RE: WM and DM Wallbridge owns 10 M shares of Duluth, and that there are about 124 M shares of Wallbridge, on a fully diluted basis. So with Duluth trading at 1 dollar, each share of Wallbridge, valued only on its Duluth holding, is worth 8 cents. Duluth would give Wallbridge a nice, but not huge, boost if its share price increased. To keep things simple, suppose DM trades at $1, and WM trades at $.24. All other things being equal, if DM doubled in price, WM would go up to .32, or 25%. So you would want to buy Wallbridge primarily for its own properties and potential, with the Duluth holdings as a secondary consideration. So I think one question you have to answer is, do you want to buy Duluth as a moderately-certain future mining operation, or do you like the more speculative appeal of Wallbridge?
There's no advice here (and why would you follow my advice, anyway?) but I hope the numbers presented help in making a decision.