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material.It is in good demand at prices up to $x2 per unit of tungsten-trioxide, making 70 per cent.ore worth $840 per ton.The following paragraphs describe some of these gold and tungsten deposits in the southwestern part of the county, in the vicinity of Eldora and Nederland, from data obtained during a short visit to the county in •9o6.The mineral deposits of Gilpin County have been briefly described by G. H. Garrey in Bulletin No. 285, pp.35-40.The gold and silver deposits of Clear Creek County have been described by Messrs. Spurr and Garrey in Bulletin No. 260, U.S. Geological Survey, pp.99-t2o, and a more complete report is now in press.On the other hand, very little has been published in the way of a geological description of the Boulder County mines.
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