Kammala jumla mai zuwa: Duk da haka, bayan WWI, an sauya sauyawa zuwa man fetur zuwa wasu yankuna, ciki har da layin dogo, wanda ya kasance muhimmin mahimmanci a cikin matsalolin tattalin arziki wanda ya buge da kwalba bayan yakin. An kara fadada ayyukan kwal a ƙarshen karni na sha tara, kuma masu mallakar kwal na Welsh sun kasa saka hannun jari a cikin aikin injiniya. A lokacin yakin basasa na Kudu Wales Coalfield yana da mafi ƙasƙanci yawan aiki, mafi girman farashi da ƙananan riba a Birtaniya. An ci gaba da wahala a lokacin
1926 yajin aiki, babban koma bayan tattalin arziki na 1930s, yakin duniya na biyu da kuma bayan haka. Littafin 1937 "The Citadel" da littafin 1939 "How Green Was My Valley" (daga baya aka yi fim, tare da "ƙauyen ƙauyen" wanda ba daidai ba ne) ya bayyana irin wannan wahala, kamar yadda waƙoƙin Idris Davies mai hakar ma'adinai, malami da mawaƙin Rhymney.