"The use of coca leaves in rituals involves the creation of kintus. To form a kintu three perfect coca leaves are taken from a bag of leaves, they are then held at the finger tips of both hands by the stem end, either as a bundle or slightly fanned. If the kintu is to be used by the person who formed it then the leaves are held green (non-veined) side up, if the kintu is to be given to someone else then the green side faces the person to whom they are to be given."
A nice video from The Renegade Health Show goes over the health benefits of Coca and talks about using Coca in ceremony.
It is meeting with the spirit of the element that you are working with, whether it is coca, maize or a mountain. In the case of coca, you meet the mother spirit, soul or power of the plant, which is the sacred part which never dies.