﻿Tol. 64.] HIGH-LEVEL PLATFOEMS OF BODMI]!^ MOOE. 395 



peat starting from the opposite side showed that a large portion was 

 untouched, the peat being of considerable thickness and undisturbed. 

 Samples from the dirt below gave fairly favourable results on the 

 whole, and there seems to be a reasonable prospect of success here 

 in the future workings, if waterlogging is avoided. In view of the 

 sheet of peat to be removed in the centre of the marsh, it certainly 

 seems as if some far more efficient agent would be required than 

 shovels and wheelbarrows for removing the overburden. 



Further trials have been made on the hill-side near Fowey Well, 

 where the old streamers had already turned over the narrow band 

 of assorted or concentrated material. The material at the margin of 

 the latter, on being tested, gave fairly good results ; while the part 

 already worked proved still to contain a considerable amount of tin. 

 But a new method is being tried here ; a small reservoir has been 

 made as far up the hill as possible, and the water brought down in 

 canvas-pipes, thus delivering a powerful jet against the loose 

 deposits. The washed material passes over a wooden ftough as 

 before, and the ore collects on this, owing to its greater weight. It 

 is too soon yet to express any opinion as to the results of the new 

 departure. 



From the foregoing observations it would seem reasonable to 

 believe that in the higher parts of the Bodmin-Moor Granite there 

 is still a considerable amount of tin left in the unassorted wash, 

 bordering the true gravels, but the ore is more disseminated than 

 in the latter. Even in these, however, there appears to be still 

 left more than was expected ; and moreover there are patches left 

 unworked here and there, owing to waterlogging. The most 

 important point, however, in connexion with the restarting of the 

 stream-work is the sudden rise in the value of wolfram ; practically 

 the whole of this has been left, and much of the tin associated 

 with it. A number of localities have been ascertained where this 

 material is fairly abundant, and further enquiries will be made in 

 the ensuing season ; the knowledge is mainly confined to the old 

 streamers, who are not very willing to impart it, as it obviously has 

 a pecuniary value. 



The Connexion between the 750-foot Platform and a 

 China-Clay Working. 



The detailed survey of the Bodmin-Moor Granite has shown that 

 all the more extensive marshes, through which only small streams 

 flow, have a floor of kaolinized granite. This material, however, 

 is valuable only if it leaves a soapy film without a trace of grit, 

 when rubbed with the fingers. A very large amount of good 

 china-clay does occur in these marshes, but there is a great impedi- 

 ment to its being worked. This impediment lies in the superficial 

 deposits, previously described as having been recently thickened. 



