ang (“iron”) + sabar (“delved mine”) #[His.] habar as the regular form might be possible as well.
Sindarin
anghabar
place name. Iron-delvings
Anghabar
noun. iron mine
sabar
delved mine
(i habar, o sabar), pl. sebair (i sebair). Isolated from the name Anghabar, ”iron mine”. The root SAPA ”dig, excavate” (QL:82) suggests that this -habar is a lenited form of ✱sabar. If the unlenited form is actually ✱habar, read: habar (i chabar, o chabar), pl. hebair (i chebair).
sabar
mine
(i habar, o sabar), pl. sebair (i sebair). Isolated from the name Anghabar, ”iron mine”. The root SAPA ”dig, excavate” (QL:82) suggests that this -habar is a lenited form of ✱sabar. If the unlenited form is actually ✱habar, read: habar (i chabar, o chabar), pl. hebair (i chebair).
A mine in the Echoriath (S/138), translated as “Iron-delvings” by Christopher Tolkien in the Silmarillion Appendix (SI/Anghabar). Its initial element is clearly ang “iron” (SA/ang), so its second element must mean “delving”, possibly a lenited form habar of the word ✱sabar (attested only in compounds).