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Wikipedia article

This article is about an older version of DF.

Tetrahedrite is an incredibly common ore of both copper and silver. Smelting tetrahedrite will produce 4 copper bars and 0-4 silver bars (with a 20% chance of each silver bar being produced). On average, each nugget of tetrahedrite will produce less than one bar of silver when smelted.

Tetrahedrite can also be used in alloy reactions requiring either a copper-bearing ore or a silver-bearing ore, but will only be used as a silver ore if no other silver ores are available. Two tetrahedrite nuggets can be smelted together as a copper-bearing ore and a silver-bearing ore to make eight billon bars for a roughly 70% increase in value compared to smelting the nuggets independently.

When using Tetrahedrite as a copper-bearing ore, it's often best to smelt it into bars first and then create the alloy using copper bars. This allows you to produce a few silver bars in addition to the bars of alloy, but does require additional fuel, dwarf effort, and time. Note, however, that when producing billon from two tetrahedrite nuggets, the benefits of using tetrahedrite as a silver-bearing ore outweigh the drawbacks of using tetrahedrite as a copper-bearing ore.