Supplemental information may also be obtained by petrographic study of pyrite morphology. Results of leachate analyses are plotted as a function of time resulting in data on rate of reaction and the quantity of acidity or alkalinity produced. Materials containing a large net neutralization potential do not require further analyses. If total pyrite exceeds about 1 percent or if the neutralization potential is small, Caruccio recommends leaching tests to more accurately predict drainage quality. Leaching of overburden constituents other than acidity and alkalinity can be evaluated.
Analysis is expensive.
Long-term predictive capability of leaching tests are uncertain. Tell us what you think.