The deposits of the useful minerals & rocks; their origin, form, and content . lite,etc., simultaneously with thedeposition of the ore. In manyrespects the occurrence at Salaagrees closely with the ordinarysilver-lead-zinc deposits. Theoccurrence of salite, tremolite,etc., constitutes however a marked difference which, according to Vogt, may perhaps be explained inthat the minerahzation took place mider physical-chemical conditions similarto those obtaining at the formation of contact-metamorphic deposits. Mining upon this particular deposit began in the year 1500 andreached its zenith in the
The deposits of the useful minerals & rocks; their origin, form, and content . lite,etc., simultaneously with thedeposition of the ore. In manyrespects the occurrence at Salaagrees closely with the ordinarysilver-lead-zinc deposits. Theoccurrence of salite, tremolite,etc., constitutes however a marked difference which, according to Vogt, may perhaps be explained inthat the minerahzation took place mider physical-chemical conditions similarto those obtaining at the formation of contact-metamorphic deposits. Mining upon this particular deposit began in the year 1500 andreached its zenith in the first half of the sixteenth century. The totalproduction amounts to some 400 tons of silver, made up as to 200 tonsobtained from 1510-1600 ; 63 tons from 1601-1700 ; 37 tons fiom 1701-1800 ; and 87 tons from 1801-1908. Latterly the production of silverhas almost ceased, w^hile that of lead has always been small. Zinc on theother hand is now being mined ; at Sala therefore, as vnth. many otherlead-zinc deposits, zinc mining has with time taken the place of Z Diabasp dyke. Faults. Via 357.—Cross section of the Sala , 1910. 774 OEE-DEPOSITS The Woelds Production of Lead- and Zinc Ores and theirDistribution among the different Classes of Ore-Deposit This we begin by a statement of the production of metalUc lead andzinc taken from yearly compilations of the MetaUurgishe Gesellschaft ofFrankfort: ^ Lead. 1 Zinc. 1900. 1905. 1910. 1900. 1905. 1910. Tons. Tons. Tons. Tons. Tons. Tons. Germany . 121,500 152,600 157,900 i 154,572 197,184 227,747 Belgium 16,400 22,900 39,600 119,231 145,592 172,578 Holland 6,953 13,767 20,975 Great Britain 35,500 23,300 30,500 30,307 50,927 63,078 FranceSpain 17,000154,500 24,100180,700 21,000191,600 J42,117 50,369 59,141 Austria-Hungarj 11,900 13,500 17,500 1 7,086 13,305 Italy . 23,800 19,100 16,000 9,357 Greece 16,700 13,700 16,800 1 Sweden 1,400 600 300 Russia 200 300 1,200 i 5^968 7,642 8^631 Asiatic-Turkey 2,800 10,
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