The mammoth impales a few people. Not much gore.
A man pulls over off a highway in his car and gets out for a minute, then the mammoth shows up and impales the man. There's no blood, but it is intense.
The mammoth stabs the main character in his side, however it is dark and no blood is scene. In the next scene, when they're bandaging the wound, blood is seen.
The mammoth stomps on a man and crushes him. No blood is seen, but a loud CRUNCH noise is heard.
A man is impaled by the mammoth outside of a gas station, some blood is shown dripping out of his mouth. Then, the mammoth lifts his head and impales the man onto it's other tusk.
A helicopter circles the mammoth and shoots at it. No blood is seen, but the helicopter crashes a few moments later, and that part is quite violent.
The movie is very mild as far as gore and blood. There is a fair amount of violence.