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shall be taken into account in computing the adjusted basis of the mine or deposit, but such amounts, and the adjustments to basis provided in section 1016(a) (10) shall be disregarded in determining the adjusted basis of the property for the purpose of computing a deduction for depletion under section 611. SEC. 616. DEVELOPMENT EXPENDITURES. (a) IN GENERAL.—Except as provided in subsection (b), there shall be allowed as a deduction in computing taxable income all expenditures paid or incurred during the taxable year for the development of a mine or other natural deposit (other than an oil or gas well) if paid or incurred after the existence of ores or minerals in commercially marketable quantities has been disclosed. This section shall not apply to expenditures for the acquisition or improvement of property of a character which is subject to the allowance for depreciation provided in section 167, but allowances for depreciation shall be considered, for purposes of this section, as expenditures, (b) ELECTION OF TAXPAYER.—At the election of the taxpayer, made in accordance with regulations prescribed by the Secretary or his delegate, expenditures described in subsection (a) paid or incurred during the taxable year shall be treated as deferred expenses and shall be deductible on a ratable basis as the units of produced ores or minerals benefited by such expenditures are sold. In the case of such expenditures paid or incurred during the development stage of the mine or deposit, the election shall apply only with respect to the excess of such expenditures during the taxable year over the net receipts during the taxable year from the ores or minerals produced from such mine or deposit. The election under this subsection, if made, must be for the total amount of such expenditures, or the total amount of such excess, as the case may be, with respect to the mine or deposit, and shall be binding for such taxable year. (c) ADJUSTED BASIS OP M I N E OR D E P O S I T. — The amount of expenditures which are treated under subsection (b) as deferred expenses shall be taken into account in computing the adjusted basis of the mine or deposit, except that such amount, and the adjustments to basis provided in section 1016(a)(9), shall be disregarded in determining the adjusted basis of the property for the purpose of computing a deduction for depletion under section 611. PART II—EXCLUSIONS FROM GROSS INCOME Sec. 621. Payments to encourage exploration, development, mining for defense purposes.
and
SEC. 621. PAYMENTS TO ENCOURAGE EXPLORATION, DEVELOPMENT, AND MINING FOR DEFENSE PURPOSES.
There shall not be included in gross income any amount paid to a taxpayer by the United States (or any agency or instrumentality thereof), whether by grant or loan, and whether or not repayable, for the encouragement of exploration, development, or mining of critical and strategic minerals or metals pursuant to or in connection with any undertaking approved by the United States (or any of its agencies or instrumentalities) and for which an accounting is made or required to be made to an appropriate governmental agency, or any forgiveness § 615(d)
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