Convergence causes production slowdown at Broadmeadow

THE BHP Billiton Mitsubishi Alliance is attempting to manage the impact of a convergence incident at its Broadmeadow longwall top coal caving mine in Queensland.
Convergence causes production slowdown at Broadmeadow Convergence causes production slowdown at Broadmeadow Convergence causes production slowdown at Broadmeadow Convergence causes production slowdown at Broadmeadow Convergence causes production slowdown at Broadmeadow

BMA's Broadmeadow mine.

Lou Caruana

The effect on production on the mine will not be known until the company reports figures in its December quarterly operational review, a spokeswoman told International Coal News

“This was not an incident involving a cave-in,” she said.

“The structural integrity of the longwall remains intact. The definition we are using is ‘convergence’ – which is the result of strata above the roof of the longwall shifting and causing the roof to exert pressure on some of the longwall shields and impact a part of the longwall face.

“There was no emergency evacuation, operational procedures worked effectively, the area at risk was secured safely.”

Longwall moves at Broadmeadow have already dragged down the record production at BHP Billiton's Queensland Coal subsidiary achieved in the September quarter at its Daunia and South Walker Creek mines.

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