"Gold! Gold!" a hundred voices were shouting. Dean hardly heard the voice of the foreman, made suddenly garrulous with excitement. He stared at the big drill head, heaped high with the precious metal. It was jammed into the diamond-studded face of the drill; it filled every crack and crevice, a smooth, solid mass on top of the head and against the stem. A workman had brought a singlejack and chisel; he was prying at a ribbon of the yellow stuff. Riley went for him, gun in hand. "L'ave it be!" he shouted. "But, confound it all, Dean," Smithy's voice was saying in a tone of disgust, "I thought we were working on a power plant. Not that a gold mine is so bad; but we can't work it--we can't go down after it at ten miles." "Gold mine!" Rawson echoed. "I'll say it's a gold mine--but not because of the gold. Do you notice anything peculiar about that, Smithy?" His assistant replied with a quick exclamation: "You're right, Dean! I knew there was something haywire with that. Solid chunk--been cast around that stem--melted on. And that means--" "Heat," said Rawson. "It means we've found what we're after. Give the gold to the men; tell them we'll divide it evenly among them. There's more down there, but there's something better: there's energy, power!" He snapped out quick orders. "Get the temperature. Drop a recording pyrometer. Let me know at once. There'll be plenty doing now!" * * * * * Drill rods and cables, all were made of the newest aluminum alloy. The long tube that held the pyrometer was formed of the same metal. Smithy sent it down to get a recording of the temperatures of that subterranean cave into which their tools had plunged. He adjusted the recording mechanism himself and stood beside the twenty-inch casing that held back the loose sand from the big bore. Then he watched ten sections of cable, each a mile in length, each heavier than the last, as they went hissing into the earth. From the cable control shed the voice of Riley was calling the depth. "Fifty-two thousand." Then by hundreds until he cried: "Fifty-two-seven. We're into the big cave! Now another hundred feet." The cable was moving slowly. In the middle of Riley's call of "Fifty-two-eight," a jangling bell told that the bottom of the pyrometer carrier had touched. "Up with it," Smithy ordered. "Make it snappy. We'll see if we've got another cargo of gold." There was an undeniable thrill in this reaching to a tremendous distance underground, this groping about in a deep-hidden cave, where molten gold was to be found. What had they tapped?--he asked himself. He saw visions of some vast pool of hot, liquid gold. Perhaps Dean would have to change his plans. They could rig up some kind of a bailer; they could bring out thousands of dollars at a time.