This mod is an updated version of the 1.7.10 mod called "Ore Spiders." Although the mod has been made obsolete by Cane's Wonderful Spiders, it is still worth trying. Ore spiders was a mod coded by Bendonnelly1, textured by Vaderman24, and the idea came from a user who goes by the name ThatEnderBlender. The mod adds 11 new spiders to the game, most of the spiders match up with an ore currently in the game, and they drop that item when killed. For the original mod download the "Ore Spiders Legacy" version. The Newer version has upgraded models, and has new spiders. (And there will be more.)

The Spiders:

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To fight the Queen Spider:

You must first craft the Queen Spiders eye.

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Once you have done so four times you can craft the "Mysterious Potion."

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Throwing the potion on the ground will spawn the Mini Boss.

Killing the Queen Spider will always drop the "Orb Weaver."

This item, when right clicked, will launch a projectile. Upon hitting an entity or block, that projectile will create a cobweb.

Additional Information:

All of the information on the old mod is accurate for this one as well:
The Coal Spider spawns pretty much everywhere, just like coal ore does.
The Ender Spider will only spawn in the End, as it would be too difficult to fight in the over-world. However, It may change it if people request it.
The Nether-Quartz Spider will only spawn in the Nether.
The Obsidian Spider spawns close to obsidian, usually within a 8x8x8 cube of an obsidian block. They are quite rare because of this spawning condition.
Every Spider has 50% chance of dropping their respective drop, so long as they die by the players sword.
If a Spider were to die by fire or lava, it will not drop anything.
If a Spider dies by a sword with looting, it still has a 50% chance of dropping, but it will drop significantly more.
Now for the new Information:
Hardcoded the spiders to drop one of their special item regardless of the 50% drop
Obsidian spider spawns are changed to a 9x9x9 area.
Ore Spiders will mostly spawn in caves.
I used deprecated API to add the Spiders to the spawntable, ignore the errors. If this causes an incompatibility let me know, I will deal with it. I just like to use that specific method.

Ore Spiders Revived