Of the 5 ores this mod provides, 3 work because they are oreDictionaried as their end result. However I do not count Pyrite as an "ore" since it's only sulfur, no issue there. That being said, Galena Ore, is oreDictionaried as oreGalena (when end product is Lead), this is probably what's causing the issue with Tinker's Smeltery, the other 3 (Chalcopyrite -> oreCopper, Cobalite -> oreCobalt, Wolframite -> oreTungsten) work completely fine inside of Tinker's Smeltery.

https://github.com/SkySom/MeltsAMany/blob/master/src/main/java/io/sommers/meltsamany/MeltRegistry.java

Seems plausible

I've been looking at the Tinkers' Construct api, and seems to be imposible to add a smeltery recipe that produces lead and silver. I tried adding a recipe to get only silver from galena, but it doesn't allow to add recipes for fluids already registed and silver is already registered for silver ore.

I don't know how to fix this so until someone come up with an idea, I will close this issue

Thats because Galena is not a lead ore, it's a compound of lead and silver. I will eventually add support for Tinker's Construct