Having done executive level consulting for two of the biggest mining operations in the world, it's my anecdotal observations that the execs at those companies have some of the lowest/worst ethics I have ever seen in my 20+ years of work.

To put it into context, I have worked with lawmakers / politicians, lobbyists, fortune 100 boards / exec teams and porn companies. By far the worst human beings I have ever encountered in my life (who weren't like, legitimately criminals, at trial) were the people in the mining industry.