Editing Miscellany (section)

===Improving Land Values===
Some of the hexes include resources (such as herbs, mines, lumber, etc.). You may decide to either use the resources directly until they are depleted, in which case you get the gp value of whatever the resource is worth. So, if there's a stand of timber worth 750 gp you can harvest it and get the cash, or a mine can be worked until all the ore has been extracted, etc. 

The other choice would be to ration the resource, in which case it will increase the land value by some fractional amount, yielding potentially more revenue over the long term.