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You can configure it to produce any resource you want. It works the same as the normal miner, you need to build it on resource terrain, and the amount of resource terrain underneath it determines its effectiveness. The color will be darker if there's not a lot of resource terrain underneath.
By default they mine energy / bluite by the same rate per resource tile as a normal miner, though they're slightly more expensive per tile.
You can even set them to auto-manage themselves and they'll switch resources when storage is full, but you'd gain more effectiveness doing it manually in most cases. Their logic is simple and they'll pick randomly from a resource that isn't near full, or stay on the same resource if all resources are near the cap.
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