I'd think that they'd have a small number of geokinetics, psammokinetics, crystallokinetics and metallokinetics mixed in, some of whom would be miners, prospectors and jewel vendors (while the other miners and prospectors would be normal/powerless)
Might even want some supers who can sense information about the earth/soil/metals/gems/crystals, or some who could crystal-read to see the future/past/etc.
Just a suggestion.
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)