... sections 3 and 4. The total impact of the Rosemont Copper Project over the duration of the production and post-production phases on the economy of Pima County is estimated to be 41,501 person-years ... recycled within the county’s economy. The IMPLAN input-output model was used to estimate multiplier effects. Economic Impacts during the Construction Phase The construction phase will last ... measures the economic impact of the Rosemont Copper Project on employment, labor income, output, gross regional product and tax revenue in Pima County, Arizona, during the project’s construction,...