179.101—How does the Secretary distribute principal and income to the holder of a life estate?
(2)
Where the vested holders of remainder interests and the life tenant have not entered into a written agreement approved by the Secretary providing for the distribution of proceeds; or
(3)
Where, by the document or agreement or by the application of State law, the open mine doctrine does not apply.
(i)
Invest the principal, with interest income to be paid to the life tenant during the life estate, except in those instances where the administrative cost of investment is disproportionately high, in which case paragraph (b)(4) of this section applies; and
(ii)
Invest all proceeds attributable to any contingent remainderman in an account, with disbursement to take place upon determination of the contingent remainderman.