Special reports on the mineral resources of Great Britain . at 35°. The ore-l)ed, which is overlain bythick-bedded hard hrown grit and red gritty limestone, and isseparated from the Silurian shales and flags below by a 4-inchband of dark-red sandstone, varies in thickness from 5 to 20 consists of two layers : an upper band of carbonate and blackoxide of manganese,- with an average thickness of 2 ft. (varyingfrom 7 in. to 7 ft., with occasional pockets up to 8 ft. thick), 1 See also I)e Ranee. Trans. Manchester Geol. Soc., vol. xvii (1882-4). p. 47,and Coll. Guard., vol. xliv, 1882
Special reports on the mineral resources of Great Britain . at 35°. The ore-l)ed, which is overlain bythick-bedded hard hrown grit and red gritty limestone, and isseparated from the Silurian shales and flags below by a 4-inchband of dark-red sandstone, varies in thickness from 5 to 20 consists of two layers : an upper band of carbonate and blackoxide of manganese,- with an average thickness of 2 ft. (varyingfrom 7 in. to 7 ft., with occasional pockets up to 8 ft. thick), 1 See also I)e Ranee. Trans. Manchester Geol. Soc., vol. xvii (1882-4). p. 47,and Coll. Guard., vol. xliv, 1882, p. 895. Also * Geol. of Rhyl, Abergele, andCohvyn (Mem. Geol. Sun:). 1885, pp. 55, 56. ^ Special Reports on Mineral Resources {Mem. Geol. Surv.). vol. i. Tungstenand Manganese Ores, ed. 2, 1916. p. m. 24 UNBEDDED IRON ORES and a lower band of red hsematite, which varies in thickness(inversely as the manganese-band) between 5 ft. and 20 ft. Thiscompound ore-bed follows the dip of the country-rock, and anyreserves would presumably lie to the The haematite appears to have been discovered1872, and Nant-uchaf is first mentioned in the M about the yearineral Statistics DERBYSHIRE 25 in 1874; it is absent in 1876-79, and finally disappears after ore was won by shafts. Some of the deeper of these had beenabandoned by 1882. At that period three were being used bythe Abergele Haematite Company; ISb. 1, to the rise, being -45 ; JNo. 2 (the engine-shaft), 80 yards away to the deep, being108 ft. in deptn; while No. 3, 60 yards farther to the deep, was126 ft. Aboring, carried down for 45 ft. info the Silurian rocks,found no ore in them. In following the dipway from No. 1 to No. 3 shaft, haematitewas worked for a distance of about 200 yards from No. 1. In theshallower part of the mine, down to a depth of 90 i^^^., theore-body is said to have been 30 to 45 ft. in width; beyond this,down to 40 yards depth, it narrowed down to 24 ft., and themanganese-bed grew tli
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