1054 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [ PaRT TV : 
It has already been explained on page 1016 that the ore-belt is 
regarded as composed of decomposed and chemically altered rocks 
of igneous origin, to the fresh form of which the name kodurite 
series has been applied — after the Kodur mine. These intrusives 
consisted chiefly of acid rocks such as quartz-felspar-rock and 
felspar-rock (the felspar being orthoclastic), with segregations 
of more basic rocks, such as apatite-spandite-orthoclase rocks 
(kodurite), apatite-pyroxene-spandite-orthoclase-rock (pyroxene- 
kodurite), pyroxene-rock, spandite-rock, and pyroxene-spandite-rock, 
arranged as patches and streaks in the non-manganiferous intrusives. 
Subsequently the whole of this mass of intrusives has been subjected 
to intense chemical action, so that the felspar has been converted 
into lithomarge, and the manganiferous rocks into manganese- ores. 
In the description of the various deposits the various pieces of evidence 
wiU be given from which the conclusions as to origin given in 
Chapter XII have been drawn. 
From 1892 to 1907 the Kodur mines have produced 276,364 tons 
of manganese-ore, giving an average of 17,273 
tons a year, the details being as follows : — 
Years. Long tons. 
1892 674 
1893 3,130 
1894 11,410 
1895 15,816 
1896 26,869 
1897 . • 23,947 
1898 27,800 
1899 29,312 
1900 28,163 
1901 18,210 
1902 14,748 
1903 15,985 
1904 12,065 
1905 14,752 
1906 16,048 
1907 17,435 
Total . 276,364 
