Here's a down view of the shaft in the crypt that would raise up the Mummy, his chariot and his clay horses up and out of the crypt, but without the weighted pulleys that we would insert later.
By we I mean myself as the Illustrator and Nigel Phelps as the Production Designer overseeing the design of the picture.
Here's a tighter drawing done in Photoshop, pulleys in place.
I've posted this one before. If not who cares?
Lastly, the carriage and horses on the platform, raised to the surface.