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From: Webster's Revised Unabridged Dictionary (1913)

 pa·chu·ca tank Metallurgy A high and narrow tank, with a central cylinder for the introduction of compressed air, used in the agitation and settling of pulp (pulverized ore and water) during treatment by the cyanide process; -- so named because, though originally devised in New Zealand, it was first practically introduced in Pachuca, Mexico.
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