It's almost impossible to survive without items made of metal. Guns, clothes, and lots of other things require various metal parts. You will have to go deep into the mines to get some ore and then melt it into ingots. 

Ore
blobid0.png Copper ore Can be smelted into a copper ingot
blobid1.png Tin ore Can be melted into a bronze ingot.
blobid2.png Iron ore Can be smelted into an iron ingot.
blobid3.png Chromite ore Used for the smelting of steel ingot.
blobid4.png Nickel ore Used for the smelting of high-end weapon alloy ingots.
Tungsten ore  Used for tungsten production 
Ingot
blobid5.png Copper ingot Produced in the foundry from copper ore.
blobid6.png Bronze ingot You get bronze by smelting tin and copper in the right proportions
blobid7.png Iron ingot Produced in the foundry from iron ore. Steel is stronger than iron
blobid8.png Steel ingot Produced in the improved foundry from an ore blend
blobid9.png Weapon alloy ingot Suitable for creating a perfect weapon, and the best walls
Tungsten ingot Very strong and hard metal. Used for making high-quality parts
Plate
blobid10.png Copper plate A required part for making weapons
blobid11.png Bronze plate A required part for making weapons
blobid12.png Iron plate Elegant plate made from an iron ingot on a workbench
blobid13.png Steel plate Made from steel ingots at the workbench. Adds protection against bites, gunshots, and punches.
blobid14.png Alloy plate A required part for making weapons
Tungsten plate Manufactured from a tungsten ingot in a Foundry
Fasteners
Copper fasteners Multipurpose kit of fasteners for crafting and building
Bronze fasteners Multipurpose kit of fasteners for crafting and building
Iron fasteners A necessary component for crafting of many items. You can't build a house, a stable, or a barn without it.
Steel fasteners Used for building and shoemaking
Nickel-plated fasteners Used for building and shoemaking
Tungsten fasteners Exceptionally strong and durable fasteners
Parts
blobid20.png Copper parts Components needed for making primitive firearms.
blobid21.png Bronze parts Components needed for making simple firearms
blobid22.png Iron parts Components needed for making quality firearms
blobid23.png Steel parts Components needed for making durable firearms
blobid24.png Nickel-plated parts Components needed for making powerful firearms
Tungsten gunparts Components needed for making high-quality powerful firearms
Tools
blobid25.png Copper tools Copper tools are required for making and upgrading workshops
blobid26.png Bronze tools For making and upgrading workshops
blobid27.png Iron tools Iron tools are required for making and upgrading workshops
blobid28.png Steel tools Steel tools are required for making and upgrading workshops
blobid29.png Nickel-plated tools Alloy tools are required for making and upgrading workshops
Tungsten tools High-strength tungsteen tools. Required for building and upgrading workshops