Case in point, my framework for mining companies is here: https://emergingtrajectories.com/a/pub/mining_company_risk_f... You can see the scores here: https://emergingtrajectories.com/c/copper_mining_companies
"Long term" -- we'll see, I expect to hold positions for 12-24 months.
For those interested, my work above is influenced by two important books: "You Can Be a Stock Market Genius Even if You're Not Too Smart" by Joel Greenblatt and "Superforecasting: The Art and Science of Prediction" by Philip Tetlock. The idea from Joel's writing is to look for less liquid or less popular asset classes (or ones that structurally can't be invested in by the pros who are smarter/better-resourced than you), and Tetlock really drills process and research for long-term forecasting.