  Our aim in this paper is to investigate some types of lightlike submanifolds
in metallic semi-Riemannian manifolds. We study invariant and screen
semi-invariant lightlike submanifolds of metallic semi-Riemannian manifolds and
give examples. We obtain the conditions for the induced connection to be a
metric connection. Also, we find necessary and sufficient conditions for the
distributions involved in the definitions of such submanifolds to be
integrable.
