Found this in a very steep and rocky arroyo ABOVE many cliffs/waterfalls. Found somewhere near badger creek in central Colorado. Far from any roads or trails. didn't have time to hike higher up the mountain. Looks quite old from the condition,appears to at one time been a sled or sledge for ore. Notice in the upper left quadrant possibly a skid rail? All of the iron pieces are extremely rusted maybe only 1/32 inch thick anymore. Notice the long spikes bent over "dead-nail" style. Also see the square head lag bolt, looked cast but hard to tell through the rust. Anyway if anyone has any idea what this is it would be greatly appreciated.