Value of a particular mineral right

A client of mine has recently been offered a minimal amount ($100) for a small interest (1/4 of 3/8) she owns in mineral rights located on 80 acres in Montague County, Texas. The legal description is as follows: 80 acres of land, more or less, being all of the East 1/2, of the Southwest 1/4, of Section 1, Jack County School Land Survey, Abstract 390 Montague County, Texas (mineral interest only).

Would anyone have an idea what an interest such as this would truly be worth? Is their currently development activity in that particular area?

$100 to buy 8 mineral acres or to lease per acre?

$100 to reliquish any interest she may have in the 8 mineral acres via a Quit Claim deed.

Wade Caldwell said:

$100 to buy 8 mineral acres or to lease per acre?

Not sure of activity in the area, but no way on the price.