Be careful of going overweight (there will be a notification when you are overweight, and the yellow weight bar next to the inventory icon will flash orange). While you can carry as much stuff as you want, if you're overweight, you get a stamina penalty which if you're heavily overweight will kill you quickly. Drop ores if you're holding too many, and make sure to make return trips to the storehouse to drop off ore and rest in the hut to restore stamina. Bringing food along to restore stamina also helps and can lengthen your trips.