From the BLMs website;
The public lands provide significant economic benefits to the Nation and to states and counties where these lands are located. Revenues generated from public lands make BLM one of the top revenue-generating agencies in the Federal government. In 2007, for instance, BLM’s onshore mineral leasing activities will generate an estimated $4.5 billion in receipts from royalties, bonuses, and rentals that are collected by the Minerals Management Service. Approximately half of these revenues will be returned to the States where the mineral leasing occurred.
The Bureau administers about 57 million acres of commercial forests and woodlands through the Management of Lands and Resources and the Oregon and California Grant Lands appropriations. Timber receipts (including salvage) are estimated to be $55.4 million in fiscal year 2007, compared to estimated receipts of $33 million in Fiscal Year 2006 and actual receipts of $13.5 million in Fiscal Year 2005.
Click on title above to lean more about the BLM; http://www.blm.gov/wo/st/en/info/About_BLM.html