Application of Response Surface Methodology (RSM) for Simultaneous Optimization of Kinetic Parameters Affecting Gold Leaching in Thiosulfate Based Media: A Statistical Approach

Table 7

Kinetic parameters for gold leaching in 0.5 mol. L⁻¹ S₂O₃²⁻ and 3 mol. L⁻¹ NH₃ solution at 35°C and varied copper [Cu] concentrations.

[Cu] (mol. L^−1)	Surface chemical reaction control		Diffusion control
	kc (s^−1)	R^2	kd (s^−1)	R^2
0.001	5.08 × 10^−5	1	6.41 × 10^−5	0.998
0.002	5.08 × 10^−5	0.999	6.87 × 10^−5	0.97
0.003	5.38 × 10^−5	0.997	7.29 × 10^−5	0.993