SOUTH OF REDRUTH AND CAMBORNE, ETC. 653 



Wheal Frances, South Condurrow, and Wheal Grenville produced in 

 1876 83,452 tons of tin-stuff, which yielded 1846 tons of clean tin- 

 ore, or at the average rate of about 2| per cent. In fact the Great 

 Flat Lode alone yielded more than one eighth of the total quantity 

 of tin-ore obtained in Cornwall. 



In conclusion, I desire most heartily to thank the agents of the 

 various mines I have described for their readiness to afford me all 

 the information in their power, and for the permission to publish 

 this brief account of some of their workings.* 



EXPLANATION OF PLATE XXX. 



Plan and Sections of Workings on the Great Flat Lode south of Eedruth 

 and Camborne. 



* For the Discussion on this paper see p. 658. 



