USGS Open-File Report 2011–1316: Geochemical Data from Waters in Prospect Gulch, San Juan County, Colorado, that Span Pre- and Post-Lark Mine Remediation

Geochemical Data from Waters in Prospect Gulch, San Juan County, Colorado, that Span Pre- and Post-Lark Mine Remediation

By Raymond H. Johnson, Douglas B. Yager, and Hugh D. Johnson

Abstract

In San Juan County, Colorado, the effects of historical mining continue to contribute dissolved metals to groundwater and surface water. Water samples in Prospect Gulch near Silverton, Colorado, were collected at selected locations that span pre- and post-reclamation activities at the Lark Mine, located in the Prospect Gulch watershed. Geochemical results from those water samples are presented in this report. Water samples were analyzed for specific conductance, pH, temperature, and dissolved oxygen with handheld field meters, and metals were analyzed using inductively coupled plasma–mass spectrometry.

First posted December 29, 2011

Report PDF (1.8 MB)

Table 1 XLS (86 kB)
Sample data arranged by location and date
Table 2 XLS (59 kB)
Sample data arranged in downstream series
Table 3 XLS (39 kB)
Cement Creek stream dischargedata for all sample dates

For additional information contact:

Crustal Geophysics
and Geochemistry Science Center
Box 25046, Mail Stop 964
Denver, CO 80225
crustal.usgs.gov

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Suggested citation:

Johnson, R.H., Yager, D.B., and Johnson, H.D., 2011, Geochemical data from waters in Prospect Gulch, San Juan County, Colorado, that span pre- and post-Lark Mine remediation: U.S. Geological Survey Open-File Report 2011–1316, 4 p.

Contents

Abstract

Introduction

Hydrologic Setting

Methods

Data

References Cited