Sylvite was discovered in drill cores in 1925, and production began in 1931.

Geological samples, such as drill cores, can be rapidly mapped for nearly all minerals of commercial interest with hyperspectral imaging.

Maybe such an erratic mass lay out there, perhaps only a few hundred feet across and so missed by our drill cores, but rotten with uranium.

"If you take all the evidence together, it's compelling enough to warrant some experiments, to get some careful drill cores, etc.," he said.

Four overlapping drill cores at three sites reflect in excellent quality the geological history and glaciation of the Antarctic during the last 34 million years.

The drill core revealed breccia and similar materials at predicted depths.

The formation is no longer exposed at the surface; it is only known from drill cores.

Two sulphide concentrates from drill core contained 5 and 40 g/t Au.

The grains were found in a drill core that was taken from a depth of 200 feet.

Underground block size is measured from drill cores.