Acid-base accounting (ABA), also called static testing, calculates a net neutralisation potential (NNP) representing the ability of a body of rock to produce acid rock drainage or to consume free acid and neutralise it. Methods for determining the NNP have been proposed by multiple research groups and some have been selected by government organisations to be part of mine development reporting requirements. The method required in a particular jurisdiction varies and this information should be obtained from the relevant government organisations. ALS offers a wide range of methods for ABA estimation, including: Sobek, Modified Sobek, Siderite correction, Modified Neutralisation Potential from MEND, and EN 15875 methods.
ALS provides a variety of methods to suit the requirements of various jurisdictions.
The table below outlines the parameters included in each of our ABA packages.
|Net Neutralisation Potential (NNP)||√||√||√||√||√|
|Maximum Potential Acidity (MPA)||√||√||√||√||√|
|Neutralisation Potential (NP) & Fizz||√||√||√||√||√|
|Ratio (NP : MPA)||√||√||√||√||√|
|Neutralisation Potential (EN 15875 NP)||√|
|Acid Potential (EN 15875 AP)||√|
|Maximum Acid Potential (EN 15875 AP Max)||√**|
|Neutralisation Potential Ratio (EN 15875 NPR)||√|
|Net Neutralisation Potential (EN 15875 NNP)||√|
|Sulphate by ICP||√|
|Total Sulphate (Carbonate Leach)||√||√|
|Inorganic Carbon (CO2)||√||√|
|Inorganic Carbon (calculated)||√|