The Mother Lode region of California . ?•jSfsmn*^^- North Shaft and Mill, Utica Mine, Calaveras The Keystone Mine and Mill, Amador City. THE MOTHER LODE REGION—CALAVERAS COUNTY. 113 permits the insertion of a rough board 1x12 inches, which lies flushwith the upper edge of the lip of the mortar. Upon this the pulp fromthe screen falls, and it is considered a good amalgamator. After beingin use a short time, it amalgamates quickly, but does not stand the jaras well as the copper plate. A splashboard of this kind can be cleanedin one eighth of the time required to clean a copper plate. T
The Mother Lode region of California . ?•jSfsmn*^^- North Shaft and Mill, Utica Mine, Calaveras The Keystone Mine and Mill, Amador City. THE MOTHER LODE REGION—CALAVERAS COUNTY. 113 permits the insertion of a rough board 1x12 inches, which lies flushwith the upper edge of the lip of the mortar. Upon this the pulp fromthe screen falls, and it is considered a good amalgamator. After beingin use a short time, it amalgamates quickly, but does not stand the jaras well as the copper plate. A splashboard of this kind can be cleanedin one eighth of the time required to clean a copper plate. The boardis protected by a 2x6 inch board, extending across the apron, andhaving a |-inch hole bored at each end to receive two hooks fastened tothe battery posts. Four inches below the board, on the apron, runs atrough in which are two apertures 3 inches square, through which thepulp passes to a copper plate 5 inches wide, with a pitch toward themortar, whence it passes to the sluice plates, 2 feet wide and 22 feetlong, covered with yVi^ich copper plates set on a grade of 2 inches tothe foot. Each
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou
