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Patio-process.

The patio-process of amalgamation is practiced in Peru and Mexico. A patio, or amalgamation, floor, is a large paved area, walled around to contain the fortas, or flat, circular heaps of ground ore, salt, magistral, etc., which are tramped by horses, treated by mercury, etc., as described under amalgamator, page 75 (which see). The process was invented by Medina in 1557, and was introduced into Nevada with but indifferent success.

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