...issue. In the Black Hawk * case the lease was to continue "during the term commencing on the first day percentage, specified in subsection (b), of the gross...depletion).... In no case shall the allowance for depletion under section 611 be less than it would be if computed without reference to this section....

...§ 613. Section 613(a) provides that "the allowance for depletion . . . shall be the percentage ... of the gross income from the property excluding from...property (computed without allowance for depletion)." Opinion of the Court 464 US royalty5 received, whether there was production of the underlying mineral...

...depletion shall be 27 J /2 per centum of the gross income from the property during the taxable year, excluding from such gross income an amount equal to...of the property. Such allowance shall not exceed 50 per centum of the net income of the taxpayer (computed without allowance for deple-' tion) from the...

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...sulphur mines or deposits, 23 per centum, of the gross income from the property during the taxable year, excluding from such gross income an amount equal to...of the property. Such allowance shall not exceed 50 per centum of the net income of the taxpayer (computed without allowance for depiction) from the property,...