“Go ahead and finish up the details, such as installing the lining,” he said. “We didn’t get this far to be stopped now.”

But the prospecting parties, making full use of the time left them before winter closed down, returned late that fall to report no sign of the ore they needed.

Spring came and he was determined they would be smelting aluminum before the summer was over even though he had no idea where the ore would be found. They needed aluminum ore of a grade high enough that they could extract the pure aluminum oxide. Specifically, they needed aluminum oxide.⁠ ⁠…

Then he saw the answer to their problem, so obvious that all of them had overlooked it.