Table 1. General descriptors of the tailings samples and the metagenomes analysed in this study.
| Sample | pH | EC (μS/cm) | CEC (cmol+/kg) | TOC (g/kg) | MBC (mg/kg) | Total Cu (mg/kg) | Total Pb (mg/kg) | Total Zn (mg/kg) | Raw metagenome data size (Mb) | Mean GC content after quality control (%) | Total gene copy annotated | Number of contigs after assembly | Maximum contig size (bp) | N50 of the contigs |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tailings_1 | 6.70 | 5,490 | 30.47 | 5.55 | 132.35 | 1316 | 5080 | 3914 | 706 | 63 ± 9 | 2,153,536 | |||
| Tailings_2 | 6.80 | 5,420 | 48.30 | 5.85 | 92.65 | 1294 | 5300 | 3234 | 707 | 62 ± 10 | 1,046,050 | |||
| Tailings_3 | 6.90 | 3,860 | 39.04 | 5.54 | 73.64 | 1285 | 4700 | 2620 | 551 | 60 ± 11 | 1,136,742 | |||
| Tailings_4 | 6.90 | 2,080 | 42.06 | 4.95 | 51.38 | 1247 | 5090 | 3164 | 551 | 64 ± 7 | 1,044,817 | 82,334 | 123,516 | 1,734 |
| Tailings_5 | 6.70 | 3,120 | 15.63 | 4.43 | 38.49 | 1205 | 6350 | 2991 | 544 | 62 ± 9 | 1,115,745 | |||
| Tailings_6 | 6.80 | 3,040 | 12.19 | 3.77 | 28.04 | 1056 | 5860 | 3261 | 542 | 62 ± 9 | 1,265,601 | |||
| Tailings_7 | 6.80 | 3,390 | 20.51 | 3.54 | 27.78 | 1143 | 6140 | 3485 | 611 | 62 ± 9 | 1,130,746 |
Notes: EC, electrical conductivity; CEC, cation exchange capacity; TOC, total organic carbon; MBC, microbial biomass carbon.