At approx 10:30 AM EE was operating Cat D8R dozer. EE proceeded to dismount the equipment to visually examine work area. EE's foot was caught between blade rise & machine tracks while simultaneously slipping on the wet & muddy tracks. This caused EE's left ankle to twist & then caused EE to fall onto tracks. EE called Pit Foreman at 10:47 AM & notified Foreman