What does Twain decide about mining as an occupation?

According to Twain, mining is a great occupation, as long as you hire someone else to do the work.

Because we judged that we had learned the real secret of success in silver mining—which was, not to mine the silver ourselves by the sweat of our brows and the labor of our hands, but to sell the ledges to the dull slaves of toil and let them do the mining!