1847.] Mining Report JVo. 1. 195 



ceal veins in a few instances, yet there are causes which have 

 operated quite extensively, which would generally secure their 

 outcrop upon the more elevated parts of a country, and at the 

 same time operate unfavorably for their appearance in valleys. 



2. Arrangement of the 7nasses of ore constituting the Winter 

 ore bed. — The bed is situated, as has been intimated, upon a hill 

 not less than 800 feet above the valley of the Ausable at Clinton- 

 ville. It is a rounded prominence where the ore occurs, and 

 when it was first worked twenty years ago, it was upon its 

 summit. On the south, east, and west, it slopes into this val- 

 ley; on the north, it descends into a small valley about 400 feet 

 wide, when another steep ascent leads to another prominence. 



The ore was first observed in a mass varying in thickness from 

 four to six feet, lying upon the top of the rock, and dipping only 

 slightly to the northwest. It occupied a space not far from 40 

 feet in width, and 60 or 70 in length. The surface was rich and 

 uniformly so; but on penetrating the mass .o the depth of four 

 feet in some places, and six in others, it became lean, and was 

 worthless below that depth. This mass, to use a common expres- 

 sion, was skinned off; and as a leanness appeared at this stage, 

 in all directions, the workings were continued no farther. Sub- 

 sequently however, the proprietor worked in an adit, or tunnel, 

 from the small valley on the north, nearly two hundred feet, and 

 directly beneath the old surface workings. But this was lost 

 labor, no ore was met with in the adit, and this plan of working 

 was abandoned. 



The ore upon the hill, however, was not wholly confined 

 to the mass which had been mined, and as it is time to speak of 

 the arrangement of these masses, I will first give a sketch of the 

 plan of the veins, as they appeared, or as they have been deve- 

 loped in the progress of the works. I shall then speak of the ore as 

 it has been developed in the north valley, which although regarded 

 as parts of the same upon the hill, yet they have been disconnect- 

 ed or separated by subterranean agencies. It is proper to observe 

 that to the north, on the margin of the valley, this mass of ore 

 terminated abruptly and formed a mural wall from four to six 

 feet high, precisely as if it had been broken from a continuous 

 mass. 



Fig. 1 is a sectional view of the workings upon the top of the 

 hill, "where the ore was first raised; A upon the right and above 

 3, the flat mass already referred to, which was first removed. 



