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In the late nineteenth century, San Juan County, Colorado, was the center of a metal mining boom in the San Juan Mountains. Although most mining activity ceased by the 1990s, the effects of historical mining continue to contribute metals to ground water and surface water. Previous research by the U.S. Geological Survey identified ground-water discharge as a significant pathway for the loading of metals to surface water from both acidmine drainage and acid-rock drainage. In an effort to understand the ground-water flow system in the upper Animas River watershed, Prospect Gulch was selected for further study because of the amount of previous data provided in and around that particular watershed. In support of this ground-water research effort, wells and piezometers were installed to allow for coring during installation, subsurface hydrologic testing, and the monitoring of ground-water hydraulic heads and geochemistry. This report summarizes the data that were collected during and after the installation of these wells and piezometers and includes (1) subsurface completion details, (2) locations and elevations, (3) geologic logs and elemental data, (4) slug test data for the estimation of subsurface hydraulic conductivities, and (5) hydraulic head data. Introduction In the late nineteenth century, San Juan County, Colorado, was the center of a metal mining boom in the San Juan Mountains. Although most mining activity ceased by the 1990s, the effects of historical mining continue to contribute metals to ground water and surface water. These increased metal concentrations degrade stream-water quality and are toxic to fish and other aquatic organisms. As a result, viable fish and aquatic habitat is now more limited than what existed before mining (Besser and others, in press). Since the 1990s, the local economic base has shifted away from hard-rock mining toward tourism with a focus on recreational opportunities. Increased population downstream also has increased the demand for clean water. While streams in this area have low pH and elevated metal loads due to acid-rock drainage, the influence of acid-mine drainage due to historical mining activities has degraded preexisting ground-water and surface-water quality (Church and others, in press). Determining the ground-water flow and associated dissolved-metal transport is critical to protecting ground-water and surface-water resources, determining the influence of acid-mine drainage compared to versus preexisting acid-rock drainage, and providing sensible remedial options. 1 U.S. Geological Survey, Minerals Resources Team, Denver, Colorado

Completion reports, core logs, and hydrogeologic data from wells and piezometers in Prospect Gulch, San Juan County, Colorado