Curiosity rover was back to work on Sols 4539-4540 after a productive weekend plan.The plan included an APXS analysis on the target 'Jeffrey Pine' and imaging of 'Canyon Oak' with MAHLI.Curiosity performed a DAN passive analysis, ChemCam 5-spot analysis on 'Canyon Oak', and documented 'Santiago Peak'.The day ended with a drive of about 30 meters, followed by untargeted and environmental monitoring activities.