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<br />concentrations in Ralston Creek at the point of compliance and at the Long Lake Head Gate sampling
<br />station, which will benefit downstream users.
<br />The cost of treating the mine pool would be several million dollars per year.
<br />Cotter's water treatment consultants have estimated that start-up and first year's operating expenses for a
<br />water treatment system capable of treating the mine pool water would be significantly more expensive than
<br />treating groundwater that reports to Sump 1. In addition, although it is not clear that installing a
<br />submersible pump in the mine pool is feasible, the estimated cost of drilling, setting a pump, installing
<br />buried piping, and operating the submersible pump for the first year would be significant.
<br />Treatment costs would increase if uranium concentrations increase due to oxidation of wall rock in the
<br />underground mine.
<br />References
<br />Arnesen RT, Iversen ER (1997) The Lokken project - Flooding a sulphide ore mine. Proc 4th ICARD,
<br />Vancouver, BC, Canada, p 1095-1108
<br />Bureau of Land Management (BLM), 2010. BLM Colorado, Royal Gorge Field Office, Dinero Tunnel.
<br />http://www.blm.gov/co/st/en/fo/rgfo/minerals/abandoned_mines/aml_rgfo_main-Page/environmen
<br />tal restoration/dinero tunnel .html
<br />Cidu, R., Biddau, R., and Spano, T., 2005. Temporal Variations in Water Chemistry at Abandoned
<br />Underground Mines Hosted in a Carbonate Environment, Mine Water and the Environment 24:
<br />77-87, Springer-Verlag pub.
<br />DRMS, 2010. "Designated Mining Operation Environmental Protection Plan, TR-11, Adequacy Review
<br />#2", Letter from David Bird, DRMS, to Randy Whicker (Cotter Corporation) regarding
<br />"Schwartzwalder Mine, Jefferson County, Permit No M-1977-300. May 19, 2010. 7 pp.
<br />Dowling, Jeremy, Atkin, Steve, Beale, Geoff, and Alexander, Glenn, 2004. Development of the Sleeper Pit
<br />Lake, Mine Water and the Environment 23: 2-11, Springer-Verlag, pub.
<br />Fernandez-Rubio, R. , Fernandez-Lorca, S., and Arleoul, E. "Preventive techniques for controlling acid
<br />water in underground mines by flooding", International Mine Water Association (IMWA), 1025-
<br />9112 (Print) 1616-1068 (Online), Volume 6, Number 3 / September, 1987, published online
<br />October 2006
<br />Norquist, Bruce, 2001. "Shrinkage stope practices in the Schwartzwalder Mine", Chapter 20, Underground
<br />Mining Methods: Engineering Fundamentals and International Case Studies, edited by W. A.
<br />Hustrulid, Richard C. Bullock. Published by Society for Mining Metallurgy & Exploration (SME),
<br />March 2 00 1.
<br />.Mining & Environmental Services (MES), 2008. Steve Level Adit Bulkheads, As-Built Documentation
<br />Package, prepared for Cotter Corporation, March 16, 2008.
<br />Soule, John Henderson, 1960. Mining methods and costs, Schwartzwalder uranium mine, Jefferson
<br />County, Colo. U.S. Department of the Interior, Bureau of Mines.
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