Reviews — Potash in the United States. 



281 



(b) Maiiganiferous iron-ore. 



(c) Iron-ore. 



The quantity of mineral existing is reported to be large, and the 

 output in recent years has been appreciable. 



The manganiferous deposits, mostly of low grade, in the United 

 States, the output of which before 1914 was insignificant, produced 

 in 1918, with the help of dressing plants, about half a million tons, 

 containing upwards of 35 per cent manganese. The fall in the 

 selling price of manganese ores, subsequent to the Armistice, caused 

 the closing down of most of the deposits, but owing to the present 

 scarcity of mineral and the high price obtained for it, it is probable 

 that they will be again operated. 



In the Lafayette Brazilian deposits at present worked, the altera- 

 tion from carbonate to oxide continues in depth, but in a number of 

 others originally spessartite the leached portion is shallow. As in 

 India a number of deposits of the lateritic tyj)e have been similarly 

 disappointing. 



The volume would have been improved by some notes on the 

 manufacture of manganese-iron alloys and a list of the firms engaged 

 in their production. 



United States Potash Production. 

 Potash in 1917. By H. S. Gale and W. B. Hicks. Min. Res. 



United States, 1917, part ii, pp. 397-481. 1919. 

 T\URING the year 1917 the shortage of potash due to the War 

 ^ reached its most acute stage, and it is therefore of particular 

 interest to read in this interesting and valuable report the steps 

 that were taken at that time, and the success which was achieved, 

 in meeting the difficulty as it affected the United States. The 

 following table summarizes the production during the year under 

 review : — 



The report should be in the hands of all who are interested in the 

 potash industry, tor it includes not only a very full account of 



