The deposits of the useful minerals & rocks; their origin, form, and content . rus, is admirablysuited to the Bessemer process. This ore is found in rocks of Silurian ageas well as in the Carboniferous limestone, though only the occurrences inthe latter are of any practical importance. Both formations consist of analternation of limestones with shales and sandstones. While however theore-bearing limestones display thicknesses of 100 m. or more, the inter-bedded sandstones and shales are generally only 1 m. in thickness andseldom reach as much as 4 metres. The ore-bodies are usually fissme-fill
The deposits of the useful minerals & rocks; their origin, form, and content . rus, is admirablysuited to the Bessemer process. This ore is found in rocks of Silurian ageas well as in the Carboniferous limestone, though only the occurrences inthe latter are of any practical importance. Both formations consist of analternation of limestones with shales and sandstones. While however theore-bearing limestones display thicknesses of 100 m. or more, the inter-bedded sandstones and shales are generally only 1 m. in thickness andseldom reach as much as 4 metres. The ore-bodies are usually fissme-fillings and pockets such as thatillustrated in Fig. 367, though some are quite irregular and penetrate deep 824 OEE-DEPOSITS into the limestone. They are not always at the same horizon but mayoccur in any layer, from the lowest, lying immediately upon the Silmian, tothe highest forming the base of the Grit and Yoredale Rocks at Whitehavenand Fmness respectively. The shape of the deposit varies greatly accordingto the degree to which the limestone has surrendered to Fig. 366.—Diagraiumatic section of tlie Parkside irou deposit. J. D. Kendall. At Bigrigg, Crowgarth, and Parkside, the ore-bodies are irregularmasses immediately under the iNIillstone Grit, which, as illustrated in , may form the actual hanging-wall. In other cases bed-like bodiesare formed which may be 65 feet or more in thickness. The superficial extent of these occurrences may sometimes be qmteconsiderable ; that for instance at Parkside covers 18 acres, or 72,000
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
