Question is simple - How to empty Resource Barrels?
When refining materials it yields different amounts of elements, ofcourse the most useful elements gets the lowest yield amount. After a while you get piles of barrels filled with some elements which are useles in such huge amounts. How can i empty a Barrel without using its content for creating or synthesizing as those barrels just pile up like garbage.
Tanks are only a temporary solution. For example: While filling 1 barrel of Iron, it fills aprox. 2-3 barrels of silicon, silicon is being barely used for building when iron is a massive requirement for almost everything.

Would be great if Refinery had an option to select which element to process in to a barrel and which should be destroyed. Or if it could simply destroy the element of which the output barrel is full instead of stopping the whole process and waiting for space being freed for that element.