Table 1.

Chemical compositions (wt.%) of oxides and elements obtained by XRF analysis of the original gold ore (before incubation) and the solid residue (after incubation).

Sample type	Bacterial strain	Chemical compositions of oxides and elements, wt.%
		SiO2	SO3	Pb	Al2O3	Fe2O3	CaO	K2O	ZnO	Au	MgO	Ag	Cr2O3	LOI
Original ore sample before the microbial treatment	—	78.6	4.57	3.37	3.47	3.12	2.92	1.64	0.82	0.26	0.24	0.20	0.16	0.61
Ore samples (solid residue) after the microbial treatment with each bacterial strain	a-1	85.6	4.07	2.3	2.15	1.97	1.49	1.07	0.49	0.00	0.16	0.14	0.24	0.32
	a-2	82.6	2.82	3.43	2.63	2.58	2.75	1.38	0.80	0.12	0.25	0.14	0.20	0.32
	e-1	83.1	4.63	3.00	2.18	2.35	2.09	1.17	0.66	0.10	0.15	0.13	0.15	0.29
	e-2	82.8	5.07	2.58	2.35	2.36	2.28	1.30	0.63	0.00	0.16	0.13	0.11	0.23
	f-1	83.8	5.03	3.00	2.09	1.82	1.48	1.23	0.56	0.00	0.13	0.17	0.33	0.36
	f-2	79.1	6.23	3.30	2.50	2.90	2.31	1.56	0.90	0.18	0.23	0.00	0.27	0.40
	j-1	85.3	5.05	2.4	1.97	1.46	1.62	1.09	0.38	0.03	0.13	0.09	0.24	0.24
	j-2	83.7	4.40	2.73	2.07	2.54	1.70	1.09	0.62	0.04	0.16	0.13	0.21	0.61
	NC*	83.1	4.82	2.78	2.29	1.98	2.27	1.13	0.49	0.26	0.15	0.12	0.21	0.38

The Au content of the original ore sample used in this study was 0.26 wt.%. ^*NC: Negative Control.