CARBONATE INCLINE. 423 



slickensides indicate a certain amount of movement or displacement along 

 the steep eastern face of the ridge or fold. At about one hundred feet from 

 the incline the drift bends under that of the next level above, and from here 

 on follows in its sinuosities the line of contact, which has a steep dip to the 

 eastward. From the point where the ore is struck in this drift almost to its 

 northern extremity, the ore extends eastward to the two next lower levels and 

 into the ground of the Little Giant claim, in a practically continuous body 

 of iron-stained sand carbonates, generally one foot to two feet in thickness, 

 only interrupted here and there by ridges of undecomposed limestone, reach- 

 ing up to the porphyry contact. This ore sheet has a steep dip to the east- 

 ward, say on an average from 25° to 30°, and evidently stands on the east- 

 ern slope of the fold; it would seem, therefore, that the dome-shaped uplift 

 in the limestone body between the fourth and sixth levels south of the incline 

 has narrowed into a sharp ridge in the incline itself, and that it has then 

 become a monoclinal fold to the north, the ore body extending over the 

 line of its crest and partly down its eastern slope into the trough. 



The sixth level north is run for fifty feet on a barren contact, following 

 the curve of the limestone ridge, then passes into an ore body extending 

 right and left with a steep dip to the eastward, while the end of the drift 

 bends sharply to the eastward and runs into the overlying body, in which 

 the eastward dip is shown in the rude bedding planes. 



The seventh level north for the first hundred feet is run in White 

 Porphyry, more or less iron-stained or decomposed and probably some 

 distance above the contact; limestone then comes up into the floor, covered 

 by a streak of black iron and white Chinese talc a foot in thickness. Imme- 

 diately beyond, a body of ore three sets high has been stoped out, which 

 evidently represents the ridge of limestone, now entirely replaced by ore. 

 This ore ridge at its maximum height is only about twent}' feet in width, 

 liaving a roof of breccia material consisting of fragments of black chert 

 -and quartzite in a matrix of clay and decomposed porphyry. The limit of 

 the pay-ore body is found at a comparatively short distance east of this 

 drift, the developments on the eighth level showing only a barren contact. 



The north drift on the eighth level follows in its right fork the eastern 

 boundary of the trough east of the ridge, and is cut in a yellow ocherous 



