Doc. No. 9.] 85 



hundred tons of ore per day, which from its appearance would not be a large 

 estimate, it is probably the most powerful machinery in this country and will 

 compare with any in Europe. ' 



The operations of this mine are looked for with considerable interest at 

 home and abroad, as their capacities for reduction are much more exten 

 sive than any hitherto put up in this country. 



OSBORN HILL MINE. 



i 



This mine is located two miles east of Grass Valley, it has been opened 

 on the course of the vein four-hundred and fifty feet and from sixty-five to 

 seventy feet in depth. Vein strikes north and south dipping east at an 

 angle of forty degrees ; the transverse section shows a depth of sixty-five 

 feet ; the shaft was carried through twelve feet of alluvium, seven of clay 

 slate, seventeen of a much broken and decomposed greenstone, and fifteen 

 feet of compact rock of the same character ; total depth including winze I 

 is nearly seventy feet. The vein at this mine has dislocated all the rocks 

 above it and possesses that half stratified appearance as in the Lafayette, 

 arising from fracture by the intrusive vein. The power of the vein is about 

 three feet at the depth of sixty-five feet. In the longitudinal section, the 

 levels which have been driven are given to scale and their different lengths 

 are found by reference to the sketch. This mine has been one of the most 

 flourishing and profitable of the State and has been conducted with much 

 prudence and economy. 



WYOMING MINE. 



This mine is situated on the north bank of Deer Creek, about two miles 

 below the town of Nevada ; its altitude above the Creek is two hundred 

 and forty feet, and the higher parts of the outcrop on the line of the vein 

 will reach nearly or quite three hundred feet above the same point. An 

 adit was driven about two hundred feet through clay slate, which intersected 

 the vein at this point, at an angle of about twenty-seven degrees. From 

 this, two levels have been driven on the vein, of one hundred and twenty 

 and fifty feet each, and a winze of twenty-five. The vein dips east with an 

 angle of forty five degrees, having a strike north and south, with a power 

 of three feet. Fifty feet below the upper adit, another was commenced 

 and carried to a hundred and twenty-five feet, intending to intersect the 

 vein at one hundred feet below the surface of the shaft F ; at seventy-six feet 

 the greenstone was met, and the adit carried fifty feet into it. At the junction 

 of the slates and trap, the former are much changed, evidently from the 

 effects of heat, while at the junction of the slates and vein, above this, they 

 have again suffered from the intrusion of the latter. 



On the south side of the hill the vein crops cut through the trap two 

 hundred feet below the summit,with an increased power, leaving no room for 

 doubt of the permanency of its character. In this mine one of the recent 

 veins has cut through from the Bunker Hill Mine, east of this, which 

 produced a valuable nest of ore ; the dip of the principal Wyoming 



