You really need to look up Chris's youtube videos of him using mats because I have a feeling you don't much about them, your not going to build any kind of haul road out of mats for trucks. You'll need 5 or 6 mats just to walk an excavator out and make sure you have a decent hoe operator that knows what he's doing and doesn't slide off. We've done like AEL is speaking off and had to throw the material a couple times to get it to a place to load out. The more you throw the material and stir it up and worst the water will come up and become a real headache, but sometimes you have to. I'd still like to know what kind of conditions are under the 3' of mud. I know you have water in part of the lake, but you might have to pump it around or clean half and let the water drain over. Might over dig half that you can access easy and them fill it with the mud from the other side. There's all kinds of ways. Long reach will help also, but dipping with a little bucket feels like it takes forever, butt anything will be better than a little mini, I can't even imagine tackling something like this with a mini. Keep in mind 30' mats suction cup down in the mud will are be hard to pull out, most of our mats are 20 footers.