Western Canada's largest Carolina TU (Carolin) gold ore, metal hard sandstone deposit account hydrothermal type lens, gold occurs in the form of fine particles dispersed pyrrhotite, pyrite, and other sulphide minerals are arsenopyrite .
Because the mining area is located in the high mountain area of ​​Cascade Mountain at 850m above sea level, the terrain is steep and the work site is lacking. The ore produced is coarsely crushed (-600mm) and broken by two open-circuit crushing systems located underground. after -100 mm) and finely divided (-25mm), the belt conveyor from a downhole ore beneficiation plant transported across the grooves of each of the fine ore bin.
The fine ore bin ore is discharged to the belt by the trough feeder, and then quantitatively supplied to the 2.9m×3.7m Dominion rod mill and 90mm rod mill by a variable speed belt equipped with a measuring sensor, and then sent. Into a 3.2m × 3.7m Domino ball mill grinding to 66% -0.074mm (200 mesh). Since some of the gold particles are separated from each other during grinding, a re-selection device such as a jig and a shaker is inserted into the grinding circuit to recover the dissociated monomer gold particles.
After milling the slurry, adjusted to pH 8.7, addition of copper sulfate, 150g / t, potassium amyl xanthate t, No. 150g / 31 air flotation agent 4.5g / t and turpentine 36g / t, in four floating 8.5m 3 The flotation was carried out in the machine, the concentrate production rate was 6% of the feed, and the recovery rate of gold in the concentrate was 91%. The tailings slurry is then sweeped in four 8.5m 3 flotation machines, and the produced concentrates can recover about 50% of the residual gold. The mine processes 1,500 tons of ore per day, and can produce 100t of concentrate containing 55.99g∕t of gold. The daily output of gold is 5.44~6.22kg. Soon, the ore processing capacity will increase to 2400t / d, the daily gold production 9.33kg.
After the concentrate ore slurry is concentrated in a cyclone to remove excess water, the lime is ground in a 2.1×1.8m ball mill to 98% -0.043mm (325 mesh), then cyanide is added to the reaction tank and stirred under air. Cyanide for 72h. The consumption of the medicament was 0.58 kg of sodium cyanide and 1.2 kg/t of lime.
The concentrated slurry was washed with cyanide leaching solution and washings were mixed frame type clarifiers pump remove particulates and suspended solids, and then by degassing tower after the gas addition, the use of Merrill Kelaofajia zinc powder cementation of gold and lead nitrate . The separation of the zinc-gold precipitate in the replacement lean liquid uses two Perrin filter presses. After the zinc-gold precipitate is air-dried, it is smelted into a combined gold ingot by adding a flux in a single crucible furnace.
The total recovery of gold during the entire operation was 83%.
The cyanide waste liquid of the plant is treated by introducing chlorine gas into the alkaline waste liquid to decompose cyanide. The solution is filtered through two 1.8×1.8m pad glass fiber to remove solids, and then the remaining carbon is removed through the carbon column. Chlorine and other harmful ions. In addition to not polluting the environment, this method can also recover some gold that has not been precipitated by zinc substitution by carbon column adsorption.
The tailings and cyanide tailings were pumped and pumped to the tailings dam by a pressure of 2775.88 kPa (400 psi) through a 183 m long, 150 mm diameter pipe. The water oozing from the tailings dam flows into the pool in a trickle. The pump on the barge in the pool draws clarified water into the upper pool and from there back to the concentrator.
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