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The bridge, across the north branch of the Waianakarua River, was widened in 2004 as part of a $3.63 million realignment of State Highway 1, just south of Herbert.
About 300 blocks of Oamaru stone, weighing between 500kg and 1.5 tonnes, were lifted off the bridge. The stone sides were replaced to retain the historic character of the bridge.
Local sculptor Matt King used some, making a stone wall for the historic Herbert cemetery. There was still quite a lot left so it was decided to hold a sale, Mr King said.
Some of the stone still bears the marks of the original masons.
Mr King will give a demonstration on how to go about marking out a piece of stone and different techniques to work with it.
Building walls in gardens was one option for its use, he said. The stone is in convenient sizes and a "fairly sizeable bit" costs $5.
A silent auction might be held for larger pieces.
The stone was "lovely" to work with, Mr King said.