263A(c)(3) of such Code is amended by striking 616, . (6) Section 291(b) of such Code is amended— (A) in paragraph (1)(B), by striking 616(a) or , (B) in paragraph (2), by striking , 616(a), , and (C) in paragraph (3), by striking , 616(a), . (7) Section 312(n)(2)(B) of such Code is amended by striking 616(a) or . (8) Section 381(c) of such Code is amended by striking paragraph (10). (9) Section 1016(a) of such Code is amended by striking paragraph (9). (10) Section 1254(a)(1)(A)(i) of such Code is amended by striking , 616, . (c) Effective date The amendments made by this section shall apply to expenditures paid or incurred in taxable years beginning after the date of the enactment of this Act. 129. Amortization of certain mining exploration expenditures (a) In general Section 617 of the Internal Revenue Code of 1986 is amended to read as follows: 617. Amortization of certain mining exploration expenditures (a) In general Any expenditures paid or incurred for the purpose of ascertaining the existence, location, extent, or quality of any deposit of ore or other mineral, and paid or incurred before the beginning of the development stage of the mine, shall be allowed as a deduction ratably over the 84-month period beginning on the date that such expense was paid or incurred. (b) Mid-Month convention For purposes of subsection (a), any expenditures paid or incurred during any month shall be treated as paid or incurred on the mid-point of such month. (c) Exclusive method Except as provided in this section, no depreciation or amortization deduction shall be allowed with respect to expenditures described in subsection (a). (d) Treatment upon abandonment If any property with respect to which expenditures described in subsection (a) are paid or incurred is retired or abandoned during the 84-month period described in such subsection, no deduction shall be allowed on account of such retirement or abandonment and the amortization deduction under this section shall continue with respect to such payment. . (b) Conforming