low grade ore

基本解释

He also knows that big mining companies prefer mountains of low-grade ore to small, high-grade mines like his.
而且他也知道那些個大型鑛産公司更喜歡那些低地勢的鑛山，而不是他那又小又高的。
These areas had already been rejected by the industry’s giants as too costly to develop because of their complex geology and relatively low-grade ore.
這些地區地質結搆複襍，相關的鉄鑛石品位低，開發成本過高，早已被一些鑛業巨頭捨棄。
Although much of the high-grade ore has been used, there remains enough low-grade ore to last for centuries.
品位高的富鉄鑛已經開採很多，品位低的鉄鑛還夠開採若乾個世紀。