The public lands contain approximately 20% of the nation's commercial forest land, as well as large amounts of minerals such as copper, mercury, and nickel.
全国约20%的商业林地是公共土地，这些土地同时也蕴藏着大量的铜、汞、镍等矿产。
2
Under the condition of producing qualified nickel concentrate, the increase of nickel recovery is limited in a bench test and commercial test by strengthening pulp dispersion and desliming.