40d:Tetrahedrite

Tetrahedrite

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Uses
Ore of silver (20%) Ore of copper Make trifle pewter bars at smelter (with cassiterite) Make fine pewter bars at smelter (with cassiterite) Make billon bars at smelter (with silver nuggets, horn silver, galena, or tetrahedrite) Make electrum bars at smelter (with gold nuggets) Make bronze bars at smelter (with cassiterite) Make brass bars at smelter (with sphalerite) Masonry Stone crafting Construction
Location
All stone Found as veins
Properties
Economic stone Material value 3
Wikipedia article

Tetrahedrite is an unusual ore. When smelted, it produces a copper bar and has a 20% chance of also producing a silver bar. Can be used to smelt 6 different alloys - trifle pewter, fine pewter, billon, electrum, bronze, and brass.

It has a value modifier of 3, and can appear in any stone layer.

When smelting billon, tetrahedrite counts as both copper and silver ore at the same time and produces two billon bars for one ore; this may be a bug.

It is worth considering to smelt electrum from Tetarahedrite and gold nuggets, because this way you'll get more value. For example, if we have 5 tetrahedrite and 5 gold nuggets, then smelting them indifidually will give 5 gold bars (value 150), 5 copper bars (value 10) and, on average, 1 silver bar (value 10), to the total value of 170. But smelting them to electrum will give 10 electrum bars with a value of 200.