On December 6, 2012, the United States Small Business Administration (SBA) published a proposed rule to increase the small business size standards for three of the four industries in North American Industry Classification System (NAICS) Subsector 213, Support Activities for Mining, that are based on average annual receipts. As part of its ongoing comprehensive size standards review, SBA evaluated the four receipts based standards in NAICS Subsector 213 under NAICS Sector 21, Mining, Quarrying, and Oil and Gas Extraction, to determine whether the current size standards should be retained or revised. Within NAICS Sector 21, only NAICS Subsector 213 has receipts based size standards. Note the title of this rule was changed from "Small Business Size Standards: Mining, Quarrying, and Oil and Gas Extraction". This title was based on the one for Sector 21 of the Small Business Size Standards by NAICS Industry. However, SBA later concluded that this title was a misnomer since this rule only covers the four revenue-based size standards under Subsector 213, Support Activities for Mining and not the entire Sector 21. The rest of the industries in that Sector have employee based size standards which SBA will review in the near future with other employee based size standards. In developing the proposed size standards, SBA applied its "Size Standards Methodology," which is available on the Agency's website at http://www.sba.gov/size. SBA expects to publish the final rule in the near future.