2018 No. 1 - Decker Coal Company
2017 No. 2 - KK&L
2017 No. 1 - Waters Edge
2016 No. 1 - Schmidt Construction, Inc.
2013 No. 2 - Gypsum Resource Materials | Alton Coal Development, LLC | GBS Construction
2013 No. 1 - Thompson Logging
2012 No. 2 - Legarza Exploration
2012 No. 1 - Rocky Mountain Recycling
2011 No. 2 - Great Salt Lake Minerals
2011 No. 1 - Flatiron Construction
2010 No. 2 - Hycroft Mine
2010 No. 1 - Tear A Part
2009 No. 2 - Wyodak Resources
2009 No. 1 - Hettinger LLC
2008 No. 3 - EnergySolutions | Bridgerland Applied Technology College
2008 No. 2 - Most Wanted Drilling LLC
2008 No. 1 - Commuter Rail Constructors
2007 No. 2 - Rees's Enterprise
2007 No. 1 - Sierra Ready Mix, Inc.