The production technical conditions and technical and economic indicators of some major cyanide gold extraction plants abroad are listed in the table below. Among these factories, Pueblo, which processes 7260 tons of ore daily, loves Landsland, which treats ore at 6000t, and Atlanta and Gusberg, which process ore below 500t. In these stirred cyanide plants, due to the nature and structural differences of the ore, the NaCN content in the slurry is between 0.025% and 0.15%, and the NaCN consumption per ton of ore is between 0.5 and 1 kg. The recovery rate of gold is more than 90%, and the highest is 97.2%.
Some foreign cyanide plants
mine Or company | Canada Agnico Iger (AgnicoEagle, 1980) | Ghana Shanti (Ashanti, 1976) | South Africa Lovelands (Elandsrand, 1980) | Delamar, USA (1979) | Colombia Frontino (1975) |
Ore characteristics | Disseminated pyrite pyrrhotite | Gold-bearing quartz sulphide ore | Ore vein | Rhyolite | Quartz vein sulfide |
Mining method | Underground mining | Underground mining | Open pit mining | Underground mining | |
Processing ore ability ∕t·d -1 | 1090 | 3175 | 6000 | 2000 | 600 |
Ore grade ∕ g·t -1 | Au6.52 | Au14.7 | Au5.78 | Au0.7, Ag161 | Au6.5, Ag18 |
Bond work index | twenty one | twenty four | 12.8 | Variety | 12 ± |
Grinding power consumption ∕ kWh·t -1 | 25.1 | 11~23 | 20 | ||
Other power consumption∕ kWh·t -1 | 32.7 | 16.5 | twenty two | ||
Water consumption∕ L·t -1 | 1960 | 2253 | 800 | 355 | |
Stirring cyanide Time ∕h | 48 | 44 | 72 | ||
Mineral slurry Sodium cyanide ∕% | 0.15 | 0.03 | 0.1 | 0.05~0.055 | |
Pulp pH | 11.5 | 11 | 10.5 | ||
Sodium cyanide consumption ∕kg·t -1 | 0.63 | 0.5 | 1.0 | ||
Operating rate ∕% | 90 | 95 | 67.9 | 92 | 75 |
Work efficiency Work class | 267 | 11.7 | 103 | 10.5 | |
Tailings treatment | Discharge into tailings dam | Pumping tailings dam | Self-flowing tailings dam | Into the sedimentation tank, Liquid return | Discharged into the river |
Plant selection Plant structure | Zinc-plated plate structure | RC | Steel frame | Prefabricated steel frame | Steel-wood structure, Galvanized sheet roof |
Total number of employees | 190 | 7759 (including mining) | 135 | ||
Production cost∕ USD·t -1 | 5.62 | 4.33 | 5.40 | 6.40 | 3.2 |
product | Gold ingot | Gold ingot (including silver ) | Gold ingot (including bismuth ) | Qualifying gold | Qualifying gold |
Gold recovery rate ∕% | 91 | 95.2 | Au92, Ag85 | Au85～90, Ag75 |
(continued in the table)
Mine or company | Houston, United States (Houston·1980) | Australia Yatefer (Telfer, 1980) | Dominica Pueblo (1977) | Spain Cerro Colorado (1978) | United States Atlanta (Ailanta, 1980) | Gooseberry, United States (1980) |
Ore characteristics | Metamorphic schist | Quartzite Limonite | Laterite mine | Gold-bearing iron cap | Quartz conglomerate | Gold veins Sulfide |
Mining method | Open pit mining | Open pit mining | Open pit mining | Open pit mining | Open pit mining | Stratified filling |
Processing ore ability ∕t·d -1 | 540~630 | 1500 | 7260 | 4800 | 450 | 317 |
Ore grade ∕g·t -1 | Au2.7, Ag1.03 | Au6.2 to 9.3 | Au4.48, Ag20.57 | Au2.4, Ag44 | Au3.4, Ag58.3 | Au6.5, Ag257 |
Bond index | 9.5 | 9.9 | 8.95 | 15 | 9.15 | |
Grinding power consumption kWh·t -1 | 7.4 | 5.94 | 14.75 | 29.75 | 28.5 | |
Other power consumption∕ kWh·t -1 | 20.3 | 10.16 | 11.8 | 31.2 | 24.8 | |
Water Consumption ∕L·t -1 | 1000 | 3050 (including return water) | 750 | 1040 | 997 | |
Stirring cyanide Time ∕h | 48 | twenty one | 16 | twenty one | twenty four | 48 |
Mineral slurry Sodium cyanide ∕% | 0.04 | 0.12 | 0.025 | 0.08 | 0.15 | |
Pulp pH | 10.5 | 12.1 | 12.5 | 11.6 | ||
Sodium cyanide Consumption ∕ Kg·t -1 | 0.3 | 0.66 | 0.6 | 0.73 | 0.678 | |
Operating rate ∕% | 95 | 92 | 73 | 95 | 91 | 94 |
Work efficiency Work class | 12 | 166 | 55 (including mining) | twenty three | 22.7 | |
Tailings treatment | Self inflow Tailings dam | Pump delivery Tailings dam | Dump into tailings dam | Tailings dam | Tailings dam | Within the fence |
Plant structure | Prefab Reinforced dam | Steel structure, Corrugated galvanized sheet roof | Steel asbestos tile, leaching Concentrated in the open air | Steel-wood structure | Steel structure | |
Total number of employees | 49 | 36 | 750 | 75 | 40 | 98 |
Production cost∕ USD·t -1 | 7.2 | 2.8 | 17 | |||
product | Gold and silver deposit | Gold ingot (including silver) | Qualifying gold | Qualifying gold | Gold and silver deposit | |
Gold recovery rate ∕% | 98 | Au91.57, Ag77.3 | Au90, Ag30 | Au81, Ag26 | Au97.2, Ag95.8 (cyanide) |
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