THE MINING AND QUARRY INDUSTRY I908 37 



the mines are capable. An important addition to the equipment 

 that is to be provided according to the company's plans is a noduliz- 

 ing- plant for the treatment of the concentrates. The process of 

 nodulizing- iron ore was first applied to the residues obtained from 

 burning pyrites in the manufacture of acids. Experiments with 

 the process on some magnetic concentrates have shown that it 

 has a beneficial effect in lowering the sulfur content and agglom- 

 erating the fine particles into lumps that are better adapted for 

 the blast furnace. The apparatus employed for the purpose con- 

 sists of a long rotary kiln usually heated by gas, into which the 

 material is fed and where it is subjected to a temperature that 

 produces incipient fusion. The rotary motion of the kiln prevents 

 the formation of a solid cake and the product comes out in the 

 form of nodules or lumps from )4 to 3^2 inch in diameter. Though 

 magnetite is one of the most resistant minerals to heat, it is said 

 that the nodulizing of concentrates can be effected without diffi- 

 culty, probably owing to the small quantities of impurities present 

 and the influence of the highly heated gases which may reduce 

 it partially to metallic condition. 



Salisbury mine. This mine situated 2 miles north of Salisbury 

 Center, Herkimer co. is expected to begin shipments during the 

 current season. It has been under development for some time by 

 the Salisbury Steel & Iron Co. The mining and milling plants 

 have been nearly completed and the railroad extended 6 miles north 

 from Dolgeville to the mill site at Irondalc. The mill has a capac- 

 ity of 500 tons crude ore a day ; it is equipped with Ball-Norton 

 drum and belt type of magnetic separators which have been so 

 successfully used elsewhere on Adirondack magnetites. A cob- 

 bing machine is designed to effect a preliminary separation of the 

 lump ore as mined into furnace and mill products. The mill stands 

 at the base of the hill below the main shaft with which it is con- 

 nected by means of a Bleichert aerial tramway 6250 feet long. Gas 

 engines of 750 horse power using producer gas will supply power 

 for the mines and mill. The installation and developments com- 

 pleted and tmder way call for an expenditure of about $500,000. 



Clinton hematite mines. There was a cessation of development 

 work on the Clinton belt last year and only two mines made any 

 shipments. The producers were C. A. Borst at Clinton and the 

 Furnaceville Iron Ore Co. at Ontario Center. A resumption of 

 o.ctivity may be expected with the return of favorable trade 

 conditions. 



