I giacimenti di Utah . rom minerale di argento. Ho la storia e la produzione. 141 57-54: 51-48- 45^42:39: 236: z 3O Q- u 0 33: mi/> :z o : i z j 20 27- h-o 3 : Q o ; 2h18- 15-12: 9- - ?6l ? 3: 0- 3- -J 17- 1 1 Io ho / /// / // // / 1 1^ i / // / / 4 1 1 1 1 ( 111 ii / ^ r^.. 1,1 /? / 1 / 1 ^- I // N i 5f- 4- Avera [e eperf pric /// 1 r N / -^ ( Prodi iction-/^alore- - 1900 1905 1910 1915 figura 23.-diagramma che mostra la produzione annuale, il valore e il prezzo medio di zinco in Utah, 1904-1916. 1920 142 ORB depositi dello Utah. Zinco. La produzione di zinco in Utah iniziò nel 1904e ha rapidamente incre

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The ore deposits of Utah . rom silver ore. I HISTORY AND PRODUCTION. 141 57-54: 51-48- 45^42:39: 236: z 3O Q- u_0 33: i/> :z o :_i z j 20 27- h-o 3 : Q o ; 2h18- 15-12: 9- - ?6l ? 3: 0- 3- -J 17- 1 1 i i / /// i / // // / 1 1^ i / // / / 4 1 1 11 1 ( 111 ii / ^ r^.. 1, 1 /? / 1 / 1 ^- I // N i 5f— 4- Avera [e pric eperf /// 1 r N / -^ ( Prodi iction-/^alue- - 1900 1905 1910 1915 Figure 23.—Diagram showing the yearly production, value, and average price of zinc in Utah, 1904-1916. 1920 142 ORB DEPOSITS OF UTAH. ZINC. The production of zinc in Utah began in 1904and has rapidly increased, though as yet (1917)it has not become of great importance in com-parison with the other metals. Previous to1904 it was universally regarded as detrimental. Figure 24.—Diagram showing the relative production of zinc from theprincipal districts of Utah, 1904-1916. and is still so considered in many of the leadores. Lead ores containing above a pre-scribed percentage of zinc are penalized by thesmelters. The zinc production has been derived chieflyfrom lead-zinc sulphide ore, in which the lead and zinc are partly separated and raised tocommercial grade by milling, and from oxidizedzinc ore (mainly zinc carbonate) of a gradethat permits of shipment without concentra-tion. Some sulphide ore, notably that fromthe Horn Silver mine, has also been shippeddirect. The annual production, value, and price ofzinc from 1904 to 1916 are shown in figure 23.The total output and value from the principaldistricts to the close of 1917 are given in thetable below, and the relative importance of thedistricts is shown in figure 24. Zinc produced in Utah to end of 1917, by districts. District. Pounds. Value. Park City 66.191.18518. 792, 29633, 507, 51940, 052,

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1920