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"Rehabilitation of Park City's Daly-Judge Tunnel for the 2002 Olympics" by Dr. Mike Nelson

Abstract: Control and removal of water was an ongoing challenge for mines in the Park City District. This presentation will discuss the development and maintenance of drainage tunnels in the district, and the continuing importance of some of those tunnels as sources of potable water for Park City offered an interesting opportunity to review the methods for developing and supporting the tunnels, and to recommend measures for ensuring the availability of the water from those tunnels during and after the 2002 Winter Olympics. The development of the Ontario No. 2 drainage tunnel in the late 1800s was key to the continuing profitability of the Ontario mine, and required innovation and persistence in dealing with soft ground, high-pressure water, and very hard rock. The condition of the Daly Judge tunnel was of particular concern in preparation for the 2002 Winter Olympics. The water from the tunnel is naturally potable, unless there is a fall of rock that stirs up the fines on the floor of the mine. Those fines carry the heavy metals one would expect given the geology of the area. An assessment of the timber supports in the Daly Judge tunnel found that some of the timber supports were near failure. A plan for rehabilitating those supports was designed and executed. Biography: Dr. Michael G. (Mike) Nelson is a senior mining consultant at Stantec Inc. He was previously professor of mining engineering at the University of Alaska Fairbanks (1989–1994) and the University of Utah (1999–2023), where he was Department Chair for 11 years. He holds degrees in metallurgical engineering (B.S.), applied physics (M.S.), and mining engineering (Ph.D.). He is a Registered Member, Fellow, and Distinguished Member of the Society for Mining, Metallurgy & Exploration (SME). Mike contributed significantly to handbooks recently published updated by SME, as author or co-author of four chapters in the Mining Engineering Handbook(2011), five in the SME Mineral Processing and Extractive Metallurgy Handbook (2019), and two in the Underground Mining Handbook (2023). He has co-authored or contributed to 11 additional books, and has also prepared 37 refereed publications relating to underground mining, mineral processing, mine health and safety, and mining education. Mike has worked for Kennecott Copper, Westinghouse Electric, Consolidation Coal, and EIMCO Process Equipment. He holds nine patents in mining and mineral processing technology, and has given invited short courses in the U.S.A., Australia, Ecuador, and India. He has served as a consultant and expert witness for 27 clients and as a director or advisor to several junior mining companies. He is in the second year of a 6-year appointment as a member of the Board of Advisors for the Utah State Trust Lands Administration.