62 



ECONOMIC GEOLOGY. 



The following table gives the results of Dr. Jackson's analyses of iron ores from vari- 

 ous parts of the state, some of them said to be of considerable importance : 



Thorn mountain, Jackson 



Unity — magnetic 



Winchester — magnetic. . . 



Lehanon — hematite 



Benton — hematite 



Eaton — bog ore 



Barnstead — bog ore 



Barnstead — nodular 



Charlestown — bog ore . . . 



Haverhill — bog ore 



Lebanon— bog ore 



Milford — bog ore 



Lancaster — bog ore 



37- 



62.6 



24.26 



65.17 



62.4 



49.92 



49.71 



36. 5 



48.12 



50.51 



48.65 



55-67 



46.56 



Lead. 



Lead is very widely disseminated. In nearly every town of the state 

 you will find a tradition to this effect : "A few years since, my uncle, 88 

 years old, died. He knew of a valuable vein of lead upon the mountain. 

 Was told of it by an Indian, who used to take an axe, chop off a lump of 

 the ore, melt it, and run it into bullets. Uncle never told me exactly 

 where it was, but there must be a magnificent vein of lead on the moun- 

 tain." Without doubt this is a correct statement, as lead is very com- 

 mon ; and those who have patience to explore the mountain over may be 

 rewarded for their pains. With the little space left, I can only briefly 

 mention the most important of our known lead openings. I will com- 

 mence with a description of the Madison mine, written by me in 1870. 

 Jackson has described this more fully in his report. 



Madison Lead Mine. The rock is a quartzite, near an immense sandy 

 plain, where rock exposures are almost unknown. An egg-shaped exca- 

 vation has been made into this rock not less than forty feet wide, and 

 perhaps sixty feet long by seventy-five deep. The wall rocks have a 



