Hart Van Denburg/CPR News Jefferson County Open Space could get nearly 1,200 acres of the Goltra ranch properties, which sit between Clear Creek Canyon Park, Centennial Cone Park and Mount Galbraith Park through a complex deal involving the mining company Martin Marietta. Jefferson County officials have had their eyes on the foothills west of Golden for decades. A sprawling set of ranch properties sits just beyond the city limits, with miles of hilly and largely untouched terrain. Now, the county is poised to buy a large chunk of that land through a complex deal involving the mining company Martin Marietta. Ultimately, Jefferson County Open Space could get nearly 1,200 acres of the Goltra ranch properties, which sit between Clear Creek Canyon Park, Centennial Cone Park and Mount Galbraith Park.