The deposits of the useful minerals & rocks; their origin, form, and content . r example that occurring north ofOberrossbach ; and a second intercalated between clay-slate and Tertiarybeds, as for example that occm-ring at Koppern where no hmestone hasyet been met. At Oberrossbach, where mining operations are stiU only upon a smallscale, the dolomitized Stringocephalus hmestone, which has so far beenexposed for a length of one kilometre, dips on an average about 50° south-east. This hmestone is irregularly fractured and forms the immediatefoot-wall of the deposit, the hanging-wall of which con
The deposits of the useful minerals & rocks; their origin, form, and content . r example that occurring north ofOberrossbach ; and a second intercalated between clay-slate and Tertiarybeds, as for example that occm-ring at Koppern where no hmestone hasyet been met. At Oberrossbach, where mining operations are stiU only upon a smallscale, the dolomitized Stringocephalus hmestone, which has so far beenexposed for a length of one kilometre, dips on an average about 50° south-east. This hmestone is irregularly fractured and forms the immediatefoot-wall of the deposit, the hanging-wall of which consists of Tertiarysands and clays. The ore occm-s in pockets, bmiches, and valley-hke THE METASOMATIC MANGANESE DEPOSITS 865 channels, along the crushed and steeply inclined boundary between lime-stone and slate, the intercalated slaty, clayey, and sandy layers beingevidence of its transported character. The thickness of the depositsvaries greatly ; while along the channels this reaches 10-20 m., on thecrests of the Umestone the deposit is often entirely absent. The ore-bed. Fig. 382.—Transverse section of the manganese deposits north of 1 : 2200. Einecke and Kuhler. consists of limonite with variable manganese content, and of pocket-hke segregations of pyrolusite and psilomelane. The geological positionis indicated in Fig. 382. A second bed, having apparently no connection with Umestone,occurs about 1 km. to the west. This is probably the westerly continuationof the steeply inclined portion of the eastern deposit. It has been openedup for a length of 300 m. and to a depth of 100 metres. It is distinguished
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
