suggest suitable gold ore for cu zn pb iron ore ore mm
Nov 10, 2009· Fig. 1. Linear regressions between in-use stocks and GDP for Cu (A), Zn (B), Al (C), and Fe (D).The correlations have an R 2 > 0.9 for copper and aluminium, whereas zinc and iron still retain an R 2 > 0.8. The small sample sizes, Fe (n = 7), Al (n = 8), and Zn (n = 6), may be of some concern, yet the correlation appears to hold when more studies are available, Cu (n = 18).