Installation instructions:

For general instructions to install a mod, read this:
http://www.minecraftwiki.net/wiki/Mods/Installing_Mods

This mod requires Forge. Download and install before installing this one. You can get that here:
http://www.minecraftforge.net/forum/index.php/board,3.0.html

Once you have Forge installed, do this:

Windows ME/95/98/XP:
1. Click start.
2. Click Run....
3. Type %AppData%.
4. Open .minecraft.
5. You will see a folder called "mods". Copy mithril.zip to the mods folder.

Windows Vista/7:
1. Click the Start Icon.
2. In the Search Bar, type %AppData% and press Enter.
3. Open Roaming.
4. Open .minecraft.
5. You will see a folder called "mods". Copy mithril.zip to the mods folder.

Macintosh:
1. Click Finder.
2. From menu, choose Go, Go to Folder.
3. Enter "~/Library/Application Support/minecraft/"
4. Open "bin"
5. Install decompression software. (The Unarchiver on the app store)
6. Decompress mincraft.jar file
7. Exit file and add extension .jar to the name
8. Go back up to "~/Library/Application Support/minecraft/", then open folder "mods". Copy mithril.zip to the mods folder.

Minecraft Server:
1. First setup your Minecraft Server. For Windows, download the installer here:
https://s3.amazonaws.com/MinecraftDownload/launcher/Minecraft_Server.exe
For all other platforms, instructions are here:
http://www.minecraftwiki.net/wiki/Setting_up_a_server
The jar file for Mincraft Server mentioned in that article is available here:
https://s3.amazonaws.com/MinecraftDownload/launcher/minecraft_server.jar
2. Second, install Forge in your server. Download the Universal version, not any other. Get that here:
http://www.minecraftforge.net/forum/index.php/topic,4804.0.html
Installing Forge on a server is much easier than a client. Instructions are here:
http://www.minecraftforge.net/wiki/Installation/Universal
3. Shutdown your Minecraft server with the command "/stop".
4. Forge installation will create a folder named "mods". Copy this zip file to that folder.
5. Start your server with Forge and mods, start it with the same command you used to install Forge.