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Table 5 Tailings characteristics linked to ARD generation potential

From: Characterization and assessment of potential environmental risk of tailings stored in seven impoundments in the Aries river basin, Western Romania

Impoundment

pH of leachate

S

NPa

APPb

NNPc

ARD generation potential

  

kg t-1

kg CaCO3 t-1

kg CaCO3 t-1

kg CaCO3 t-1

 

Sartas

2.7

8.5

0.0

26.6

−26.6

certain

Cutii

2.6

6.9

0.6

21.6

−21.0

certain

Saliste

2.9

0.7

0.0

2.2

−2.2

uncertain

Gura Rosiei

3.5

0.8

1.25

2.3

−1.1

uncertain

Sesei

8.2

0.5

12.0

1.6

10.4

uncertain

Stefanca

10.5

0.6

18.7

1.9

16.9

uncertain

Brazesti

8.1

1.6

102

5.0

97.0

no

  1. aNP - neutralization potential expressed as kg CaCO3 t-1 tailings; bAPP - acid producing potential expressed in calcite consumed for neutralization (kg CaCO3 t-1) at pH > 6.3; cNNP - net neutralization potential calculated as the difference NP-APP.