ang (“iron”) + sabar (“delved mine”) #[His.] habar as the regular form might be possible as well.
Sindarin
anghabar
place name. Iron-delvings
Elements
Word Gloss ang “iron” sabar “delving”
Anghabar
noun. iron mine
sabar
mine
1) (delved mine) #sabar (i habar, o sabar), pl. sebair (i sebair). Isolated from the name Anghabar, ”iron mine”. The root _
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).
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
noun. delved mine
The unmutated form is reconstructed from the place name Nornhabar, assuming that the second word is mutated in composition. Though habar as the regular form might be possible as well, in the Qenyaqetsa we find the root SAPA "dig, excavate" (PE/12:82), so it seems most likely that Tolkien re-used this old base, and that the underlying form in those names would indeed be sabar
rhûd
mine
*rhûd (construct rhud, with article ?i thrûd or ?i rûd the lenition product of rh- is uncertain) (dwelling underground, artificial cave, rockhewn hall), pl. rhuid (?idh ruid). (PM:365).
rhûd
mine
(construct rhud, with article ?i thrûd or ?i rûd – *the lenition product of rh- is uncertain) (dwelling underground, artificial cave, rockhewn hall), pl. rhuid (?idh ruid). (PM:365)*.
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).