• Maintains interests in over 200,000 gross acres in western Oklahoma.
   
• Oxbow project of Roger Mills County, Oklahoma: Have budgeted with Cordillera Energy Partners (CEP) as operator to drill 20 to 30 wells over the next 12 months.
   
• Indian project of Roger Mills County, Oklahoma: Seven horizontal wells planned over next 12 months with CEP as operator.
   
• Other Oklahoma and Texas Panhandle projects: Actively acquiring leases for horizontal development of several formations.
   
• Eagle Ford project: Actively leasing in the oil window of the Eagle Ford shale play of southeast Texas.

Anadarko Basin – 1960’s through 1980’s:    
Beginning in the 1960’s, through the 1970’s and 1980’s, Robert A. Hefner III and GHK were best known for pioneering deep, high pressure natural gas development in the Anadarko basin of Western Oklahoma and the Texas Panhandle, where Hefner and the company literally opened up the basin and led the industry in technological innovation to successfully drill and produce many of the world’s deepest and highest pressure wells. GHK also successfully organized and executed large joint ventures with independent and major oil and gas companies. GHK was directly responsible for major advancements in natural gas drilling, completion and production technology and set numerous technological and mechanical world records and industry “firsts.” GHK’s #1 Green well, completed in 1969, was drilled to 24,453 feet, then the second deepest in the world and recorded the world’s then highest surface pressure of 15,130 psi. Also, the #1 Green had the world’s first 20,000 psi wellhead, a world record string of 2 7/8 inch specially designed pipe, and the longest continuous 5 ½ inch casing string ever run in the earth – 24,147 feet that retains the world record to date. From 1972 through 1974, GHK initiated, engineered and participated in the western world’s two deepest wells: The #1-27 Bertha Rogers well (31,441 feet total depth) and the #1-28 E.R. Baden well (30,050 feet total depth). From the 1960’s through the 1980’s GHK drilled and operated 137 wells, without a blowout, in the deep and high pressure Anadarko Basin.

Potato Hills
In the late 1980’s, GHK, believing that the Ouachita overthrust province of eastern Oklahoma held large undeveloped reserves, began a detailed geological and geophysical analysis of the geologically and geophysically complex fold and thrust belt. The analysis included earth satellite, surface and subsurface geological studies and integrated 2-D regional and local seismic. The analysis proved correct when, in 1997, GHK drilled a rank wildcat well, the #1-33 Ratcliff that became the discovery well for the Potato Hills natural gas field. The Potato Hills field is located on a large structural element known as the Potato Hills anticlinorium and, at the time, was one of the larger onshore natural gas discoveries in North America in recent decades. GHK was the sole developer of the field, where the company drilled 53 wells with an average producing depth of 5,200 feet. The daily natural gas production from the Potato Hills field was in excess of 140 million cubic feet per day in 2000, and at that time, the Potato Hills field included seven of the top ten producing gas wells in the state of Oklahoma. In February 2010 GHK sold its Potato Hills asset to Lime Rock Resources.

Anadarko Basin – Indian project:
In 2003 GHK returned to the Anadarko Basin and acquired 50,000 gross acres in an area of about 75 square miles in Roger Mills County, Oklahoma. Primary objectives were the Morrow/Springer and Hunton reservoirs. First natural gas sales in the new Indian Field commenced in late 2004 after construction of the Wildhorse Gas Gathering System. GHK drilled and completed 26 wells in the Indian Field, establishing production in 10 reservoirs between 8,500 and 22,500 feet: Tonkawa, Cottage Grove, Marmaton, Prue, Skinner, Red Fork, Atoka, Lower Morrow, Springer, and Hunton. GHK bought 257 square miles of 3D seismic in the area. In May 2010 GHK sold 70% of its interest in the Indian Field to Cordillera Energy Partners (CEP), retaining an undivided 30% interest. CEP and GHK plan to drill at least seven horizontal wells over the next 12 months.

Anadarko Basin – Oxbow project:
In late 2007, believing that  horizontal drilling and completion technology could unlock large commercial development of Anadarko Basin oil and gas reserves, previously only partially drained by vertical wells, GHK performed a detailed geologic analysis of the Tonkawa formation in Western Oklahoma. GHK initiated its Oxbow project in 2008, initially acquiring about 100,000 gross acres, and began a drilling program to test the commerciality of the concept. Seven successful horizontal producing wells were drilled that proved the economic feasibility of the horizontal play. In October 2009, GHK sold to Cordillera Energy Partners (CEP) 100% of the seven wells and 60% of its interest in the undeveloped acreage, retaining a 40% interest. The CEP-GHK joint venture has planned a 28 well development program for 2010 and 2011. GHK is also a partner in a gas gathering system that services the Oxbow area – Roger Mills Gas Gathering LLC. Since the beginning of 2010, approximately 90 wells have been announced in the area.