Originally posted by nathan.panke:

Any place with a 3 of the following can be a base: Workbench, Bed, Fire, Portal.

If you want to make a satellite camp, make sure you only have 2 of those things built. I usually have a portal and fire, then delete the workbench when I'm done setting up.

Then your little mining base doesn't get stomped by raids.

You can only have 2 structures built in a given area, that list includes way more than just workbenches, beds, fires and portals. Pretty much every structure not in the building tab qualifies as a player base object (as these objects prevent enemy spawning within a 20m radius)

Thus a temp base of just a campfire and bed will not cause raids, but placing a chest down nearby as well will cause raids to occur.