I'm Stumped by this Chinese Geoglyph

Originally posted by myself at 2012Forum.com, and nobody could tell me what it really is, so I'm asking the audience of this blog for ideas...

AstralWalker's talk in Melbourne last month had some slides about GeoGlyphs. It was interesting hearing all the gasps in the audience when he showed the Chinese pyramids...

But this, I have not seen before:

http://www.gearthhacks.com/downloads/map.php?file=20423

It is in China, near the Mongolian border
It is big - looks like hills etc don't get in the way

The difficulty in determining what it is comes from the huge range of existing geoglyphs, that range from modern art like Colonel Sanders and the Firefox logo, to the ancient Nazca Lines. Without inspecting them at ground level, it is very hard to determine age and technique.

The best suggestion at the forum was that this is something like a quarry, and a large grader was used by someone who was on more then just a random mission:

There is clearly watershed over it in spots. The dimensions are roughly 1 mile square and the lines themselves average 50 foot wide. I can understand a mock runway and village but a mosaic pattern makes no sense to me even for a bored machine operator.

Scroll left when at Google Maps and there is a large square area that might be a clue...