Greenland might not be for sale, but it is open for business. And that could mean a boom for its mining industry.
In business-friendly Texas, lawmakers could crack down on sand mines amid flooding concerns.
Author Porter Fox says trade across America's northern border predates the border itself.
The industry says disclosure puts it at a competitive disadvantage.
The state's Department of Natural Resources says flying an unmanned aircraft is a cheaper and faster alternative to other methods, including helicopters.