100. DENNIS WASHINGTON

$6.3 BILLION  SELF-MADE SCORE: ) SOURCE: CONSTRUCTION, MINING AGE: 85 RESIDENCE: MISSOULA, MT PHILANTHROPY SCORE:

In October 2018, Washington’s newly acquired mining outfit Dominion Diamond unearthed a 552-carat yellow diamond 135 miles south of the Arctic Circle, the largest ever found in North America. That same month his 332-foot yacht Attessa IV collided with a commercial fishing boat, causing one death and several injuries. The industrialist, whose holdings include a railroad and a copper mine, bagged groceries and shined shoes as an adolescent and by age 15 was working construction jobs. From age 17 to 19, he operated machinery in Ketchikan, Alaska, where the above photograph was taken.

He started his Washington Cos. in 1964 with a $30,000 loan and a leased tractor.