Only about 10 of the currently known deposits may have sufficient grade and size to be considered for future mining, although it must be stressed that information on the thickness of most of these sulphide deposits is limited.
目前已知的矿藏中，仅约10％的品级和数量值得考虑去开采，不过必须强调，关于大部分硫化物矿藏厚度的信息有限。