238 REVIEWS 



prices prevailing, the quantity mined falling off less than i per cent. 

 The product of the United States was considerably more than that of 

 all other countries combined. Of this Montana produced 38 per 

 cent., the Lake Superior region 26 per cent., and Arizona 22 per cent. 

 Statistics are given showing the cost of operation and the profits of 

 various mines, with a resume of the foreign and domestic copper trade. 



Lead. — The value of the lead mined in 1901 was $23,280,200, this 

 being something less than that of the preceding year. Idaho stood 

 first in production, Colorado second, and the Mississippi valley 

 districts third. Important developments of lead properties are now 

 going on in southeast Missouri, and it is believed that a material 

 increase of output will follow. 



Zinc. — The value of the zinc production was $11,265,760. The 

 quantity mined was the greatest in the history of the industry, being 

 25 per cent, of the world's production. More than half of this ore 

 came from the Joplin, Mo., district. The features of the year were 

 the removal of smelting properties to the Kansas natural-gas district 

 and a futile attempt to consolidate the smelting interests. 



Aluminum. — The Pittsburg Reduction Co. is the sole producer of 

 aluminum in the United States. The value of the product was 

 $1,920,000, this being half the output of the world. As an electrical 

 conductor, aluminum continues to increase in favor. Beauxite, the 

 ore of aluminum, was mined in Georgia, Alabama, and Arkansas. The 

 new field at Beauxite, Ark., is one of great promise. 



Quicksilver. — The production of $1,382,305 came chiefly from 

 California, though Texas contributed a small amount. The ores being 

 worked are very lean, and the outlook for increased production is 

 unpromising. 



Precious stones.- — The production of the United States was $289,- 

 050, while the importation was $22,815,352. The jewelry trade is a 

 very sensitive barometer of the general financial situation, and the 

 great importation of precious stones clearly reflects the remarkable 

 prosperity of the country. 



W. H. E. 



