Excerpt from Zinc Mining in Tennessee
The central belt occupies the valley of the Holston River, and is called the Holston Valley zinc belt. This belt has ores containing zinc with no lead and less than per cent iron. The more northerly ore bodies, near the Powell River, and ... the southerly belt, near the French Broad River, carry both iron and lead.
The ore bodies along the northerly belt, which include the district in the vicinity of the Powell River, the Clinch River, and between these two rivers, near the city of New Tazewell, in Claiborne County, and in Union County, are extremely large. The ores are a compact blende, or what is called zinc sulphide, being mined frequently in huge blocks several feet thick, assaying 45 to 50 per cent zinc. This ore, however, is extremely difficult to mill, but makes a good smelting ore.
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