To drill a Basalt countertop, you will need a diamond-tipped drill bit, a drill, water, and safety equipment such as safety goggles and gloves. Here are the steps to follow:

1. Mark the spot where you want to drill the hole on the Basalt countertop using a marker or tape.

2. Fill a container with water and place it near the drilling spot.

3. Wear safety goggles and gloves to protect yourself from flying debris and dust.

4. Attach the diamond-tipped drill bit on to the drill.

5. Dip the drill bit in the water to lubricate it.

6. Hold the drill perpendicular to the Basalt countertop.

7. Place the tip of the drill bit on the marked spot and apply gentle pressure, letting the drill do the work.

8. Keep the drill bit and the hole lubricated with water throughout the drilling process.

9. Continue drilling until the hole is completed.

10. Wipe the surface clean and dry it after drilling.

11. Clean the drill bit with water and dry it thoroughly.

Note: Drilling into Basalt can be challenging and take longer than other materials due to its hardness. Its important to have patience and take breaks if necessary to avoid overheating the drill bit.