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 amendments (1) The item relating to section 617 in the table of sections for part I of subchapter I of chapter 1 of the Internal Revenue Code of 1986 is amended to read as follows: Sec. 617. Amortization of certain mining exploration expenditures. . (2) Section 56(a) of such Code, as amended by section 128(b)(2), is amended by striking paragraph (2). (3) Section 59(e) of such Code, as amended by section 128(b)(3), is amended— (A) in paragraph (2)— (i) in subparagraph (B), by inserting or at the end, (ii) in subparagraph (C), by striking the comma at the end and inserting a period, and (iii) by striking subparagraph (D), and (B) by striking paragraph (5) and inserting the following: (5) Dispositions In the case of any disposition of property to which section 1254 applies (determined without regard to this section), any deduction under paragraph (1) with respect to amounts which are allocable to such property shall, for purposes of section 1254, be treated as a deduction allowable under section 263(c). . (4) Section 170(e) of such Code is amended— (A) in paragraph (1), by striking 617(d)(1), , and (B) in paragraph (3)(D), by striking 617, . (5) Section 263A(c)(3) of such Code, as amended by section 128(b)(5), is amended by striking 291(b)(2), or 617 and inserting or 291(b)(2) . (6) Section 291(b) of such Code, as amended by section 128(b)(6), is amended— (A) in the heading, by striking and mineral exploration and development costs , (B) by striking paragraph (1) and inserting the following: (1) In general In the case of an integrated oil company, the amount allowable as a deduction for any taxable year (determined without regard to this section) under section 263(c) shall be reduced by 30 percent. , (C) in paragraph (2), by striking or 617(a) (as the case may be) ,