what you do depending on the skill is you go to the script for that skill example Mining under where addOre is you add the ore then the money so should look like this
Code:
player.getInventory().addItem(955, 1000);
too add to inventory or you could add to money pouch by this
player.getPouch().addMoney(100);
player.getPouch()refreshPouch(true);
so the codes above will add 100 gp to pouch and refresh pouch so it will show how much exactly is in your pouch .
means you will obtain 1000 gp per time you mine a ore. can set them to do it for all ores different prices even different skills.