Found this site whilst surfing the Net earlier. It has an excellent pictorial of how aggregate is mined then brought to the rail heads for loading onto aggregate hoppers. The whole process is explained.
This may help out someone whom is modelling this sort of industry as it explains in pictures the whole process from start to finish.
May be of use to someone :thumbsup:
http://www.lafarge.co.uk/pdf/A_Guide_to_Mountsorrel_Quarry.pdf (http://www.lafarge.co.uk/pdf/A_Guide_to_Mountsorrel_Quarry.pdf)
Brilliant link, I've got a stone crushing plant on Claywell and now know how it is supposed to work, a big thank you. :thumbsup: