YELLOWKNIFE, Northwest Territories & MISSOULA, Mont.–(BUSINESS WIRE)–Dominion Diamond Corporation (TSX: DDC, NYSE: DDC) (the “Company” or “Dominion”) and The Washington Companies (“Washington”), a group of privately held North American mining, industrial and transportation businesses founded by industrialist and entrepreneur Dennis R. Washington, today announced that they have entered into an arrangement agreement (the “Arrangement Agreement”) under which an entity affiliated with Washington