Thanks for your question. I can’t say for sure what a fair market value range might be for your minerals without doing a more detailed analysis but I will say that there is a lot of recent activity in 10N-59W (recent drilling permit applications by 8 North and Bison). Given this and somewhat recently drilled wells to the East and South as data points from a production standpoint, there should be a good level of interest in this area for potential buyers. This Township is in the Pawnee National Grasslands so there may be additional hurdles that companies might need to go through in order to drill there (from an environmental standpoint).
I have seen values in 9N-59W ranging from $3500 - $9000 based on results of economic valuations and asking prices in that Township. That was over a year ago so things have changed and that is also in a much more developed part of the Pawnee National Grasslands.
My advice is generally to hold on to minerals unless you need money right away. Given recent permit activity, there is a chance that a well or multiple wells could get drilled in this area in the not to distant future. If you are unleased, you could proactively solicit lease offers for your minerals to get some cash now (lease bonus) while still maintaining control and upside potential from any royalties.
Please let me know if you have any questions!