Mae nodi, cofnodi a chategoreiddio'r holl domenni glo segur yng Nghymru mewn un gronfa ddata ganolog, nad oedd yn bodoli o'r blaen, wedi golygu ymdrech enfawr.
“It has been a mammoth undertaking to identify, record and categorise all disused coal tips in Wales into a single central database, which did not exist before.