diamond drill

They found, incredibly, the cylindrical core of a diamond drill.

The Northern Michigan Geological Repository Association in Marquette received the largest grant of $226,700 to buy a building for a diamond drill core library and geological data for research.

To do it, Clinton would need a sharpened hammer or diamond drill, time, and determination.

If these tools aren’t enough, you can also use an electric drill with a diamond drill bit.

More technological advances, including the diamond drill, electric rail and steam shovel, ushered in a new era of industrial-scale lead mining in southeast Missouri.