1996-03-20_HYDROLOGY - M1977378

• Permit No: M1977378
• IBM Index Class Name: HYDROLOGY
• Doc Date: 3/20/1996
• Doc Name: Mitigation Projects
• From: DMG
• To: EPA
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St, Room 215
Denver,Colorado 80203
Phone:[phone]
FAX:[phone] iot
DEPARTMENT OF
NATURAL
DATE: February 13, 1996 RESOURCES
Roy Romer
TO: Bill Goodhard Governor
James S.FROM: Allen Sorenson 5 Executive Dirtect headr
' Michael B.Long
RE: Mitigation Work Plans for Sunnyside Settlement Division Director
It is the understanding of the Division of Minerals and Geology (DMG) that
the settlement agreement between Sunnyside Gold Corporation (SGC) and the
Water Quality Control Division (WQCD) will include provisions that DMG
will inspect pre-Mined Land Reclamation Act mining disturbance mitigation
projects to be completed by SGC under the settlement agreement, with the
purpose of these inspections being to make a determination as to whether
or not the mitigation completed meets the requirements of selected
performance standards of the Hard Rock/Metal Mining Rules and Regulations
of the Mined Land Reclamation Board. In order for DMG to make such a
determination, a basic up-front understanding of the mitigation project
work plans is necessary. DMG has reviewed the work plans that you
provided on February 12, 1996, and makes the following findings and
requests for additional information:
1. A final inspection of the Sunnyside Mine Pool Mitigation project is
not necessary for obvious reasons. A determination of the
effectiveness of this project could be made based on reports
detailing the amount and timing of alkaline solution added to the
mine pool correlated with the rate of rise of the mine pool, and,
possibly based on mine pool samples taken from the 1 inch pipes
through the American and Terry Tunnel bulkheads. Inspections of the
alkaline solution injection system could be completed by DMG during
preparation and operation of the system. Also, an inspection to
assess the dismantling, removal, and clean-up of the solution mixing
and pumping facilities in Sunnyside Basin may be appropriate.
2 . The Mine Waste Dump work plan, detailing mitigation of mine waste
and tailing near the American Tunnel portal location, provides the
basic information necessary to allow DMG to inspect the site and
make a determination as to whether or not the project has been
completed and meets the requirements of the selected performance
standards.
3 . The work plan detailing removal of Surface Mill Tailings at Eureka
provides the basic information necessary to allow DMG to inspect the
site and make a determination as to whether or not the project has
been completed and meets the requirements of the selected
performance standards. It is suggested that a determination as to