REP40601

• Permit No: C1981018
• IBM Index Class Name: Report
• Doc Date: 1/22/1993
• Doc Name: 1991-1992 AHR REVIEW ESERADO MINE C-81-018
• From: DMG
• To: JANET BINNS
• Annual Report Year: 1991
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St.. Rppm 215
Denver, CO 80203
Phone: [phone]
FAX:[phone]
January 22, 1993
TO: Janet Hinns ,l ~
FM: Shawn Smith - ~i' ""
Re: AHR Review `1990-1992 for Deserado Mine (C-81-018)
Dear Janet:
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Roy Romer
Governor
Michael B Long
Dnis~on Di.eaor
I have utilized the following documents in my Annual Hydrology
Review for two years; 1991 and 1992:
Mine permit, Vol I, Section II.C.- hydrology data with PHC
The First Annual Hydrology Report 1981-1985 with baseline data
The Second Annual Hydrology Report; 10/85-9/86
The Third Annual Hydrology Report; 10/86-9/87
The Seventh Annual Hydrology Report; 10/90-9/91
The Eighth Annual Hydrology Report; 10/91-9/92
NPDES reports for 1991-1992, 1st, 2nd and 3rd quarter reports
Findings Report; January 1992
i. Concerns: 2 main categories
A. The current PHC contains no predictions or determinations
of TDS levels. Determinations must be made based on the
past observations and present trends. These
determinations need to be incorporated into the PHC and
AHR.
B. The mine is experiencing elevated TDS levels in mine
inflow and discharging elevated TDS waters into the White
River. This issue needs to be outlined and explained in
the PHC with a followup in the AHR until the problem is
corrected or the cause determined to be other than a
mining issue.
II. Recommended Actions
A. THAT THE MINE GIVE FIRST PRIORITY TO LOCATING THE SOURCE
AND REASON FOR EXTREME SALINITY LEVELS IN THE MINE
INFLOW.
1. Recommend that the operator conduct a mine inflow
study. This could be accomplished by an EC pocket
survey. Locations of samples need to be mapped.