Kammala wannan jumla: Betteshanger ita ce mafi girman ma'adinan kwal a Kent Coalfield, wanda ke amfani da dubban ma'aikata masu aiki a cikin wani matattarar da ke ƙasa da ƙasa. Ma'adinan yana da suna don rikici kamar yadda yawancin ma'aikatan ma'adinai da suka dauki ayyuka a can bayan da aka bude shi a 1927 an sanya su a cikin jerin sunayen baƙi daga ma'adinai a wasu sassan kasar don ayyukansu a lokacin yakin basasa.
Babban yajin aiki na 1926. Ma'aikatan ma'adinan sun yi yajin aiki a 1938 saboda yadda ake bi da matasa ma'aikata a ma'adinan.