Stockpiling ore in the port is not a great idea as you have to pay exorbitant storage fees. It is better to coordinate your loading so once you know you have a ship on the way you truck it in with the least wait. Plus which this is Mexico, and it is always better to keep everything, even thousands of tons of raw ore within your own field of vision, so to speak.
The logic is simple, keep accumulating on your own land where you don't have to pay rent or hire extra security. As it gets closer to the time to ship, you start trucking. I doubt it will be too long before that happens.
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