Gary,
I have been working on a some what similar problem for a while. Basically in my case it was a concrete pad about ~100'-200' by 30-40'ft. The problem was it was pourly done as a temporary pad for trailers. The result is that in some places it was 1" thick and in others 4".
So my solution was a bobcat mounted jack hammer. One weekend of hard work and I had it all broken up. I then used a dozer to pile it up into a long windrow like pile.
Here is where my problem shares some of the same aspects as yours. This pile turned out to A) be a lot of material and B) be very hard to load.
The chunks and debry were hard to get a bucket full with my tractor.
So I switched to a skidsteer loader. This was marginally better. At least I could see what the bucket was doing and manuver to get a good bucket full from the pile.
The problem then was that the wheeled skidsteer lost traction way before it got a bucket load.
The ultimately soultion turned out to be a tracked skidsteer loader. I rented this unit for a weekend and now the pile is almost gone. The tracked loader could power into a pile and come up with a full bucket almost every time.
My approach is to use the skidsteer to load a dump trailer that I tow with my tractor. I own the dump trailer so I wired it up to allow me to dump from inside the cab. I just leave the tail gate off, load it up with the skidsteer, then tow the trailer to an area that needs some erosion control and dump it.
With some practice I could load and dump a full trailer in 20-30 min flat. The problem for me is I need a lot of trailer loads to get ride of this pile.
So my suggestion to you would be to try and get a tracked skidsteer for a weekend. One negative is that the tracked skisteers, not just a wheeled unit with tracks added, are a good deal more heavy to tow. Probably at least 7500 lbs for the loader by itself.
One other plus is no flats.
Fred