Acid and Metalliferous Drainage (AMD) is a critical environmental problem worldwide. It occurs when sulfide minerals, primarily
pyrite, oxidise chemically or biologically to produce acidic wastewater containing elevated concentrations of sulfate and toxic
elements. This short paper presents a very brief and general introduction of AMD, with a specific focus on two categories of AMD
remediation options including source- and migration-control. Some most recent examples of potentially viable and economically
sustainable surface passivation strategies for AMD control at-source are briefly discussed in this review.