PLANT OF SJJELTER C. 675 



stack F, communicating by a fine, 7>", with tlic dust chamber J)', carries off the 

 smoke. On the feeding-floor, and in close proximity with tlie feed-holes of the furnaces, 

 are disposed the fuel and old slag used as flux, as well as the mixtures of ore, dolo- 

 mite, and hematite entering into the composition of smelting charges. On the portion 

 Z V of the feeding floor are seen the crusher G and the ore-beds H, on the top of 

 \\hich are ])laced biicks of flue-dust and lime, specially molded in this form previous to 

 resmelting with the ore. To the right and left of the ore-beds are rows of ore bins, sup- 

 plied from the wagon-road, R. The scales. E, placed on the feeding-floor, are used for 

 weighing the different elements of the smelting charges, special ores and fluxes, which 

 are classified and distributed right and left on each side of these scales. Tbe portion of 

 the works placed between Y and Y' is inclosed in a light timber construction, V, pro- 

 tecting the workman, the plant, and the works agaiiist rain, wind, and cold.' 



1 represents a second row of ore-bins su])piied from the wagon-road S. These 

 bins are made of light timber ; they are opened in d for the removal of the ore, which 

 is wheeled to the crushers in the wooden ore barrows P. The bins are supplied from 

 the ore-wagons ilf through the apeiture rf', which can be closed by liinged wooden 

 doors. J^is the third row of ore-bins, exactly similar to the preceding. On road Tis 

 laid a railroad track, a siding of the Denver and Rio Grande Railway. N', represents 

 a car. In K is a fourth row of ore-bins, similar to those previously described, and at U 

 a wagon-road placed in direct communication with the upper level district road. At 

 the extreme wings of the row of bins E are to be seen huge fuel-bins for both coke 

 and charcoal. L represents a heap of charcoal placed on the upper level of the works; 

 on this level are also ore-dumps and heaps of dolomite and hematite. Inclined ways 

 run through the rows of ore-bins, connecting the diflerent levels, which allow the wheel- 

 ing down of ores, fluxes, and fuel. The charcoal-barrows, made of thin sheet iron, are 

 represented in 0; these barrows, in general use in the camp, hold about eight bushels 

 of charcoal. The feeding floor is connected with the furnace floor by means of a flight 

 of steps placed outside the main building, and also by zig-zag inclined ways for the 

 wheeling up of old slag to be resmelted. 



Standing on the slag-heap and facing tiie furnace, but not shown in the sketch, 

 are, on the left, the scales upon which the bars of bullion are weighed, and on the right, 

 the boiler, engine, and blast-ai)paratus rooms. Farther on the right stands the shed 

 in whicli flue-dust is mixed with lime, molded into bricks, and desiccated on driers 

 artificially heated. 



The offices, stafi' apartments, assay offices, and laboratory occupy a detached 

 building situated a short distance from the works and on a level with the lower road 

 of California gulch. A small office, provided with large Fairbanks scales, is placed 

 at the entrance of the works at one of the upper branch roads. The assay offices and 

 laboratory are well fitted up. The muffle furnace and crucible furnace are separate. 

 In the assay of ores and slag for lead, iron rods are always inserted in the crucible. 

 Experiments on the fusibility of mixtures of ores and fluxes are also made. The 

 .assays for silica are always evaporated in order to obtain the percentage both of 

 gangue and of soluble silica. 



' This building is not correctly represented in the drawing, the ridge-pole and ventilator being 

 a! 'he top of the furnace B, instead of at the stack F, as there shown. (S. F. E.) 



