Tungsten Ores

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Tungsten Ores
R H Robert Heron Rastall
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Hess, of the United States Geological Survey : " In the Great Basin region of the United States, a broad belt of limestones, extending from the north-western part of Utah westerly across the central and southern-central parts of Nevada, thence swinging southward along the Sierra Nevada and around its southern end, has been intruded by granites which have brought with them tungsten-bearing solutions from which scheelite has been deposited in the meta- morphosed limestones. The deposits are as va...riable in com- position and in size and distribution as are most contact- metamorphic deposits. In places they are largely iron-garnet with dark green epidote. In other places iron is much less in evidence, and the garnets are light coloured and the epidote is also very light coloured. Hornblende forms a large part of a few deposits, and in many others is nearly absent. The ore is ' patchy/ and although spots are rich, in general the WO 3 content ranges from i to 2 per cent. The tungsten mineral is invariably scheelite, generally white, although a little is glassy, some is dark grey, and much is yellowish.

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