Metallurgy_3.0.0.0.11.3.jar is a release file of the Minecraft mod Metallurgy, made for Minecraft 1.5.2. It was published on June 21, 2013 and is 1 MB in size. For the full description, screenshots and every other version, visit the Metallurgy mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.