The report also lauds the land-based eLoran radio navigation system as a very worthy back-up technology.

BBC: UK 'over-reliant' on GPS signals, engineers warn

Back on land, mining-company engineers say new techniques, such as dissolving minerals and sucking them up through a pipe or extracting ore with high-powered water jets, could increase recoverable reserves.

WSJ: Exhausting the Earth's Resources? Not So Fast

Commercial products which are apparently only about a year to 18 months away and as de Smet details in the video, could land on store shelves in a compacted rolled-up form for "unpacking" back home.

ENGADGET