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

Open-File Report 2007-1095

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Abstract

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.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Mineralogy from Cores in Prospect Gulch, San Juan County, Colorado
Series title:
Open-File Report
Series number:
2007-1095
Edition:
Version 1.0
Year Published:
2007
Language:
ENGLISH
Publisher:
Geological Survey (U.S.)
Contributing office(s):
U.S. Geological Survey
Description:
iv, 82 p.
Online Only (Y/N):
Y