. Bulletin of the scientific laboratories of Denison University. Art. IX.] Watson, Manganese Ore-Deposits of Georgia. 167 ing proportions. With the exception of the mineral wad, the ore is usually partially or entirely crystalline, of a dark steel- blue color, and the nodular type which prevails nearly always displays the complete or partially layered or concentric structure of concretionary masses. Fig. Section in One of tiie Openings at the Dobbins Mine, near Cartersville, Georgia, Siiowing the Occurrence of Manganese-Ore in the Residual Clays. (Modihed from Penrose.) A, fragments and ma
. Bulletin of the scientific laboratories of Denison University. Art. IX.] Watson, Manganese Ore-Deposits of Georgia. 167 ing proportions. With the exception of the mineral wad, the ore is usually partially or entirely crystalline, of a dark steel- blue color, and the nodular type which prevails nearly always displays the complete or partially layered or concentric structure of concretionary masses. Fig. Section in One of tiie Openings at the Dobbins Mine, near Cartersville, Georgia, Siiowing the Occurrence of Manganese-Ore in the Residual Clays. (Modihed from Penrose.) A, fragments and masses of partially decayed rock ; B, manganese-ore ; C, residual clay. Horizontal and vertical scale, i in. = lo ft. Associated Ore-Deposits.—Extensive deposits of brown iron-ore and gray or specular hematite, yellow ocher, and to a less extent barite and bauxite occur somewhat closely associa- ted with the manganese-ores. Of these the deposits of iron-ore and yellow ocher have been extensively mined. The bauxite and barite are of less importance, since the former is only spar- ingly found within the limits of the district, and the latter, while more abundant, is not sufficiently concentrated to admit of profitable working. These are again referred to at some length in a subsequent part of this paper under the origin of the manganese-ores. Manganiferoiis Iron-Ores.—The beds of brown iron-ore, which is the prevailing type of iron-deposit in the district, are usually distinct from, though occurring in close relation Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Denison University; Denison Scientific Association. Granville, Ohio : [The University]
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