146 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 23, 



where matters of course, are here of necessity reduced to mere 

 inferences. 



Dimensions of the Lode. — The Cobre lode, as at present known, is 

 limited in its crop to a distance of about a mile, but it probably 

 ranges further to the east. Near the eastern extremity a branch is 

 given off, making an angle of about 30°, and proceeding south-west. 

 At the bifurcation, which is well seen on the steep banks of the 

 Cobre River, both lode and branch are nearly vertical, and the latter is 

 large ; but as it proceeds it becomes irregular, and is broken up and 

 intersected by numerous threads and strings. The main lode is cut 

 off to the west by a cross course, after being heaved by several slides 

 of small amount. See fig. 3. 



Fig. 2. — General Map of the Country around Cohre. 



Scale of Geoffrofihicai MxTes. 



(The arrows mark the dips.) 



Although the whole extent of the lode, as known by the crop, 

 extends to 1800 yards or thereabouts, it is but a small part of this 

 that can be regarded as valuable. The whole workings on the prin- 

 cipal vein are limited to a linear extension of 800 yards, and the 



