92 Copper and Silver of Kewenaw Point, Lake Superior. 
The fine sifted ore being washed, yielded 8 lbs. 12 ounces 
more of metal, mixed with heavy ferruginous particles of rock. 
This being dissolved gave 1 1b. 1 ounce of copper and silver, 
which when separated yielded 101 grs. of silver, and 1 lb. 2 oz. 
of copper. The silver then in the fine washings is equal to 345 
Ibs. to the ton, and the copper from the same is equal to 250 ve 
Then 50 lbs. me: the rock yield— 
Coarse plates of metal, . , " 8 lbs. 13 oz. 
Fine washed ore, . ‘ ‘ : 8 lbs. 12 oz. 
Amount of washed metal in 50 lbs. rock, 17 lbs. 9 oz. 
or 35 lbs. 2 oz. per 100 Ibs. of rock, or 700 lbs. per ton. 
The value of the coarse sifted metal after washing is per ton 
as follows— 
For silver, 25 lbs. in a ton at $20 per lb. $500 00 
For copper, 1257 lbs. per ton at 16 cts. per lb. 201 12 
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Value of the coarse metal, . : : $701 12 
’ A ton of the fine sifted ore, washed and reduced as above de- 
scribed, yields— 
Silver, 3,4; lbs. at $20 per lb. . ; : $68 
Copper, 250 lbs. at 16 cts. per lb. : AO 
Value of one ton of fine washings, s - $108 
The value of the rock per ton is as follows. Jt yields in 50 
Ibs., silver 763°8 ors. = 1744, 0z.; equal to 4 lbs. 5 oz. 3644 grs. 
per ton; value, $87 25. Copper in 50 Ibs. of rock, 6 Ibs. 94 oz. 
= per ton 263 lbs.; value, $42 10. Value of one ton of the 
rock, $129 35. 
Resumé.—In the rock the value is $129 35 per ton. 
In the coarse ore, —_ silver = $500 copper, = $201 
In the fine washings, “ = 68 pn | 
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Silver, $568 Copper, $241 
Total value of one ton of clean metal, $809. 
It is to be observed that the large sheets of copper which oc- 
casionally occur in the crevices, are not considered in this ac- 
count; and since they probably will be found not unfrequently 
in the mine, they will go to augment the value of its produce. 
The best flux for the fusion of the fine washings, which will 
be smelted at the mines, is carbonate of lime or calcareous spar, 
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