G.M. Oil Properties Inc. has retained Energy Spectrum Advisors Inc. to sell certain leasehold in Oklahoma. The package includes 41% average working interest (33% average net revenue interest) in proved developed locations and 56% average working interest (45% average net revenue interest) in proved undeveloped locations on approximately 22,000 gross acres in McIntosh, Pittsburg and Haskell counties. Production is up to 4.5 million cubic feet of gas per day (up to 1.7 million net). Total net reserves are 42 billion cubic feet (20% proved developed). The assets also include interest in two pipelines that transport gas from areas near Lake Eufaula. For more information, contact Damian S. Wells, 214-987-6127.