A tonne is a measure of mass. A cubic metre is a measure of volume. The two measure different things and,according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a cubic metre of air. How many tonnes? Next consider a cubic metre of lead. How many tonnes?
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The answer will depend on what metal the ore contains.
Tons and yards are completely different units and cannot be converted.
There is no such thing as a "cubic ton". You can have cubic meters, but not cubic tons.
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A metre is a unit of length. A ton is a unit of mass. The two units of measurement are therefore incompatible.