112 NEW YORK STATE MUSEUM 



the western limb of " 21 " to flatten and come over to the fault, 

 there must be a displacement of at least 300 feet. If the western 

 limb of " 21 " rolls upward to the fault this |hrow will be dimin- 

 ished. We must not assume a purely vertical throw, since increas- 

 ing experience brings home to us the conviction that almost always 

 faults involve a diagonal shift along the fault plane. 



• Assuming therefore that Old Bed and Welch are the same ore 

 body and are the faulted representative of the western limb of 

 "21," an assumption which is corroborated by the similarity of 

 the ores, we may follow out the curious convolutions presented 

 by them. In sections 14 and 15 they are very indefinite and are 

 mostly known by drill cores. The stray ore body shown in No. 15, 

 on the center line, was revealed by a drill hole. Its identity is not 

 known. The other one in No. 14, east of the fault and 200 feet 

 below the Tefft shaft is also of uncertain relationship. Old Bed 

 is first recognizable in this section, although little is accurately 

 known about it. The ore grew small as followed many years ago 

 and the workings were abandoned. In No. 13 Old Bed was found 

 double, but again was not extensively opened. We know little 

 about it. In No. 12 it develops a steplike roll of its own and is cut 

 into two parts, by the small fault into which the trap dike has 

 forced its way. At No. 11 the dike has pinched out and the fault 

 was not noted. The ore is anvil-shaped and curiously pinched 

 below. In No. 10 it is a reversed S-shaped fold and the core of 

 rocks begins to manifest itself on the west, which is of great impor- 

 tance in the next sections. It is similar to those in the Joker- 

 Bonanza ''21 " fold, but dips west instead of east. It rises toward 

 the surface and ultimately cuts off Old Bed proper, from its down- 

 ward prolongation, the Welch bed, until finally beyond No. 6, Old 

 Bed runs out into the air and is lost. Meantime the Welch limb 

 runs along and rises, with a lima bean pod cross section until it too 

 goes into the air. Within the last year or two a new shaft has been 

 sunk to tap the Welch ore on the line of section No. i, so that we 

 now know that this ore continues downward lower than was for- 

 merly shown. More recent data also show that in No. 7, rock cuts 

 off the ore on the east, apparently before the upward curve of the 

 ore was found and a fault is suggested. 



In its western prolongation as shown in sections 8-12, Old Bed 

 encounters faults and an area of broken ground with one or two 

 disconnected masses of iron-stained, apatite-bearing ore called 

 " Red Ore." The red color is due to the crush and to the conse- 

 quent alteration of some of the minerals. In the slides the color 



