July 14, 2014
On July 11 Department of Interior issued a report on economic impact of public lands for FY 2013. The report addresses recreation, conservation, water, fossil fuels, renewable energy, non-fuel minerals, restoration, forage, grazing, and timber.
"In FY 2013, Interior’s lands hosted an estimated 407 million visits. The net economic value of a visit to Interior lands varies depending on the activity. For FY 2013, value added provided by visitation to Interior sites was estimated to be $25 billion, economic output was estimated to be $41 billion and about 355,000 jobs were supported. "
Here is the link to the Executive Summary.