This mod changes the mining of iron and copper. You will have to build bigger and more clever setups to get the iron/copper plates you are used to.
Be aware that mining iron fields will not only return iron-ore but also dirt, gravel and iron-nuggets. The same goes for copper.
Use the newly introduced machines (Crusher, Pulverizer) to get the best out of the ore you are mining. Use Inscinerators to get rid of items that you will accumulate and never use.