Such ores containing gold in addition, also contains copper, lead, zinc, tungsten, antimony and other metal minerals, but still has value as a gold ore mined separately. Features such as ores: sulfide occupy a considerable amount (10-20%); natural pyrite and gold in close symbiosis, and most of the copper and lead minerals closely associated; gold wide particle size range, and in the ore uneven distribution. In general, the ore is treated with a complicated process, and the process is adjusted as the ore properties change. The process of mixed flotation-separation flotation can generally be used. When there is coarse gold, the mercury can be mixed (or re-selected) before flotation.
Gold ores belonging to a plurality of gold-bearing sulfide ore type quartz veins. The ore contains 0.1% copper, 0.4-0.5% lead, 4~7% iron, 10-20g/ton gold, 30-50g/ton silver . The total content of sulfide minerals is as high as 10 to 15%. Most of the natural gold is embedded in quartz, and some gold is symbiotic with sulfide. The mine uses a combined mercury-flotation process (see figure below). The coarse-grain unit gold is recovered in the amalgamation operation, and the gold co-existing with the sulfide is selected by flotation to concentrates of copper, lead and iron sulfide. The factory's production indicators are shown in the table below.
Production indicator | ||||||||||
　 | Gold lead concentrate | Gold and copper concentrate | Sulfur concentrate | Mercury paste | Raw ore% | Tailings% | ||||
grade% | Recovery rate% | grade% | Recovery rate % | grade% | Recovery rate % | grade% | Recovery rate % | |||
gold | 9 0～100 (g / ton) | 1 4~18 | 20 0 to 500 (g / ton) | 1 2 to 13 | 10 0-20 (g / ton) | 1 1 to 15 | 1 0 ~ 15 (g / ton) | 4 0～45 | 10 0-20 (g / ton) | 1 to 0.8 (g / ton) |
copper | 1 to 2 | 　 | 1 2 to 15 | 3 0~40 | 2 to 3 | 　 | 　 | 　 | 0.1 | 0.0 8～0.02 |
lead | 2 0～23 | 6 0～70 | 8~10 | 　 | 5~9 | 　 | 　 | 　 | 0.5 | 0.02 |
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