Tandem hopper
A buffer for input and output

 
Transport of raw materials across the factory area is mainly done with conveyer belts. The hoppers are used for input or output. In Helpful hopper (Photos 2022-2) sand or gravel is put on a conveyer belt from the hopper, in the photo below happens the opposite, the buffered product is expelled to trucks.

 
 
 
 
This is a reedited version of one of the photos in Remix plant (Photos 2020-2). These colors don't match reality.

Artificial coloring and Improved reality® by Billy Axeman.