During pilot hole drilling

1. The pilot hole drilling commences slowly and carefully with low load and rotation.

2. Upon the completion of the first stabilizer, the initial drilling direction may be controlled by Bergteamet and the Client (optional) and new adjustments are made (if necessary).

3. The pilot hole drilling continues, by adding one stabilizer to each other, carefully until the whole stabilizer package has been drilled down into the rock.

4. The pilot hole drilling continues with normal load and rotation by adding one drill rod after each other. Rock samples, coming up with the flush water, is regular taken for visual inspection. If fractures or significant changes of the rock conditions are recognized, the thrust and rotation of the pilot bit is adjusted in accordance with our experience. If the flush water disappears, grouting may be necessary.

5. After the pilot hole has reach its final depth the deviation from the theoretical point for break through will be measured.