METALS AND THEIR ORES. 2I 
whole width is traversed by segregated veins in which pyrites and an- 
kerite are abundant, while specks of galena and copper have been seen. 
An opening once greatly talked of is situated on the Steery farm east 
of Williams’s. It has been known as the “Dow ledge” at the Pittsburg 
mine. It is a cliff of the same conglomerate, 50 or 60 feet high, and has 
been opened slightly. 
On the most eastern band of this rock is the “Gordon mine.’ There 
are conspicuous masses of pryites, probably magnetic, in this opening 
upon the top of the hill. Only a few blasts have been put in here. The 
conglomerate has assayed from $3 to $10 to the ton. On the west side 
of the crest of this hill a larger excavation has been made in a better 
appearing part of the rock. 
What I conceive to be the same conglomerate has recently been dis- 
covered in the edge of Landaff, about a mile and a half east of Lisbon 
village, and known latterly as the Allen mine. The ledges of it are ex- 
posed upon the “poor-” or town-farm for more than half a mile in length, 
with the usual north-east strike of the country, dipping 50° or 60° north- 
westerly. Upon this farm are several alternations of rock,—five or six 
of quartz, four of slate, two of conglomerate, and a siliceous limestone, 
possibly encrinital. The county rock is regarded as the lower part of 
our Huronian, though resembling the Lyman group. The most valuable 
vein here is from two to four feet wide, carrying much of a dark pyrites, 
staining the hands. Much free gold has been found in it. I have visited 
it twice, and obtained gold readily by washing the crushed selected frag- 
ments. I saw three small excavations. More recent cuttings have been 
made; and the parties interested claim that the quartz averages about 
#30, while the selected specimens of pyrites have yielded at a rate of 
$700 to the ton. They have uncovered the vein for a distance of 100 
feet, and excavated occasionally to the depth of 8 feet. The gold occurs 
mostly in small grains in the decomposed rock, in company with a little 
galena. 
The same conglomerate I have discovered north of the Atwood mine, 
and it is undoubtedly continuous to the similar outcrop on Salmon Hole 
brook (Vol. II, p. 324). It runs towards the coarser conglomerate of 
North Lisbon. It is claimed to extend in the other direction—the south- 
west—towards North Haverhill. 
