Treatment of the Tungsten Ores of Boulder County, Colo (Classic Reprint)
This paper deals largely with the development of milling practice in Boulder County, the ore-dressing methods in use, and the local manufacture of ferrotungsten and tungstic oxide. The geology of the district and the mining methods are treated only brieﬂ:y. Local methods of analyzing ores, concentrates, ferrotungsten, and tungsten 'metal powder are discussed.
Figures giving the production of tungsten concentrates in the Boulder district, in the United States, and in the world, data on the rbuying of tungsten ores, costs of production, and the normal tungsten requirements in this country are presented. Imports and exports of tungsten ores of the United States are mentioned brieﬂ:y.
The writers hope that this report will prove of interest to all those interested in the treatment. Of tungsten ores and the manufacture of tungsten acid, tungsten powder, and ferrotungsten.
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