Working Interest Valuation

We received an offer from an Antero Landman regarding a working interest in Doddridge county that my Dad purchased in 1974. It appears to be about 8 acres, and it has a well on it that has not produced since the early 90's.

How would one go about valuing this offer and does anyone have any advice on whether to stay in the lease and be a player or just sell to them and let them take the risk?

No one would try to value the offer outside of yourself and the landman making it. The reason is that no one here has been told what the offer was.