It may be a ground cable. I do not know much about such though from what you posted(and without an image to go by)my guess is its a cable that is used by electricians to ground future or in this case previous construction site electrical systems. Purely speculation of course. Across the street from my home I watched as a fitness place was built. Daily I witnessed the construction process from start to operation. While the foundation was being, after concrete was poured, a worker aproached me and asked if I would walk over every hour an a half & spray down the concrete.(This was last summer & it was in the triple digits often) While I was spraying I noticed a big round cable sticking out of the ground. It appeared to have been uprooted when Machinery had broken the ground in order to prepare for building. At least that is what I assumed at the time. Although I was tempted to dig it out and find the end of it which was buried, I left it alone in hopes that perhaps I could talk one of the workers out of it the following day if it was to be tossed in the garbage bin. I approached one of the workers the next morning and asked but we have plans that old cable. He replied that it was a future ground for the building. And as you can guess, it stayed where it was. So from what I gather from your post, it sounds similar to my experience. Although I could be off by a long shot.
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