WHITTLE RECYN CASE_2017

o The Mirah resin plant treats slurry from the CIL plant in a four-stage reactor circuit. The recycle circuit is particularly beneficial due to the high cyanide levels (+1000ppm CN) required to ensure good silver recovery. Since commissioning the resin plant in May 2015, no additional detox has been required to meet compliance levels and an average of 1t/day of NaCN is recycled directly to the leach plant. • A second larger ReCYN™ plant is being constructed at the Mt. Muro project. Laboratory Test work The following table shows typical results from testing a gold plant slurry containing soluble copper. Many ore types have been tested. 2.3.3

Table 3: Typical Results from ReCYN™ Batch Adsorption Tests

SPECIES

Feed Slurry (ppm)

Treated Slurry (ppm)

Au Ag Cu Zn

0.91 0.85

<0.01 <0.01

621

0.75

9.07 10.7

0.1 0.3

Fe

As Cd

0.5

<0.1

0.12

<0.01

Cr

7.8 5.7

<0.005 <0.004 <0.001

Co

Mn Mo

0.15 0.99 0.38

0.27 0.04

Ni

Pb

0.5 0.5

<0.01

Sb

<0.1

CNTotal

1060

0.3

ReCYN™ Case Study – Martabe Operations

16

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