HOUSTON, July 2, 2013 /PRNewswire/ -- Gastar Exploration Ltd. (NYSE MKT: GST) ("Gastar") announced today that it has signed a purchase and sale agreement ("PSA") with an undisclosed third party for the sale of Gastar's interests in approximately 76,000 net acres in Kingfisher and Canadian counties, Oklahoma for approximately $62.0 million in cash. The agreement also provides for the trading of certain acreage between Gastar and the third party to create more concentrated acreage blocks for both parties. The transaction is subject to customary closing conditions and is expect to close in mid-third quarter of 2013. The acres to be sold are part of the undeveloped leases acquired by Gastar on June 7, 2013 in a transaction with Chesapeake Energy that included drilling rights on approximately 157,000 net acres in Oklahoma, along with approximately 2.8 MMBoe of proved developed producing ("PDP") reserves. Gastar also announced that its partner in its original area of mutual interest ("AMI") in Oklahoma has elected to exercise its rights and acquire approximately 12,820 net acres that Gastar acquired from Chesapeake for a total payment of $12.1 million. This purchase includes approximately 400 MBOE representing 50% of the PDP reserves associated with the wells acquired from Chesapeake that are geographically located inside the existing area of mutual interest. After completing the pending transactions, Gastar will continue to own all of the PDP reserves acquired in the Chesapeake transaction outside the existing AMI and 50% of the PDP reserves inside the existing AMI, along with drilling rights on the remaining approximately 70,206 net acres acquired from Chesapeake. Gastar has an additional 59,390 gross acres (24,584 net acres) acquired earlier in the original joint venture as part of a program to develop the Hunton Limestone formation in Oklahoma. Accounting for both transactions, Gastar's total acreage in the Hunton Limestone play will be approximately 136,772 gross (96,684 net) acres.