Records of the Geological Survey of India, Volume 76, Part 10Geological Survey of India, 1942 - Earthquakes |
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Page 40
... less than 2 cwts S. D. B. per acre . In 1939 licenses to mine mica in the mica belt were possessed by over 100 persons , and the number of important companies with annual production of over 1,000 maunds was about 11 or 40 DUNN : Mica .
... less than 2 cwts S. D. B. per acre . In 1939 licenses to mine mica in the mica belt were possessed by over 100 persons , and the number of important companies with annual production of over 1,000 maunds was about 11 or 40 DUNN : Mica .
Page 50
... companies it is impossible , in certain cases , to determine the average quality of their production ; some firms do not cut or sort all their mica , but sell it as crude , others cut but do not sort , and sell it as mixed cut block ...
... companies it is impossible , in certain cases , to determine the average quality of their production ; some firms do not cut or sort all their mica , but sell it as crude , others cut but do not sort , and sell it as mixed cut block ...
Page 61
... companies which , in addition to carrying out extensive mining , are dealers and export- ers , are Chatturam Horilram , Ltd. , and the Indian Mica Supply Co. Messrs . Rajgariah Bros. at one time undertook extensive mining operations but ...
... companies which , in addition to carrying out extensive mining , are dealers and export- ers , are Chatturam Horilram , Ltd. , and the Indian Mica Supply Co. Messrs . Rajgariah Bros. at one time undertook extensive mining operations but ...
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Common terms and phrases
2nd quality albite amount approximately average Bihar Bihar mica Black dotted Black spotted block and splittings block mica built-up mica Calcutta Canada cleavage condenser films condenser plates countries country rock crude mica dealers diopside district electrical exported block feet felspar Geological Survey Giridih grade granite ground mica Heavily stained 1st high quality mica India Indian mica insulation Intermediate stained J. A. Dunn Kodarma Kodarma Reserved Forest large number larger sizes Lepidolite loose splittings M. S. Krishnan Madagascar Madras mainly manufacture mica belt mica exported mica industry mica mining mica produced mica splittings mica trade mica-schists micanite microcline miles muscovite obtained pegmatites percentage phlogopite potash felspar pyroxenite quality block mica quartz quartz core Rajputana Rajputana mica recent recorded ruby mica schists scrap mica sheet mica Short tons smaller solutions South stained 1st quality stoping Survey of India Table 13 trimmed United uparchalla veins washers