"Drilling Candidate Site 'Bonanza King' on Mars.    This image from the Mast Camera (Mastcam) on NASA's Curiosity Mars rover shows a portion of the pale rock outcrop that includes the ""Bonanza King"" target chosen for evaluation as the mission's fourth rock-drilling site. Raised ridges on the flat rocks -- possible mineral veins -- are visible at upper and middle right. Tread marks from one of Curiosity's wheels are visible in the lower half of the image from Sol 707, Aug. 12, 2014.  Credit: NASA/JPL-Caltech/MSSS"