Depends on your chain, but 5/16 is usually close to (a little under) one pound/foot. So you probably have +/- 200 pounds. Where I live (opposite coast) all ferrous metal is pretty much 'no pay/no charge', which means you can dump it with the recyclers, but won't get anything for it. When things are really good you can get up to $0.10/pound.
Trying to convince a recycler that what you have is high quality steel
deserving of respect and a decent price
is a tough row to hoe unless you're a regular customer.