Ressources minérales des États-Unis, 1917--partie I--métaux . e de la feuille de zinc est resté presque stationnaire, à partir de l'année à 21 cents la livre, diminuant à 20 cents le 25 avril et à 19 cents le 26 avril, où le chiffre est resté jusqu'à la fin de l'année. Les prix pour 1914-1917, inclusivement, sont indiqués à la page 858.le prix moyen obtenu pour tous les zinc laminés vendus au cours de l'année était de 17,5 cents, comparativement à 18,4 cents en 1916. La poussière de zinc au début de 1917 a été citée entre 20 et 33 cents la livre, selon la qualité. Le prix est tombé à 16 à 20 cents à la mi-mai et au remai

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Mineral Resources of the United States, 1917--Part I--Metals . e of sheet zinc remained nearly stationary, starting the year at 21 cents a pound, declining to 20 cents on April25 and to 19 cents on April 26, at which figure it remained until theend of the year. Prices for 1914-1917, inclusive, are given on page 858.The average price obtained for all rolled zinc sold during the yearwas 17.5 cents, as compared with 18.4 cents in 1916. Zinc dust at the beginning of 1917 was quoted at from 20 to 33cents a pound, depending on quality. The price dropped to 16 to 20cents by the middle of May and remained nearly stationary untilthe end of the year, closing*at 16 to 17 cents a pound. The averageof quotations for the year was 19.9 cents, but the average price ob-tained for all zinc dust sold during the year was 16.6 cents a pound. PRICE CURVES, 1914-1917. Plate VII shows graphically for the years 1914-1917 the relationsof the weekly average St. Louis price of zinc, the weekly average Lon-don price of zinc, the weekly average price of 60 per cent zinc blende. ZINC. 879 concentrates at Joplin, Mo., and the weekly sales of concentrates inthe Joplin region as a whole. The price of zinc has been taken frommarket reports, and the price of zinc blende and the figures of weeklysales are those published in the Joplin daily papers. To eliminatethe sharp weekly fluctuations and to obtain a curve more easily com-parable with the price curves, the weekly sales have been averagedby months, the result being shown by the broken lines. The curve of the London price of zinc for the first seven months of1914 shows that zinc was about two-fifths of a cent higher in St. Louisthan in London. Through this period the price was about at a level.With the outbreak of the war London became the center of the de-mand for zinc for munitions and the London price became higherthan the St. Louis price except for short intervals. The curve is veryirregular, with a sharp rise during the early months of the war,

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