| (a) | - | to expenditure by way of infructuous or abortive exploration expenses in respect of any area surrendered prior to the beginning of commercial production by the assessee ; |
| (b) | - | after the beginning of commercial production, to expenditure incurred by the assessee, whether before or after such commercial production, in respect of drilling or exploration activities or services or in respect of physical assets used in that connection, except assets on which allowance for depreciation is admissible under section 32 : |
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