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Updated: May 18, 2025
Calcination of the Ore. Having arranged a proper mixture of ores in the yard, it is weighed out in boxes to the calcining-men. This is drawn up an inclined plane over the tops of the furnaces, and from thence emptied through hoppers, 3-1/2 to 4-1/2 tons at a time, into the large calcining furnace.
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