Currently, there is no consensus on which method most accurately reflects field conditions. Questions have also arisen regarding length of laboratory test time and extrapolation to field weathering time. It has been observed that pyrites of different origins can exhibit varying levels of reactivity. The basic premise is that lower temperature decomposition reflects unstable and more reactive pyrite. The goal of these research efforts is to identify the controlling factors and develop a reproducible test that discriminates reactive and nonreactive pyrites.
Computer models are another approach to prediction of acid generation.
Many of these parameters are difficult to measure or must be estimated and verification is generally lacking. One combined variable estimates acid generation and a second variable accounts for leaching of weathering products. This model is still undergoing testing and verification. The benefits of lime and other alkaline agents have long been recognized in mitigating acid drainage. However, the complex chemistry of spoil materials have given varying levels of effectiveness in alkaline addition studies.