Denver-based Cimarex Energy Co. (NYSE: XEC) has entered into an agreement to sell certain properties in Ward County, Texas, to Natchez, Mississippi-based Callon Petroleum (NYSE: CPE). The purchase price is $570 million in cash. The properties produce about 6,831 barrels of oil per day (73 percent oil), mostly from the Bone Spring formation. "The sale of the Ward County assets is part of our continuous portfolio optimization and high-grading of our investment opportunities," said Tom Jorden,…