels. According to land status maps and a recent survey conducted by the BLM in 1997, BLM holdings are limited to a stream reach northwest of the mill site and a few hundred feet along Pozo Creek (see photo and map above). Both of these areas contain mine waste and tailings which are the focus of the BLM environmental investigation. The mill site is primarily private ground and parts of the underground workings may be on Forest Service land.

Water and sediment sampling was initiated during FY2002. Sample analysis indicates elevated levels of elemental and methy mercury exist in the calcine or mercury retort tailings that are located adjacent to the historic .  

CERCLA Actions

CERLCA cleanup actions are proposed during the FY2006-13 period, depending upon the statewide CERCLA remediation schedule and available funding.