caving method वाक्य

उदाहरण वाक्य

1. Cates introduced the profitable block-caving method at Ray, one of the new porphryr copper mines being opened at a grand scale at the time.
2. The mine produces copper and cobalt from three sources : Mindola Shaft, Central Shaft and South Orebody Shaft . Vertical crater retreat is the predominant mining method while sublevel open-stopping and sublevel caving methods are also used.