National Heritage Area Authorizations Extension Act of 2012 - Extends through FY2016 the authority of the Secretary of the Interior to make grants or provide assistance for the: (1) National Coal Heritage Area (West Virginia), (2) Tennessee Civil War Heritage Area, (3) Augusta Canal National Heritage Area (Georgia), (4) Rivers of Steel National Heritage Area (Pennsylvania), (5) Essex National Heritage Area (Massachusetts), (6) South Carolina National Heritage Corridor, (7) America's Agricultural Heritage Partnership (Iowa), (8) Ohio & Erie Canal National Heritage Corridor, and (9) Hudson River Valley National Heritage Area (New York).
Amends the Lackawanna Valley National Heritage Area Act of 2000 to extend through FY2016 the authority of the Secretary to provide grants or other assistance for the Lackawanna Valley National Heritage Area in Pennsylvania.
Amends the Delaware and Lehigh Navigation Canal Heritage Corridor Act of 1988 to extend through FY2016 the authorization of appropriations for the management action plan respecting the Delaware and Lehigh National Heritage Corridor in Pennsylvania.
Extends the John H. Chafee Blackstone River Valley National Heritage Corridor Commission (Massachusetts and Rhode Island) through FY2016.