4 ECONOMIC GEOLOGY. 



can be mined advantageously): Gold, silver, copper, iron, lead, zinc, tin, 

 bismuth, manganese, arsenic, and molybdenum. 



Gold, 



Dr. Jackson discovered minute quantities of gold in the magnetic pyr- 

 ites of Canaan and Enfield. He made very extensive examinations of 

 several lots of the ore, and thoroughly satisfied himself that the metal 

 existed in too small amount to be of any practical value. 



I have had specimens sent me from a great many towns in the state, 

 believed to contain gold, and find most of them of no value. Those who 

 are inexperienced mistake yellow pyrites and mica for gold. In other 

 cases, as quartz is known to carry this metal in auriferous countries, peo- 

 ple are convinced that, if a vein of this substance is found in their neigh- 

 borhood, it must be rich in gold. In Volume II we have described enor- 

 mous beds or veins of this rock, some of them traceable for a hundred 

 miles. These have been opened at several places, but have nowhere been 

 found profitable, if, indeed, the presence of gold in small amount is not a 

 delusion. The wishes of the proprietors, coupled with duplicity on the 

 part of prospectors or speculators, may often lead to false reports of the 

 presence of gold. I have seen nothing to convince me that gold exists 

 in the following large beds, or veins: The Hooksett and Manchester 

 ranges of quartz, seen between Royalton, Mass., and Denmark, Me. ; the 

 beds in the Rockingham mica schist in Londonderry, Raymond, North- 

 wood ; the smaller patches in Concord, Holderness, Sandwich, Warner ; 

 those on the west side of the state, in Richmond, Keene, Surry, Acworth, 

 Alstead, Croydon, Newport, Grafton, etc. Add to these the beds of 

 quartz found in the Bethlehem, Huronian, and Coos groups. 



I have notes of operations upon some of these beds. In Sandwich, some openings 

 were made in 1877, in the "White ledge," one mile north-west of Sandwich centre, 

 with the high-sounding name of " Diamond Ledge Gold Mine." No pure gold is visi- 

 ble. The operators claim an average yield of $49 to the ton. 



In Ossipee, a quartz band from four to eight rods wide occurs on the south side of 

 Pocket hill, near the house of Obed Sanders. The quartz is unusually crystalline and 

 open, traversed by numerous veins of the same material, and also by granite. No 

 metals or ores are seen in it. 



The " silver mine" in the same town, on the land of Jonathan D. Sias, presents sim- 



