44 Wisconsin and Missouri Lead Region. 
E'stimate of Expenses of Reverberatory Furnace. 
Wages per month, as above, $150. Board four hands 
four weeks, $48, #198 00 
Ore 10,500 Ibs. daily for 26 dave, at $1 se 1000 Ibs. . 4095 00 
Wood, 52 cords, at say $2, ‘ 104 00 
Wailing ore to furnace, 273,000 Ibs. at say 75 ois. per 1000, 204 75 
Wiuting lead to Galena, 79 pigs daily, at 2U cts. per 100, 287 56 
4889 3h 
Worth of 2054 pigs of lead at Galena, . , . 4313-40 
Besides this produce is the amount of slag made, of the value 
of which it is impossible to make a correct estimate. The only 
way perhaps by which we may approximate it, is as follows:— 
Supposing the ore originally to be worth 75 per cent. of lead, the 
273,000 pounds then contain 204,750 of metal, of which 60,970 
are missing ; allow ten per cent. for loss in the furnace, (escaping 
in fumes of the oxide and sulphate of lead,) and there remain 
54,873 pounds of lead, which must be in the slag. Taking 
average pieces of this slag, which consists of a mixture of pure 
lead, unaltered galena, sulphate of lead, and earthy matters, 
grinding them thoroughly, and submitting portions of the powder 
to analysis, fusing one portion with carbonate of soda, and digest- 
another many days in dilute nitric acid, and then fusing the 
insoluble remainder with dry carbonate of soda, I obtained the 
following result, neglecting the sulphur and sulphuric acid: 
Silica, . 15 per cent. 
Sulphate of lead obtatwed by the etic of coats 
ing nitric acid on the sulphuret, precipitated 
by hydrosulphuric acid, gave lead, ; 34.30 “ 
Peroxide of iron, . , 24.53.“ 
The 54,873 pounds of lead require ctheniliies 160,000 pounds of 
slag, when this contains 34.30 per cent. of lead. It seems a fait 
allowance that this should be worth one third as much as the 
original ore, or $5 per 1000 lbs. =$820. Adding this sum to the 
value of the lead made, we have $4313 40+$820= $5133 40 
From which deducting the expenses, ght einer 3L 
Leaves as the profit per month, . $244 09 09 
This estimate gives a small feturt for the amount of capital 
employed, but it must be observed that it is made out under the 
