Freebase(0.00 / 0 votes)Rate this definition: Minera. Minera is a small village, and a local government community, the lowest tier of local government, part of Wrexham County Borough in Wales. The community, which in addition to Minera village includes a number of smaller hamlets such as Gwynfryn and New Brighton and large areas of farmland, had a total population of 1,608 at the 2001 census.