; and (B) section 20 of the Geothermal Steam Act of 1970 ( 30 U.S.C. 1019 ). (f) Wolf creek storage field development rights (1) Conveyance to secretary As a condition precedent to the relinquishment of the South Thompson Divide Leases, a leaseholder shall permanently relinquish, transfer, and otherwise convey to the Secretary, in a form acceptable to the Secretary, all Wolf Creek Storage Field development rights of the leaseholder. (2) Limitation of transfer Any interest acquired by the Secretary under paragraph (1) shall be held in perpetuity and not transferred, reissued, or otherwise used for mineral extraction. 7. Methane leasing in the Lower North Fork Valley (a) Inventory Not later than 1 year after the date of enactment of this Act, the Secretary shall complete, or shall collaborate with agencies of the State or with institutions of higher education in the State to complete, an inventory of all significant emissions of methane in the North Fork Valley, Colorado, including methane emissions from active, inactive, and abandoned coal mines. (b) Leasing program (1) In general Not later than 1 year after the date of completion of the inventory required under subsection (a), the Secretary shall carry out, to the extent permissible under applicable law, a program to offer for lease Federal methane from active, inactive, and abandoned coal mines, subject to valid existing rights. (2) Conditions The program carried out under paragraph (1) shall— (A) only include methane that can be collected and transported in a manner that does not— (i) endanger the safety of coal mine workers; or (ii) unreasonably interfere with ongoing operations at coal mines