Long-term iron-ore prices will be 30-40% higher than average industry forecasts of $75/t, largely due to depletion of existing iron-ore deposits. Three forecasting methods were used: marginal costs, global marginal incentive price, and big three marginal incentive price. All concluded prices will be $102-105/t by 2020, 30-40% above consensus. Depletion means new projects must supply 310Mt in 10 years to sustain production, but consensus forecasts do not account for this. Higher long-term prices are needed to incentivize the large investments required for new projects.