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Hauraki Plains Gazette, Volume XXXIV, Issue 4593, 1 August 1923, Page 3

The most extraordinary road in the world is one of glass running between Roaring Mountain and Golden Gate, in the Yellowstone Park, United gr States. When a route had been mapped out, engineers discovered that they would have to find a way of cutting down part of a mountain of volcanic glass to make a path for the road. Obsidian Cliff, 250 ft. high and . 4000 ft. wide stretched across the way glistening black glass with streaks of red and yellow. The engineers tried many kinds of blasting and heavy charges of dynamite, but with no good result. Amongst the workers was a man who had formerly had worked as a glassblower, and he suggested heating the obstruction to a high temperature and then spraying it with . water. Big bonfires of dry logs were lighted along the line of the highway for about three-quarters of a mile, and were were, kept burning for 50 hours. Ice cold water was used to 4 spray the side of the cliff. Suddenly ? the mountain exploded and when the smoke had cleared away it was seen that a part of it which had blocked the road-making operations had gone. The mass of glass debris was used for the building of the thoroughfare, it being almost as hard as Pint.