Technical and economic indicators of stirring cyanide

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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