"Age and experience help your imagination paint a picture of what's in between, " says Scott McLean, the CEO of Toronto-listed Transition Metals Corp.

WSJ: In Geology, Old-Timers Can Be Worth Their Weight in Gold

"It's unimaginable to think we'll need to rely on asteroids from space to supply the Earth with metals, " said Scott McLean, chief executive of HTX Minerals Corp.

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

And, while forward Scott McLean agreed a new one-year deal, Lambie has freed goalkeeper Garry Gow, defender Paddy Kelly, defenders Denis Connaghan, Fraser Easton and Greig Milligan, plus midfielder Duncan Lambie.

BBC: Marc McCulloch helps Thistle clinch promotion