Assessing the economic feasibility and market potential is important for making decisions on landfill mining projects. A cost-benefit analysis model of landfill mining was applied and the market potential was assessed based on the field study. Among all of the costs and benefits of landfill mining, the greatest cost was that of rental excavation and hauling equipment, followed by the waste processing cost and the cost of material transportation; while the benefit of generating electricity by incinerating combustibles ranked first, followed by the benefit of land reclamation and then the benefit of recycling soil-like materials. Landfill mining will be cost-benefit effective considering the external and internal benefits, and the NPV was sensitive to the mode of land reclamation, the approach of energy recovery and the possibility of obtaining the benefits of avoiding post closure care.