How do you convert 1 cubic meter of aggregate to metric ton?

This is impossible with the information you provided. You need the specifications of what you are converting. The density of a substance will effect how much it weighs over one cubic meter of area. Simply put, that one metric ton of sand will convert to more cubic meters than lead because it takes less lead to weigh a metric ton than it will take for sand to weigh the same. Re-post what exactly you are trying to convert and you will have more luck getting an answer.