11. Cyanide has been used to extract gold from crushed rock for more than 100 years. 12. With 80 quarries, Tarmac is the United Kingdom's largest producer of crushed rock , sand, and gravel. 13. The Castella Quarries produces sandstone and crushed rock . 14. Sodium cyanide is considered the most efficient and economic way to extract gold from crushed rock . 15. We are talking about stone and crushed rock , which is used in road and building construction. 16. The railroad used crushed rock Three Mile Bay; and in the village of Cleveland on North Street. 17. The product mix includes fluxed and converter dolomite, dolomite flour, crushed rock for construction and road works. 18. Dikes without a foreland have a layer of crushed rock below the waterline to slow wave action. 19. The embankment required of crushed rock . 20. The seamount and its nearby peers were created by the movement of crushed rock , resulting from seeping region.
