In GETEM, the bare erected cost divided by the primary equipment cost is the sum of all the multiplier values, i.e. 1 0.70 0.39 0.25 0.05 0.05 2.44, or 244%. In the genGEO methodology described here, the bare erected cost divided by the primary equipment cost is 1.39 • 1 0.58 0.11 0.00 0.04 2.40, or 240%. Thus, the two models agree to less than 2% of each other. GEOPHIRES does not estimate surface plant costs based on an up-scaling of sub-component costs and therefore cannot be compared.