TIN DEPOSITS OF NEW SOUTH WALES. 105. 
' [ was not able to examine the section of this shaft as itis lined, 
but some of the material on the surface, which is included in the 
first 90 feet of sinking, appears to consist of a fine-grained fel- 
spathic ash, which has been converted, at places, by decomposition 
into clay, and these ash beds are found in other sections under- 
lying the basalts. 
The bottom in Bailey’s mine is of great interest. It consists of 
felspar porphyry in part, resting upon slates, each of these con- 
stituting the bottom in different parts of the mine. The following 
section will illustrate their relations, and is taken along the course 
of the tunnel :— 
Section along tunnel in Bailey’s Claim. 
T. Tunnel from which wash-dirt has been removed :— 
a. Slates. b. Felspar porphyry. c. Sediment overlying the tin-wash. 
and I believe a similar section was met with in the old workings. 
This felspar porphyry, which is called granite locally, is looked 
upon as the main bottom in the distric , as a general rule, 
such is undoubtedly the case. It is of the greatest importance, 
however, to place on record the fact that at one point in this 
mine there is an undoubted instance of a tin gutter on this 
rock, the lead of tin being overlain by a rock which corresponds 
in all respects with the lower one. This section is cut across 
a small prospecting drive, in the side of which it can be seen, as 
follows :— 
Section alony prospecting drive in Bailey's Mine. 
a. Felspar porphyry. b. Tin-wash. e. Felspar porphyry (tufa ?). 
