370 MmmG industey. 



portant of them will suffice to indicate the extent to which they have been 

 developed. 



Teoy, — The Troy ledge crops out on Lander Hill, just below the Florida, 

 and is worked by an incline, which is located close by the Lane and Fuller 

 shaft, just referred to. The company claim 800 feet on the ledge. Its course 

 is north 40° west, true, and its dip 20° to 30° northeasterly. The incline, 

 dipping with the vein, is 284 feet deep, from which drifts, from 200 to 400 

 feet in length, have been run in the vein on three several levels, at 168, 222, 

 and 284 feet from the surface. The chief source of ore was found in the 

 upper portion of the ground. The ore occurred in pockets and bunches, of 

 a high grade in value, but not in large bodies. It resembles generally that 

 already described. The incline is provided with very well arranged hoisting 

 machinery, an engine, with a 12-inch cylinder, driving friction-gear. The 

 cost of these hoisting works, including boiler, engine, winding apparatus, &c., 

 was about $7,000. The average value of the ore produced is about $190 to 

 $200 per ton. On the 28th April, 1868, the books of the mine showed an 

 expenditure of little over $70,000, while the production amounted to little 

 over $35,000 in coin. 



According to the quarterly returns of the assessor for the county the 

 total production of this mine, from June 30, 1865, to June 30, 1869, amounted 

 to 278 tons of ore, averaging little over $190 per ton, or, in the aggregate, 

 about $53,000 in coin. 



Floeida. — The Florida ledge is worked by the New York and Austin 

 Silver Mining Company. Their claim, originally 800 feet in length, is reduced 

 to 550 by compromise with the Magnolia, a company adjoining them on the 

 west, working on what was formerly located as a separate vein, but afterward 

 proved to be the same as the Florida, or one of its branches. The course of 

 the ledge is north 60° west, dipping northeasterly at about 30°. The incline 

 by which it is worked is 500 feet long, from which drifts are run on five 

 levels, generally 100 feet apart. These levels, excepting the lowest, are from 

 100 to 200 feet in length, and have developed a large body of rich ore, which 

 was from 100 to 130 feet in length, measured along the drift, the vein being 

 from four or five to sixteen inches wide in places. From the 400-foot level 

 up to the surface everything known to be worth mining, within the limits 



