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Cornwall has a major advantage when it comes to alternative energy production: It sits atop a 280-million-year-old granite mass known as the Cornubian batholith, which is geologically ideal for producing geothermal energy.

The team’s research indicates the Spirit Lake batholith served as a plug in the Earth’s crust, diverting the magma.

Pink granite batholith circles Ensign Lake, and prehistoric “volcano bombs” — chunks of rock blown off the side of a volcano — lie at the bottom of Kekekabic Lake.

Monazite, together with a small amount of gold, is also known in the stream gravels of the Boise Basin, Idaho, where a large granitic batholith evidently carries the mineral sparsely distributed throughout.

To capture that heat, water is pumped down from the surface through fissures in the batholith.