610 



MINIKG INDUSTRY. 



Tlie following lots of ore were among those making up this product, 

 and will serve to indicate the average value of ores of this class : 



Where from- 



Snowdrift lode . . 



Snowdrift lode . . 



Equator lode . . . 



Terrible lode . . . 



Terrible lode . . . 



Baker lode . . . 



W. B. Astorlode . 

 Gilpin and McClellan 



Cliff lode . . . . 

 Silver Eagle lode 



Creek lode . . . 



No. of tons. 



4 

 60 

 90 

 so 



2 

 12 

 II 

 40 



25 



3% 



Assay value, 

 in coin, per 

 ton. 



$191 36 



80 to 190 00 



150 00 



190 to 240 00 



454 00 



J07 90 



148 86 



60 to 113 00 



150 00 



289 45 



gi2 20 



Mr. Huepeden's establishment is in the center of Georgetown. It is 

 located on the bank of the creek, from which it derives an excellent water- 

 power. It possesses ample crushing capacity, consisting of 10 stamps, of 

 600 pounds each, a Dodge crusher, and Ball pulveriser. The last two appli- 

 ances are chiefly used, the stamps being held in reserve for extraordinary 

 work. The crushed ore is roasted with' salt and then amalgamated, the pro- 

 cess employed being essentially the same as that just referred to, except 

 that the first operation is performed in Briickner's revolving cylinders and 

 the last in barrels. 



Mr. Bruckner's cyHnder is a contrivance designed to roast ores with salt 

 at a much less cost for manual labor than is involved in the operation of the 

 reverberatory furnace. It is a horizontal cylinder, constructed of iron, usually 

 boiler-plate, and lined with fire-brick. Its form and some of the details of 

 its construction are shown on Plate XXXVI. It is commonly about 11 or 

 12 feet long and 5 or 6 feet in diameter. It is supported on rollers, i, so 

 that it may turn freely when set in motion by the revolving gear, h. One 

 end of the cylinder communicates with a brick fireplace, A, while the oppo- 

 site end, C, is let into the stack so that the flame from the fireplace passes 

 through the interior of the cylinder. Within the cylinder there is a dia- 

 phragm, or partition, running longitudinally through the greater part of its 

 length. This partition is made of iron and covered with fire-proof material. 



