While extraction involves pilfering goodies from dead baddies, harvesting is the more uh... humane method of gathering resources from nodes such as ore deposits, trees, and so forth. Harvesting resources from a single node works in the same way as extracting resources from a corpse does, but harvestable resources are also available from rarely occurring resource clusters. These clusters "contain a larger stash of a single resource and [have] a better chance of yielding higher quality results." Up to four players can place a harvester at any given cluster, which will run dry after 2-4 hours, at which point the players can return to the cluster and pick up their share of the goods. This system, the diary mentions, encourages players to gather in groups or share the wealth with their hired help. If you can't wait to get your hands dirty and rob nature of her delicious bounty, you can find out all the details over at the game's official site.