AMIE MINE. 



473 



however, by no means covered all the possible ground in which it might 

 occur, so that the statement, that the southern ore body previously observed 

 does not extend as far east as this, rests on rather negative evidence. In 

 only one point in the southern workings had a raise been made which found 

 the Wash resting directly on the ore horizon. Elsewhere the covering 

 of White Porphyry still remained. The actual width of the outcrop of the 

 ore horizon in this ground is deduced from observations in the adjoining 

 mines. 



The workings of the Amie mine have been intelligently and systemat- 

 ically conducted from the very commencement, so that it has had advan- 

 tages in the cost of extraction of ore over other mines, and has been able to 

 mine even the low-grade iron at a profit. Two compartment shafts, No. 1 

 and No. 2, each provided with cages, were sunk entirely through the first, 

 and at that time the only known, ore horizon, near the east and west limits of 

 the claim, respectively. These were connected by a main level, provided 

 with a tramway, from which cross-drifts underrun the main ore body, so that 

 in mining the ore requires but one handling, falling directly from the stopes, 

 through ore shoots, into the mine cars in which it is taken to the surface. 

 Shafts No. 3 and No. 4 were sunk later, to explore the ground to the north 

 and south of the main ore body, respectively. 



The thickness of different rock formations passed through by these 

 shafts will serve to show their irregularities and part of the data on which 

 the sections have been constructed. They are as follows: 



The main level, which has an elevation of 10,365 feet, is 150 feet and 

 160 feet below the collars of No. 1 and No. 2 shafts, respectively, the col- 

 lars of these shafts being placed about ten feet above the ground to allow 

 space for the dump. No. 2 shaft, it will be observed, has been sunk to a 

 considerable depth in the Silurian formation, in which it has developed the 



