Kutanga kuma1880 Black Diamond yaiva nzvimbo yemigodhi yemarasha kumaruwa.
Zvechokwadi, shanduro yakaoma zvikuru yemutsara ndeyekuti "Kutanga muna 1880s Black Diamond yaiva nzvimbo yemigodhi yemarasha yemaruwa, yakagadzirwa neBlack Diamond Coal Mining Company yeCalifornia, iyo yakanga ine uye yakashanda mugodhi".