Board Thread:Questions and Answers/@comment-32767457-20190609052830/@comment-31763506-20190610040345

There's mining materials processing investment, which is probably what Scoutman means, and the separate disputed mine shaft investment you get with discretionary funds after the Battle of Yhilin. Basically, the former is investing in a method for more efficiently using the entire mine's output instead of just the magical materials the nobles chiefly want, and the other is a the ownership of a particular disputed shaft, but not the whole mine. They give separate revenues at the end of ch 3 through ch 4.

I understand the dispute started over an argument over the date of the Treaty Utrecht.