The IPO could be Thornton's last chance to change the fortunes of Barrick, a mining company he's led since 2014. The IPO will likely be a key focus for shareholders when Barrick reports its quarterly earnings on Monday. (Bloomberg) -- John Thornton appeared ready last year to step down as chairman of Barrick Mining Corp. after a turbulent 12-year tenure. Through a new, publicly listed company, Barrick would retain majority control of the assets while floating a minority interest to the public. Dealmaker Turned Corporate LeaderLong before he joined Barrick, Thornton had established himself as one of Wall Street's premier dealmakers.