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: 
: u a 
= o i 9 
a|/aleaile|/s)/a/a]s 
Thorn mountain, Jackson 54-8] 43.6leeenenlecsecsleceserleceees 1.6 | 37-99 
Unity—magnetic 90.4] 4 Gr Bl accsorstarsilio'siaiape | reieiacozs)| eee aie 62.6 
Winchester—magnetic, ......cccessecececeeeveccccesenas 34 6666) 22 nates oieorcds mas spaces | ca tna 24.26 
Lebanoo—ieiatiit nexiwsesasve eens ears 94 (Gilsson see | enaraearso NRetanatats all acaba oth ciutar 65.17 
Benton—hemiatite ve ssisse cx sues aviewicree ve ts casera go Ce Cees ees Gees een 2 62.4 
Eaton—bog ore..... cece cece cence cee e nea csnoenes Wsitesiteneta 72 EQ: || arasaceiece TOS | eia:eesdsedl esesesdecce 4 49-92 
Barnstead—bog ore.. 71.6] 9.4|e--e.. GiB haversrarsces| eveiare ++] 9.2 | 49-97 
Barnstead—nodular.,..... inoue bao scossnyegeie at utaiacekesiavareresavsioteve 52.8] 2.8}...6.. 10.8] 2.4]seueee 30 36.5 
Charlestown—bog Ore ...esec ese ceen cece en ee cece cennnees 69.4] 4.6}.-.... 18.6|Trace - 48) 6.92] 48.12 
Haverhill bogiOre :sseiclwis.cianjeeitnirinterece wie vicwiercare afelas 72.6) 4.6)...... TA 8 | esciaseees eresatnners Io 50.52 
Lebanon —bogione sisters tice’ vaisvcsrasere va ais apcreelgieans oe ayaietstelainn 70:6) FG) se TSk Pees apvont| sarees 5.8 | 48.65 
Milford—bog ore.... 80 Bo fesaees BuBhiccertedi laguna 3-2 | 55.67 
Laineaster—bop ores ia eaciiigaeeuacseansnen tiie sence 7i.2|  2.6}...... 5am ocr] Leecioeee 14.2 | 46.56 
Leap. 
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 
