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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.