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Mineralogy from Cores in Prospect Gulch, San Juan County, Colorado

May 5, 2007

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 acid-mine 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, data was collected from drill core, which included: (1) detailed descriptions of the subsurface geology and hydrothermal alteration patterns, (2) depth of sulfide oxidation, and (3) quantitative mineralogy.

Citation Information

Publication Year 2007
Title Mineralogy from Cores in Prospect Gulch, San Juan County, Colorado
DOI 10.3133/ofr20071095
Authors Dana J. Bove, Raymond H. Johnson, Douglas B. Yager
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2007-1095
Index ID ofr20071095
Record Source USGS Publications Warehouse
USGS Organization U.S. Geological Survey