. Report of the geological exploration of the fortieth parallel . ions are of special importance in the working of low-grade ores, which canonly be done profitably ou a large scale and at small expense per ton, and inwhich the loss of a small percentage of the value is comparatively trifling inamount. McCones Pan.—The McCone pan, constructed by Mr. McCoue, pro-prietor of the Nevada foundery, at Silver City, is one of this kind. Someof the details of its construction, and the method of setting it up, are shownin the drawings1 on Plate XXII. Figs. 1 and 2 show the pan; as it is mountedon a timbe
. Report of the geological exploration of the fortieth parallel . ions are of special importance in the working of low-grade ores, which canonly be done profitably ou a large scale and at small expense per ton, and inwhich the loss of a small percentage of the value is comparatively trifling inamount. McCones Pan.—The McCone pan, constructed by Mr. McCoue, pro-prietor of the Nevada foundery, at Silver City, is one of this kind. Someof the details of its construction, and the method of setting it up, are shownin the drawings1 on Plate XXII. Figs. 1 and 2 show the pan; as it is mountedon a timber frame-work, and the gearing by which it is set in operation. InFig. 2 a portion of the pan-rim is removed to show the interior. Fig. 3 showsa vertical section and Fig. 4, a plan of the pan. In the latter a portion ofthe muller-platc is shown and another portion is removed, exposing the shoesand dies below. This pan is 5 feet in diameter and 28 inches deep. It is 1 From drawings recently made and furnished to the writer by Mr. Tyrrell, of theNevada Piatt- XXII
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