This pack makes copper slightly more useful by using it to craft powered rails, crafters, and hoppers.

• Hoppers are crafted with 2 copper ingots and 3 iron ingots
  
• Powered Rails use copper ingots instead of gold ingots
  
• Crafters are crafted with copper ingots instead of iron ingots
  

This pack is designed to be compatible with Advanced Recycling by blocking the smelting recipe for powered rails to gold nuggets

Check out Coding's Crafting Tweaks collection for more crafting changes