When things belonging to different owners have been united so as to form a single thing and cannot be separated without injury, the whole belongs to the owner of the thing that forms the principal part. However, that person shall reimburse the value of the residue to the other owner or surrender the whole to the other owner.
Mont. Code Ann. § 70-4-102
Uniting several things -- to whom whole belongs
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.