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CORE OPERATION: A 'new generation' of core drills has been announced by Swedish manufacturer Atlas Copco by its Craelius company.

Optimised for the latest diamond and core technology, the Diamec U6 has up to 50% fewer parts, particularly on the rotation unit and feedframe, which means greater robustness and less maintenance, says the firm. It comes either skid or crawler mounted with electric or diesel power and is supplied either as a manual unit or with Automatic Performance Control, claimed to be highly tolerant of harsh conditions.

Craelius has also extended its CORAC wireline system to include A, B, N sizes as well as special sizes B2 and N2 which give a very thin kerf and therefore more recovered core. N. N2 and H can convert to triple tube core barrels for soft and sensitive rock.

There is also a new line of Super-cutter impregnated diamond core bits for hard rock formations. Three matrixes cover hard to very hard rock and penetration rates are said to be 20% better than rival systems. Worn diamonds release automatically exposing new diamonds for optimum cutting.

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