The deposits of the useful minerals & rocks; their origin, form, and content . boundary between payable loose ore and thefoot-wall dolomite is not definite, while at other places where a light yellowdolomite occmS, there is a sharp separation; a crust of high-grade manganeseore, however, usually covers the irregular dolomite surface. Against thehanging-wall clay also, the outline of the ore-body is not w^ell defined, thisclay descending into irregular, pocket-like holes in the ore. The thicknessvaries greatly, reaching sometimes as much as 30 m., though on an averageit is but 8 metres. The qua
The deposits of the useful minerals & rocks; their origin, form, and content . boundary between payable loose ore and thefoot-wall dolomite is not definite, while at other places where a light yellowdolomite occmS, there is a sharp separation; a crust of high-grade manganeseore, however, usually covers the irregular dolomite surface. Against thehanging-wall clay also, the outline of the ore-body is not w^ell defined, thisclay descending into irregular, pocket-like holes in the ore. The thicknessvaries greatly, reaching sometimes as much as 30 m., though on an averageit is but 8 metres. The quality of the ore also varies considerably ; poor clayey massesof lens- or funnel shape occur in the deposit. The ore consists principallyof loose hmonite, in which patches of pyrolusite, poHanite, wad, andmanganite, occur. The average composition of the ore won is approxi-mately 20 per cent of iron and 20 per cent of manganese, so that it is atypical iron-manganese ore. On the market it is known as Fernie ore afterthe name of the former owner of the mine. VOL. II 2 a to s o. Fig. 384.—Map showing the position of the metasomatic linionite and iron-manganese depositsof the Taunns and the Soonwald.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
