Characterisation and prediction of acid rock drainage potential in waste rock: Value of integrating quantitative mineralogical and textural measurements

•Measured mineral grades generally confirmed geochemical static test results.•Mineralogy did not explain pH > 7 in humidity cell tests; liberation data were needed.•Mineralogy/texture data enabled sampling error and confidence interval assessment.•Sampling error evaluation for coarse material is key for accurate ARD assessment.•Lack of mineralogy and texture data greatly limits ARD test result interpretation.