426 "^^^^^^ MINING INDUSTEY. 



remains to be developed. The extraction of ore was, at the time referred to, 

 confined to the deposits on the surface, where 25 men were at work quarry- 

 ing out the rock, assorting and sacking the ore, getting out about 25 tons per 

 day for miUing. The yield of this is stated at between $100 and $200 per 

 ton. There appeared to be a large quantity of rock on hand, described as low- 

 grade, estimated to yield $50 or $60 per ton. 



There are two mills at Sherman, belonging to this company, in which 

 their ores are worked. Some descriptive notes of these mills and methods 

 employed in working the ores will be found further on. The following is a 

 partial statement of the yield of this mine up to September, 1869. It was 

 furnished to the writer by Mr. E. H. M. Bailey, accountant for the company. 

 It is said not to include all that has been produced from the company's claim, 

 as the early records were imperfect. The total yield up to the same date is 

 estimated at $1,500,000, coin. 



According to Mr. Bailey there have been worked 



22 tons of selected ore, producing, net $96, 459 46 



2300 tons, producing $300 per ton 690, 000 00 



600 tons, producing $200 per ton 120, 000 00 



744 tons, producing $148 per ton 110, 112 00 



1200 tons, producing $102 per ton 122, 400 00 



1,138,971 46 



AuEOKA. — The Aurora mine, situated on the crest of the hill, at the south 

 end and just above the town of Treasure City, is located on another deposit, which 

 is of a different type from that of the Eberhardt. It is wanting still more than, 

 the last-named in the characteristic features of a fissure vein, but is rather a 

 course or series of ore-bearing deposits, lying in a north and south or, more 

 nearly, in a north-northwest and south-southeast, direction, along which line 

 there seems to have been a movement or disturbance of the rocks sufficient to 

 crush and crumble them into fragments, but in which movement there are no 

 apparent evidences of a regular, deep-seated fracture, or fissure. 



The character of the ore-bearing material is similar to that of the Eber- 

 hardt, consisting of brecciated limestone, much of it in small fragments and 



