sentences:  Some of the world's major mining companies, including Newmont Mining, Barrick Gold and Kinross Gold, operate gold mines in the state.Active major mines include Cortez, Twin Creeks, Betz-Post, Meikle, Marigold, Round Mountain, Jerritt Canyon and Getchell.Newmont and Barrick operate the largest mining operations, on the prolific Carlin Trend, one of the world's richest mining districts.