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In the appended tables will be found tlie aggregate product of eighteen mines, 

 for the years 1854 and 1855, presenting, in a condensed form, the results of 

 each ; and for the items from which these figures have been derived, the reader is 

 referred to the history of the individual views in the preceding pages. 



From these returns, some approximate estimate may be made of the character 

 and importance of this branch of employment, and the position that we maintain 

 as a mining State, compared to one of the greatest mining nations on the globe. 



In carefully reviewing the operations of the English, Welsh and Irish mines, 

 for forty-three years, and those of Cornwall and Devon, the close of 1847 pre 

 sents us with some interesting facts and figures relating to the product of those 

 mines, and by which we may form some estimate of the value of our own. 



From the Welsh, Irish, and English, mines, there were raised and sold in 

 forty-three years the amount of 417,040 tuns of copper ores, being the product of 

 ninety-one mines for the above period. Upon this ore I place an average value of 

 fourteen pounds sterling per tun, being a higher sum than would be claimed for 

 those ores by those best acquainted with their value. 



Their aggregate would therefore be equal to $29,192,800, giving an average 

 product for each year from the ninety-one mines of $681,730 per annum. 



The product of one hundred and three mines of copper in Cornwall and Devon, 

 ending in 1847, amounted to 37,000 tuns, which, at the same price as the above, 

 gives us an aggregate of $13,076,015 as their value. 



The total number of mines engaged, it will be seen, amounts to the number of 

 one hundred and ninety-four, the aggregate product of which in value, is $42,- 

 268,815. 



This shows us an average per annum, from the total number of mines, of the 

 sum equal to $972,763. 



During 1854 eleven of the gold mines of this State produced $777,790 ; and in 

 1855 eighteen mines produced the amount of $2,216,697, being an increase of 

 $1,438,907 over that of the preceding year. The aggregate product in value 

 from the total number of mines in two years being $3,016,951. Tims we find 

 that the mines of copper of the United Kingdom, and amounting to one hundred 

 and ninety-four in number, do not produce an annual aggregate in value equal to 

 eighteen mines of gold in our own State. 



RECAPITULATION OF THE PRODUCT OF ENGLISH COPPER MINES. 



91 Irish, Welsh and English Mines produced in forty -thrfce years 



the value of $29,192,800 



103 Mines of Cornwall and Devon, ending at same date 13,760,015 



Total. $42,952,815 



Aggregate and average product per annum $972,763 



RECAPITULATION OF THE PRODUCT OF CALIFORNIA GOLD MINES. 



11 Gold Mines of California produced in one year, 1854 $777,790 



18 " " " " " 1855'.... 2,239,161 



Total $3,016,951 



Aggregate and average product per annum $1,625,520 



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