Report on the Geological Survey of Connecticut. 161 
copper, and since the removal of the convicts ih os ce this 
mine has been wrought again. 
“The following is the report of Mr. Joun B. Jenxins of Swan- 
sea, Wales, of his trial made in 1830, upon four parcels of the ore :-— 
cwt. qrs. Ibs. per cent. cwt. qrs. Ibs. 
NG. 1. wt 4 0b via produce..13" metal, 6. 2 
2, Heinen 121 O22 
3, Zin tin 43 0 0 Qi 
4, 4 2 24 102 0 1 26 
Pee a ai PY 2°26 
«««The quality of the copper in each parcel is very much the 
same, and may be said to be of the average quality of English cop- 
per; but their smelting qualities are below the average, being rather 
refractory. ‘The expense of smelting the above ores, per ton of 21 
ewt. will be for No.1, £2119; No.2, £299; No.3,£1 188; 
No. 4, £280, exclusive of all custom house charges. The ores, 
if there were any quantity of them now for sale, would bring the 
following prices, viz :— 
““*No. 1, about £9 9 6 Atthe present rate of exchange, $44 84 
2, 8 96 ‘40 10 
= 2196 14 08 
4, 7 96 | 35 38 
Average, 2) O #33 60 
«©¢These are the prices as near as I can judge of them, or as 
much as a smelter could now give for them at Swansea, the miners 
to pay freight to this place, and all expenses of ware-housing, sam- 
pling, &c. &c.’ 
“¢ In order to show the richness of these ores when compared with 
those of Cornwall, the following statement of the produce of the 
English mines for three years, is subjoined from the same docu- 
ment.” 
Years. Tons of ore. Tons of cop. Rate p.c. Value per ton. Total value. 
1815. 79,984 6607 77, £6130 £532,10800 
PSG) 482/442... 6,968) 8 6105 937,621 00 
HSE 8135727), 6,608... 8.4. 6116 410,936 0 0 
Variegated copper ore, in rich veins, has been uncovered by G. 
W. Bartholomew, in Bristol ; the veins are in a granitic rock and in 
place, and it is suggested by Mr. Shepard, that the copper found in 
the red sandstone and in the trap of Connecticut, may have resulted 
Vou. XXXITI.—No. 1. 21 
