The attached map shows your minerals in yellow. They are located just outside the old Scott Field, which produced a lot of oil through vertical wells into the Parkman Sandstone, but is all but finished now. It appears that you missed out on that, but just barely. 35N 71W.pdf (78.7 KB)
As for modern activity, you can see the horizontal wells that have been drilled in the area. Most of these were drilled by Chesapeake in 2011 and 2012 into the Niobrara Shale, and most of them were uneconomic, meaning they didn’t make enough oil and gas to pay for the cost of drilling them.
Chesapeake and Anschutz Oil have recently permitted a lot of wells in and around your minerals and my be moving forward toward drilling some of them. I believe they are targeting different geologic formations as well as making another attempt at the Niobrara.
If you don’t need the money right now, I would hold onto them and see what develops.