IRON 



927 



In some places the Northamptonshire ore appears to be the result of an alteration 

 of an argillaceous carbonate, similar to the Cleveland ore. 



The importance of the iron ores of Yorkshire (North Eiding or Cleveland District) 

 will be shown by the production of Cleveland ore in 1872. 



The following are the quantities of brown haematite which have been produced since 

 1868: 



