ORIGIN AND DEVELOPMENT OF ORE-DEPOSITS. 301 



South Caradon Mine, Jope's South lode. 

 ,, Pearce's lode. 



,, Bowling's lode. 



„ Vivian's (N.) lode. 



Class VI. — Newer Tin Lodes. 



These appear to be essentially tin veins, only containing 

 copper exceptionally, and then apparently as a filling after 

 re-opening. Veins of this age are particularly numerous in the 

 St. Agnes district. The following may be taken as examples : — 



The Wheal Peevor tin lode, which courses nearly E.W. and 

 underlies south, about 2 feet in a fathom. This lode varies in 

 width from 3 to 30 feet, with an average width of about 8 feet, 

 "and has been generally found richest where it is widest." (See 

 J. Williams, Trans. Geol. Soc, London, IV, p. 139). 



The Penhall's "dowright" lodes are also apparently of this 

 period. They are 3 or 4 in number — course nearly E.W., and 

 average 1 foot in width. Some of the lodes at Polberrow (South 

 House lode and Great Gozzan lode), at West Pink Mine (Great 

 Gozzan lode, and Carrow's lode), the Great Flat lode on the 

 south side of Carn Brea Hill, and the Budnick Gaunter lode are 

 probably of this age. 



Class V. — Older Tin Lodes. 

 Of these some (in the Parish of St. Just) have a N.S. 

 course ; others in the St. Agnes district and near Eedruth course 

 E.W., and are either perpendicular or dip northward, intersect- 

 ing and heaving any elvans they may encounter. The following 

 list includes all the lodes that I have been able to 

 provisionally to this age : — 



Botallack, Crown's lode. 



,, W. Hazard lode. 

 Boscaswell Downs lode. 

 West Spearn, Great Work Scovan. 



,, Spearn Scovan. 



West Bellon, West Owles lode. 

 North Downs, Main lode. 

 ,, Pendarves's lode. 



„ Tenpenny lode. 



