Stonehenge Energy Resources Sells Midstream Assets to MarkWest Energy Partners for $512 Million

Stonehenge Energy Resources, L.P. (“Stonehenge”) announced today that it, together with its partners in Keystone Midstream Services, LLC (“Keystone”), closed on a transaction with a subsidiary of MarkWest Energy Partners, L.P.

whereby MarkWest has acquired Keystone for a purchase price of $512 million, subject to adjustment for working capital. Stonehenge