20 ECONOMIC GEOLOGY. 



vein, not of much width, is said to have assayed ^30 in gold and $10 in 

 silver to the ton. I have seen specimens of free gold from this mine. 



Other openings are upon the clay slate area close to the conglomerate 

 near stakes V 14 and 15 (Vol. II, p. 296), or the Bartlett mine; the west 

 part of Jason Titus's farm in Lyman; upon B. Dow's land, near stakes 

 B 19 and 20; and in Bath, near the east border of the slate area. Here 

 Smith brook falls over a ledge, at whose base is a tunnel, about twenty 

 feet long, made many years since. I found a few specks of free gold in 

 the quartz in small veins just below the tunnel. Other cjuartz veins have 

 been recognized while collecting specimens in the field, none of which 

 are known to be auriferous by actual test. 



Go/d in the Conglomerate. Attention was very early called to the 

 presence of gold in the interesting band described with minuteness in 

 Volume II as the auriferous conglomerate. It is regarded as older than 

 the veins in the clay slate, and for that reason perhaps is not so rich. 

 No extensive excavations have been made in this rock, but it is very 

 commonly slightly auriferous. Almost every section of it will furnish 

 auriferous samples. Authentic assays have been made from several 

 localities, such as the following : 



A sample from the field north of the Cook and Brown mine (Hiram 

 Knapp's land), afforded to Prof. Seely gold at the rate of 90 cts. to the 

 ton. Another determination from a neighboring locality showed 75 cts. 

 to the ton. A well known auriferous ledge of this sort is at the house 

 of Jacob Williams. A ledge of quartzose conglomerate crops out by 

 the roadside, perhaps forty feet high and equally thick. This ledge, two 

 hundred and eighty-two feet in length, is one outcrop of a very in- 

 teresting division of the gold rocks, whose windings and faultings have 

 been carefully studied by us and represented upon both our maps. It is 

 an ancient gravel, now consolidated, but it is not known whether the gold 

 was deposited in the original placer, or introduced in small veins at the 

 subsequent period of elevation. The company's statement represents 

 that assays of from six to eight hundred pounds of rock have given 

 them from five to seven dollars* of gold to the ton, and on account of 

 the facility with which thousands of tons can be obtained from the mass, 

 think that an average yield at these rates would be remunerative. The 



* In one case, $9.99 in currency. The latest experiment shows #3 per ton. 



