At a reduced flow, oil in the pipeline can freeze or form into a waxy buildup, raising the risk of interruptions and spills.

WSJ: Drilling Rules Hit Alaska Pipeline

He's even discussed reversing the flow of an 800, 000-barrel-per-day pipeline across Panama in order to make it easier to ship Venezuelan crude to Asia.

FORBES: Hugo's Folly

In May, Enbridge, a Canadian company, reversed the flow of a big North American oil pipeline, sending a glut of oil from America's northern plains southward to coastal refineries.

ECONOMIST: Petrol prices

Minera Andes had a cash flow from a 49% passive ownership in the San Jose Mine in Argentina, while US Gold had a development pipeline of projects.

FORBES: Rob McEwen Looks For Gold To Keep Rising As Nations Run Up Debt Levels