Issue description:
Along with Tinkers' Construct, I have Immersive Engineering and Forestry, both of which add certain ores. As promised on the main page, most of these ores were added into Tinkers' Construct automatically, except for Tin from Forestry. I haven't tried it with a smeltery, as I have not built one yet, but Tin is not included in the Materials and You material guide.
If crashed, link to crash report (use a site such as pastebin):

Versions:

• Minecraft: 1.12.2
• Forge: release 1.12.2-forge1.12.2-14.23.5.2838
• Mantle: Mantle-1.12-1.3.3.55
• Tinkers Construct: TConstruct-1.12.2-2.12.0.157

Can it be reproduced with just Tinkers Construct? If not, list the other mods required to reproduce the issue.
Forestry; you can also add Immersive Engineering if you want.

It does not show in the book as it is not a valid tool material. We add integration to melt tin down, but not as a tool material. You must alloy it with copper to make bronze to make tools.