OKLAHOMA CITY, Dec. 1, 2014 /PRNewswire/ -- American Energy Minerals Holdings, LLC (AEMN), an affiliate of American Energy Partners, LP (AELP), announced today that it has raised $500 million in equity commitments to pursue a business plan focused on the acquisition of minerals and overriding royalty interests (ORRIs) across targeted high-return onshore basins in the U.S. The equity commitment was…