Table 2.

Spearman correlation matrix for select parameters and elements, for heavy mineral concentrates (n = 12)

Alkalinity (ppm CaCO3)Conductivity (uS/cm)pHAg (ppb)As (ppm)Cd (ppm)Cu (ppm)Hg (ppb)Pb (ppm)Sb (ppm)Se (ppm)Zn (ppm)Al (%)Ca (%)Fe (%)Mg (%)P (%)S (%)
Alkalinity (ppm CaCO3)1
Conductivity (uS/cm)0.851
pH0.480.21
Ag (ppb)0.780.580.381
As (ppm)0.890.630.240.591
Cd (ppm)0.580.240.460.760.41
Cu (ppm)0.950.750.290.550.870.321
Hg (ppb)0.770.540.450.950.480.840.481
Pb (ppm)0.730.330.610.810.510.920.430.841
Sb (ppm)0.930.850.290.750.840.440.910.690.591
Se (ppm)0.850.790.180.470.790.0330.790.360.220.791
Zn (ppm)0.032−0.20.40.30.090.8−0.0780.390.68−0.06−0.351
Al (%)0.230.083−0.015−0.0390.45−0.320.32−0.17−0.120.20.59−0.331
Ca (%)−0.21−0.45−0.21−0.210.3−0.03−0.041−0.26−0.088−0.17−0.130.190.351
Fe (%)−0.054−0.044−0.34−0.370.19−0.42−0.052−0.37−0.37−0.0520.26−0.370.340.491
Mg (%)−0.67−0.76−0.34−0.39−0.14−0.2−0.42−0.43−0.29−0.53−0.460.130.270.870.261
P (%)0.470.57−0.0990.0930.62−0.210.50.0055−0.170.430.81−0.430.570.170.62−0.171
S (%)0.530.480.210.170.13−0.250.460.12−0.0220.50.47−0.620.028−0.520.0087−0.610.181

Bold values indicated correlation coefficients >0.5 or <−0.5. Positive numbers indicate positive correlations; negative numbers indicate negative correlations.