I'm going to buy Amumu next...

-What Masteries for a level 16 would be most effective?
-Runes too please

normally you'd run something like mPen reds, Flat armor seals, and mr/level glyphs, HP quints.

but if you're level 16 i'd reccomend you get a leash on blue buff so you dont die. i hope you arent buying tier 2 runes also. they arent worth it and your IP is better spent on tier 3

give this guide a look. by far one of the best guides to the mummy
http://leaguecraft.com/strategies/gu...umu-tank.xhtml

I mostly agree with Lung there.

Defensive masteries + Smite mastery. Flash as other spell to setup ultimate.

If you want to jungle a lot, flat armor seals are the most overall useful. Tier 1 should hold you until Tier 3 is available.