Kammala wannan jumla: Tare da hanyoyin sufuri na zamani da suka mamaye kwarin, masu hakar ma'adinai na gida sun kalubalanci
Babban yajin aiki na 1926. Lokacin da kwal mai kyau ya zama mafi sauki, kwal na gida ya zama maras so kuma an rufe ma'adinai na karshe a 1929. Mazauna yankin sun yi aiki da ragowar ɗakunan sama da hannu har zuwa tsakiyar shekarun 1930.