The Jinchuan Ni-Cu deposit in Northwest China, with ore reserves of 500 million tons at Ni and Cu grades of 1.2 wt% and 0.7 wt%, respectively, is ranked as the third largest economic Ni-Cu deposit in the world after Noril’sk and Sudbury (see Table 1.1, Chap. 1). Ores of the deposit are relatively rich in Cu with an average ratio Ni/Cu = 1.76 (see Table 1.1) and have moderately high PGE concentrations with a total PGE and Au content of around 1 ppm in the sulfide ores (Sun 1986; Yang 1989) and (Pt+Pd)/(Ni+Cu) ratios (PGE in g/t, Ni and Cu in wt%) in the three different ore bodies of 0.04 to 0.45. However, the intrusive rocks that host the sulfide ores are all ultramafic, ranging from dunite to olivine pyroxenite, and, previously, had been thought to have formed from an ultramafic magma with an MgO content of >30 wt% (S.G.U. 1984); this is quite different to the general features of other Cu and PGE rich Ni sulfide deposits.
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- The Jinchuan deposit, China
Professor Anthony J. Naldrett
- Springer Berlin Heidelberg