332 GEOLOGY OF EASTERN WISCONSIN. 



table should read, lime, for carbonate of lime, and magnesia, for car- 

 bonate of magnesia, so far as his anslysis is concerned. 



I am indebted to the kindness of Supt Sterling, for the following 

 relating to the iron interest at this point. The whole amount of 

 ore shipped from July 1, 1869, to January 1, 1872, was 173,842 tons; 

 the amount in 1872, 82,371 tons; in 1873, 48,706 tons; total for 

 the three and a half years, 304,919 tons. This ore was shipped to 

 Chicago, Joliet and Springfield, 111., St. Louis, Mo., "Wyandotte and 

 Jackson, Mich., Appleton, Green Bay and Milwaukee, in our own 

 state, and Zanesville and Newburg, Ohio, as well as to various other 

 points in small quantities. 



The cost of mining the ore (1873) is from 50 to 75 cents per ton. 



The value of the ore, delivered on the cars, is from $1.50 to $2.00 per ton. 



The average furnace-yield of metal, from the ore, is 45 per cent. 



The furnace at this point is 40 feet high, 9^ feet across the boshes, 



uses 4 or 5 tuyeres, as occasion may require, makes use of the hot blast, 



blown by steam power, burns charcoal the average cost of which is 



11|- cents per bushel and has a capacity of about 3,500 gross tons 



yearly. No flux is used. 



The composition of the pig-iron product is shown by the following 

 analysis, by E. T. Sweet, kindly furnished by Prof. Irving: 



Per cent. 



Iron 95.784 



Phosphorus 1 .675 



Graphite 1.379 



Combined carbon 0.849 



Silicon . 491 



Sulphur 0.108 



Manganese Trace. 



100.286 



In 1849, a blast furnace was established at the village of Mayville 

 for the reduction of this ore. I am indebted to Mr. James Secular 

 for the following facts concerning its present capacity and workings 

 (1873): Height, forty feet nine feet in the boshes; uses four 

 tuyeres, the hot air blast, charcoal as fuel, and steam and water com- 

 bined, as power. The charge is seven hundred pounds of ore and six- 

 teen bushels of charcoal. The ore used is from the north opening at 

 the Mayville Ore Bed. Limestone and lean ore have sometimes been 

 used as a flux. Sandstone was being tried. The yield is thirteen or 

 fourteen tons of iron per day, being about forty -two per cent, of the ore. 



Hartford. The deposit at this place is altogether similar to that 

 at Iron Ridge. It is, however, much inferior in both vertical and 

 lateral extent, and if the numerous statements collected concerning 



