A mineral interest means the interest which is created by an instrument transferring, either by grant, assignment, or reservation, or otherwise an interest, of any kind, in any subsurface mineral.[ 1984 c 252 s 2.]
"Mineral interest" defined.
RCW 78.22.020 — under Chapter 78.22 Extinguishment of unused mineral rights..
RCW 78.22.020