Headquartered in Westminster, CO and backed by Energy Spectrum Capital, Stonehenge Energy Resources is a private energy company focused on building, owning and operating midstream facilities in the Appalachian basin to support its producer-partners in the optimum development of their resources. Formed in 2007, Stonehenge supported the early Appalachian unconventional shale gas development by gathering and processing NGL-rich gas in Butler County, Pennsylvania. Stonehenge currently operates two natural gas gathering systems in Butler, Clarion and Armstrong Counties, Pennsylvania.