ON THE DETRITAL TIN-ORE OF CORNWALL. 215 
Pendelow is drained by aid of a water-wheel about six feet 
in diameter ; from Levrean and Pit-moor the water escapes through 
open drains. 
The bed and banks of a brook which rises in Red-moor, north- 
east of Helmen-Tor,* bear—near its confluence with the Roche 
river—traces of having been ransacked at some earlier period ; 
but at present they remain unwrought. Nearer to its source, 
however, operations—though on a very small scale—are still con- 
tinued.t| But, notwithstanding they are within two miles of 
stream-works still in progress on the moors of Saint Austell, and 
occupy neighbouring portions of the same granite, the detrital 
deposits worked in them are of widely different character. 
Lower Creany, a part of Red-moor, in Lanlivery, exhibits ;— 
(QD). IRB Gooode0aG 50a00 00 b0 00000000 0000 90000000408 2 to 3 feet ;— 
(2). Granitic (though slightly quartzose) clay of greyish 
hue, mixed with lamine of slate................ 1 footto3 ., :— 
(3). The tin-ground, composed of angular, subangular and 
spheroidal masses of pale-brown quartz, fragments 
of felspar, mottled—dark-blue and yellowish-brown 
—clay, and granitic gravel; thinly mixed with 
rounded masses of tin-stone and both perfect and 
fractured crystals of tin-ore. Flints of consider- 
able size occur at intervals, and particles of gold 
less frequently ........ 90 dio oomod GO Ue'saoe ato foetec= 
The roots of marsh-plants Sette: to a depth of 2 or 3 feet, into the 
tin-ground. 
The Shelf,—of pale buff-coloured clay—presents a very uneven surface. 
At Upper Creany (Wheal Prosper)—in the same parish, and, 
indeed, in an adjoining part of the same swamp—the order of 
succession is ;— 
(U))s IRS oc coc 0b ogDo VODs HODdUbODOOGO ON OGGOU00DN 00ND 6 inches ;— 
(2). Granitic clay, frequently mixed with lamin of yellow- 
S10, SEND coodsaducc0p 000000 go00D0000 seeeeeeel foot to 3 feet ;— 
* “The Helmen Tors....display...one or two secondary Logan rocks.” 
Parochial History of Cornwall, iii, p. 32. 
+ “In 1853, a curious image, about nine inches high, made of tin, and 
‘(representing a man, was found nine feet beneath the ground in a Jew’s 
“house or stream work in Lanlivery parish. It weighed 9 lbs., and had 
‘some Hebrew [characters] on it.” Aten, History of Liskeard, p. 27. 
Note. 
+ Some few years since this peat was quite three feet thick; but, of 
late, ‘the neighbouring cottagers have taken great part of it for fuel. 
