ON THE DETRITAL TIN-ORE OF CORNWALL. 239 
from one of the stream-works in the Saint Austell moors contained 
Gold ce ccesecccunesecsees Beste cecsteescanel oOplee 
SIUAVGIEs) GaSe coe sans ceE Sanne sae seis dass aaein ses 9:05 
Silica with sesqui-oxide of iron ......... 0°83 
1OOns 
Notwithstanding the occurrence of gold in every part of Corn- 
wall which has afforded stream-tin-ore, the quantities discovered 
have been so small that the entire produce of the county has, 
probably, amounted to no more than a few pounds weight ;fF and, 
In New Granada detrital-gold and mine-gold afforded respectively— 
Detrital-gold........ 90°700 gold........ 9°300 silver ;— 
Mine WeMelercle ei ieren Ocal Ome me ctrtfalercecl O79 OO Mere. 
Boussineauur, Annales des Mines, 3me Série, i, p. 446. 
‘“‘The Mexican tin is extracted by means of washing, from the alluvious 
‘lands of Guanaxuato, San Felipe, Robledal, and San Miguel el Grande, 
‘cas well as in the intendancy of Zacatecas.. .One of the [tin] ores most 
“‘gommon in Mexico is the wood-tin of English mineralogists.” HumsBoxprt, 
New Spain, (Translated by John Black), iii, p. 296. 
“Tn Australia tin-ore was first recognized, amongst the black sands 
“brought from the gold-fields, by Mr. George Foord, on the 11th March, 
“1853. Stream-tin is found in the Beechworth district, in the tributaries 
‘“‘of the Lenderderg, at Gympie, in the tributaries of the Yarra, in the bed 
‘“‘of the Thomson, and in many feeders of the Latrobe; [as well as] in 
“the Strathbogie ranges,...and at Taradale....The wash dirt varies in 
‘thickness from a few inches to six feet. On the slate rock gold alone is 
“sought for, but on the granite bottom tin-ore is alsofound. Previously to 
‘©1868 the export of black sand and tin-ore had been 2,650°7 tons ;— 
aa tit. GegoodesaobaoD 00s Westen BD) po 
Smytu, (R. B.), The Gold-fields and Mineral districts of Victoria, pp. 42, 
131, 412, 413. 
‘On the borders of the granite near Cape Raja, in the province of 
“‘ Soengei-Liat.. .gold is found in the sand on the sea shore. The gold is. 
‘found there with tin-ore, and it occurs in the same way at the top of various 
‘small valleys, in the provinces of Blinjoe and Djeboes.” Van Disst, 
Banca and its Tin Stream-works, (Translated by Clement Le Neve Foster, 
B.A., D.S., F.G.S.), p. 64. Note 
* Forbes, (D.), London, Edin: and Dublin Phil: Mag: xxxvii, (1869), 
p. 323. 
+ ‘‘ Native gold.. .has in one instance been discovered in a cross-course 
“at Huel Sparnon, and also in the gossan of Nangiles in Kea.” Gansy, 
Oornwall Geol: Trans: vii, p. 90. 
“From a portion of a quartz-vein at Davidstowe I obtained, in 1852, a 
“trace of gold, and reported the fact to the Geological Society of Cornwall 
«Recent experiments on the gossaniferous quartz from this locality, have 
‘“‘ shown that it is not merely auriferous, but, in some small portions at least, 
‘highly so.” Parrison, Quarterly Journal of the Geological Society, X, p. 248. 
E 3 
