Which tool would provide continuous rock cores for vertical exploration?

• A. Diamond core drill
• B. Shelby tube
• C. Hand lens
• D. Grab sampler

Answer: (A)

To get continuous rock cores as you drill downward, you need a system that cuts rock and preserves a long, intact cylindrical sample inside a core barrel. A diamond core drill does exactly that: it uses diamond-tipped bits to cut through rock while a hollow core barrel collects the continuous cylindrical sample as the drill advances. This allows detailed geological logging of lithology, bedding, fractures, and other features with depth, which is essential for vertical exploration.

The Shelby tube is for relatively undisturbed soil sampling and doesn’t produce continuous rock cores through hard formations. A hand lens is simply a magnifier for examining grains and features, not a sampling tool. A grab sampler collects surface material in a single grab and does not provide a continuous subsurface core. Hence, for continuous rock cores during vertical exploration, the diamond core drill is the appropriate tool.