Huge pile of .30cal brass shell casings and M1 clips

So I had some free time earlier today and decided to swing by an old power line outfall that is a popular dump site. It had been recently mowed so it didn’t look like there was much there, but I walked down a little ways just in case. And I happened to notice what looked like a few spent shell casings laying on the ground. As I was picking them up, I realized that it was actually a huge pile, mostly buried. Thousands of .45ACP and .30cal casings, and M1 Garand clips. They have obviously been there for a long time, and all of the steel clips are badly rusted. I haven’t finished cleaning and checking for live rounds yet, but so far it’s well over 100lbs of brass. They are quite tarnished, and most of them are partially crushed. Is there any reason you guys know of why a yard wouldn’t accept these? And the going rate seems to be around $1-2 per pound, I’m not sure what kind of price to expect, seeing as these shells are old. Uploading images seems to be disabled right now, but I’ll try again when I get to my laptop.
Long time lurker, first time posting.
Thanks,
Miles