when you do a google search of biggest moly deposit in the US, search results come with American CuMo, which is also biggest unmined deposit in the world. This is dirt cheap, no matter who runs it!!!!
Located in the heart of Idaho, the CuMo project is an open pit accessible deposit currently in the preliminary economic assessment stage. As of January 1, 2020, the project has a 28-year mine life and is the largest un-mined molybdenum project in the world.