Charles Dye, Momentum (1951)
“ He couldn't spare the time to turn his head and watch Walton, but he could follow the other's progress in welding the framework of the blinker tower by the irregular breathing and clanks and buzzes coming through his earphones. He listened to Walton's motions with an automatic alertness developed over six long weeks of tension—ever since the finding of the rotenite nuggets on the second of the light-marker asteroids. The rotenite represented enough wealth to make them among the richest men in the solar system. Or one of them—the richest. That was what Ballard was afraid of. ”
