Green’s Dictionary of Slang

mine n.

also mines

[1900s–10s; 1950s+] (US Und.; latterly US black) myself, me; usu. as for mine.

In phrases

go for mines (v.) (also take care mines) [black var. on SE mine]

[1990s+] (US black teen) to look after oneself, to indulge one’s own interests.