Used substantially, 'used substantially' for the pur-pose of the mine or a number of mines under the same management, in relation to workshops. The use of the word 'and' makes both the conditions conjunctive. Sub-clause (xi) uses the words 'if solely used' for the location of the management, sale of liaison offices, or for the residence of officers and staff, of the mine, in relation to lands and buildings. The difference in language between the two expressions 'used substantially' and 'solely used' is obvious. It is therefore, possible to contend that lands and buildings appurtenant to a coal mine, if not exclusively used for purposes of the colliery business, would not come within the definition of mine in s. 2(h), i.e., it would depend upon the nature of user, and that the crucial date is the date of vesting, New Satgram Engineering Works v. Union of India, AIR 1981 SC 124: (1980) 4 SCC 570: (1981) 1 SCR 406.
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