THE MINING AND QUARRY INDUSTRY I9IO 37 



Sherman & Co. This is a large concrete and steel structure sit- 

 uated between "A" and " B " shafts on the Harmony mines, just 

 south of the Old Bed group. While the mechanical methods of ore 

 treatment follow in a general way those adopted in the earlier mills, 

 there are many features that make for increased efficiency and 

 economy. The full running capacity of 200 tons an hour will prob- 

 ably be attained, considerably larger than the capacity of any other 

 mill in this country for magnetic concentration of iron ores. The 

 mill is designed to provide for the increasing output of the Harmony 

 mines which are second in importance only to the Old Bed group. 



According to present plans mining will soon be resumed in the 

 Barton hill section. These deposits will be worked through a tun- 

 nel which has been driven into the south end of the hill so as to 

 intersect the ore at some distance below the outcrop. Some ore 

 was shipped from the mines last year in connection with experi- 

 mental work in concentration. The ore differs from both the Har- 

 mony and Old Bed magnetite and the resumption of mining may 

 necessitate the construction of another mill specially designed for 

 its treatment. 



With the progress of mining and exploration at Mineville new 

 features of the ore occurrences are being uncovered each year. A 

 deep test hole drilled during 1909 and 1910 from the tunnel of Bar- 

 ton hill encountered crystalline limestone and much dark horn- 

 blendic gneiss in association with the lighter ore-bearing gneiss. 

 This is probably the first discovery of limestone in close proximity 

 to the magnetite bodies and is of considerable interest, though its 

 presence in the syenitic gneisses elsewhere is not altogether rare. 



Cheever mine. The property of the Cheever Iron Ore Co., just . 

 north of Port Henry, has now reached a stage of development that 

 assures a steady output of ore for some time to come. The mine 

 had been dismantled and abandoned for twenty years or more. 

 The work of draining and reopening has required time and has been 

 attended to with some difficulty owing to the lack of information as 

 to the situation and extent of the ore left in the old workings. Up 

 to the middle of last year operations were mainly directed toward 

 exploration and to the assembling of the necessary underground 

 and surface plants. 



Mining has been limited thus far to the southern part of the ore 

 zone, which was tapped by the Weldon and Tunnel shafts of the 

 former operative company. These shafts have been retimbered and 

 a third shaft opened in the ground farther north. Some high grade 



