Bronze is an item in Industrial craft that comes in the form of Bronze dust and Bronze Ingot. This is commonly made by the combination of tin and copper ores or dusts. Bronze ore cannot be found in the ground as it is a man-made alloy. For this to be made it must firstly go through a Macerator and then a furnace.
It can also be created in Rotary Macerator by placing Copper Ore in the top left slot and Tin Ore in the top right slot. The Macerator will create 2 Bronze Dust and use one Copper Ore each go-around, using one Tin ore every third, as per the recipe. If you pull the Tin ore out early, it will 'eat' one of the ores.
The Bronze Dust can then be smelted into Bronze Ingots.
Bronze also is used to craft the important Wrench (IndustrialCraft), which is used for dismantling machines.
Note: Bronze could previously be crafted with Ingots, but as Forestry was removed, this is no longer possible.