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The underground road leading down to where the gypsum is extracted is steep and with sharp bends.

A runaway freighter full of gypsum rammed a steel bridge, but the cause was crew inattention, not mechanical like Baltimore.

White Sands National Park, about an hour’s drive from Las Cruces and four hours from the capital, lets you wander 250-plus square miles of white gypsum sand dunes on foot or by bike — year-round.

Mr Adams-King, cabinet member for universal services, said the charges currently helped pay for the recycling or disposal of DIY waste, such as soil, rubble, asbestos and gypsum board, which require specialist processing.

The project entails converting sulphur dioxide into sulphuric acid, which is then neutralised with limestone to generate gypsum waste.