The Longyear Diamond Bit Color Series is a versatile line of diamond coring bits, which utilises patent-pending technology for faster drilling and longer life.

According to Boart Longyear, the series makes small diamonds work hard in a low torque matrix, making the bits more effective in obtaining higher productivity.

After significant research, using novel metallurgy, the company said it has created a chemical bond between diamond and matrix, which is stronger than the diamond itself. The increased diamond projection and improved face flushing create a bit with more versatility, higher penetration rates and longer life, similar to large diamond bits, but with the easy, smooth drilling characteristics.

To support higher penetration rates, the new Longyear formulas are combined with a more open, express geometry. Tapered intermediate waterways improve flushing and prevent accumulation of debris. Designed for fast cutting in competent ground, the new express geometry is available in 16mm crown heights to maintain bit life at higher cutting speeds.

The Razorcut protrusions on the face of the bit contain diamonds that enable the bit to begin cutting right out of the box - even in the softest ground. The arrangement of these protrusions also improves the tracking and balance in the hole when drilling begins.

The new Longyear Green Bit is now available on the Australian market as a result of successful testing by Boart Longyear Drilling Services in both underground and surface coring. The Australian Boart Longyear drilling crews reportedly improved shift performance and ultimately metres drilled, time down the hole and core in the box with the new Longyear Green Bit.

Chris Lambert, senior product manager, said: "The two biggest questions for any bit are, how fast does it cut and how long does it last?

"The new Longyear Green Bit simply cuts faster (right out of the box) and lasts longer. The new line of colour coding is meant to make it easier to select and use bits for every type of ground condition and for every driller experience level."

The Longyear Green Bit is just the start. A selection of Longyear Bits has been engineered for the new Color Series to be used in a wide range of drilling conditions and ground formations. Once successful testing is complete, these additional bits will be made available first in Australia and then later rolled out to other parts of the world.