REP38023

• Permit No: C1981012
• IBM Index Class Name: Report
• Doc Date: 4/10/2001
• Doc Name: 1999 AND 2000 AHR Review
• From: DMG
• To: GREYSTONE DEVELOPMENT CONSULTANTS
• Annual Report Year: 1999
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

~ ~ III IIIIIIIIIIIIIIII
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman SI., Room 215
Denver, Colorado 80203
Phone [phone]
FAX: [phone]
April 10, 2001
~~
DIVISION O F i
MINERALSI-
GEOLOGYI
RECLAMATION
MINING•SAFETY
R~II Owens
Jetty Koblitz Governor
Principal

Greystone Development Consultants
5231 South Quebec Street Greg E. Watcher
Executive Director
Michael B. Long
Division Dnecmr
Greenwood Village, CO 80111
RE: 1999 and 2000 Annual Hydrology Reports, New Elk Mine, #C-81-012
Dear Mr. Koblitz:
The Division of Minerals and Geology has completed review of the 1999 and 2000 Annual Hydrology
Reports for the New Elk Mine,#C-81-012.
General Comments
The Division notes Table 1.2-3 of both reports that includes the elevations, total depth, zone of completion,
and monitoring purpose for all New Elk wells. This information complies with Rule 4.05.13(l)(d)(i).
Monitorine Frenuencv
Site visits and samples appear to have been taken in accordance with the approved plan. During 1999 and
2000, the mine was on a reduced monitoring frequency plan due to temporary cessation status.
!n general, the monitoring plan requires surface water monitoring of the Purga[oire River, alluvial water
monitoring of the Purgatoire alluvium, and monitoring of the water Flooding the mine workings. In
addition, the water level in the refuse pile is monitored for stability purposes. Pond discharges are
monitored as required by the approved Colorado Discharge Monitoring Permit issued by the Water Quality
Control Division.
Analysis of Data and Deter~rtination of Impacts
Surface Water Ouantity and Ouality
Two stations on the Purgatoire River are monitored for flow and field parameters on asemi-annual basis,
and water quality on an annual basis. PRS-1 is located upstream of all New Elk mining activities and
PRS-4 is located downstream of all mining activities, yet upstream of the conFluence of the North Fork of
the Purgatoire with the Middle Fork. Generally, flow relationships appear reasonable with some variation,
likely attributable to difficulties in accurate, in-stream flow measurements. Salinity, as measured by Total
Dissolved Solids (TDS) is effectively unchanged between the two sites, PRS-1 (205 mg/1 mean) vs. PRS-4
(210 mg/I mean). No identifiable impact to surface water quality or quantity is evident in the data
collected and reported.