Steel and Impure Gold (S.A.I.G.)

This mod adds 2 new materials: steel and impure gold

Steel is found by mining, it is about as rare as gold

Impure gold is crafted like (G=Gold Ingot, I=Iron Nugget)

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[I] [G] [I]

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Impure gold can be used to upgrade gold armour and tools, using a smithing table [Gold Tool/Armour] + [Impure Gold] > [Impure Gold Tool/Armour]

Additionally you can make Impure gold rods, with the recipe (I=Impure Gold)

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They are used to make the Master's Sword! It is crafted like a sword: (I=Impure Gold Rod S=Steel)

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Source (because it isn't public according to CF): https://github.com/Telekinesis846/s.a.i.g.