Political and commercial geology and the world's mineral resources
Science
Political and commercial geology and the world's mineral resources
Geology, Economic; Mines and mineral resources
In _Chile_, manganese ores occur at Corral Quemada, and nearby
districts in the State of Coquimbo. In these districts, beds of
manganese oxides are interlayered with sandstone, shale, and volcanic
flows. Manganese is also found in the Carrizal district in the State
of Atacama, where beds of manganese oxides are interbanded with shale
and limestone. From 1885, when explorations were begun, to 1905, the
exports of manganese ores from Chilean ports amounted to 549,716 tons,
the maximum exports for one year being 50,871 tons, in 1892.
In _Uruguay_, deposits of ferruginous manganese ore, reported to
contain 80,500,000 tons, occur at Zapucay, in the Department of Rivera.
=Europe.=--In the former empire of _Austria-Hungary_, the principal
manganese district is near Dorna Vatra, in Bukowina. Here there are
lenses of manganese carbonate and silicate in schists that have
weathered to oxides near the surface. The deposits are owned by
the Bukowina Greek Church. The average annual production from 1906
to 1912 was 13,600 tons. Other deposits are reported in Bohemia,
Istria, Styria, Hungary and Bosnia. Since 1901, the production of
Austria-Hungary has ranged from 18,000 to 25,000 tons annually.
In _Belgium_, near Chevron, in the Province of Liège, ferruginous
manganese oxides have formed by the weathering of manganese and iron
carbonates. Since 1901, the annual production in peace times has ranged
from 2,000 to 15,000 tons.
In _France_, manganese occurs chiefly near Romaneche, in the Department
of Saone and Loire, where several bodies of manganese oxides lie in a
fault between sedimentary rocks and granite. The deposit has been known
since 1823, and the production in 1901 was 9,500 tons. Other French
deposits have been explored in the Departments of Hautes-Pyrenees,
L’Ariege, L’Allier, L’Ande, and La Nievre. The annual production rather
steadily declined from 22,000 tons in 1901 to 6,000 tons in 1913. The
ownership of the French manganese deposits seems to be largely French,
possibly aided by some English capital.
In _Germany_, manganese ore of the better type, containing over 30 per
cent. of the metal, occurs in Sachsen-Gotha, Central Germany, in small
veins of manganese and iron carbonates weathered near the surface to
oxides. A similar grade of manganese ore occurs in small quantities at
Hessen and Waldeck, in Rhenish Prussia.
Manganiferous iron ore, containing from 12 to 30 per cent. of
manganese, occurs in Hessen-Nassau, Rhenish Prussia, where manganese
and iron oxides form irregular flat lenses imbedded in clays derived
from the weathering of underlying Devonian limestone. During the period
1907 to 1911, nine deposits yielded 262,000 to 283,000 tons annually.
Public-domain text, read in full here on John Shaqi.
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