Workers are here to work tirelessly on your Island. Give them a task and they will do it endlessly, for as long as your Island remains loaded; however, providing "Food" can give bonus offline work time.
The way to assign a task to your Worker is by using an item “Core” that corresponds to the material you want. Keep in mind that there is a limit to the amount of Workers an Island can hold. You are able to unlock one Worker of each type on an Island by upgrading your Worker Warehouse.
This example previews a Miner Worker with a rarity 3 emerald Core, a Turkey Leg, and a magical permanent Catalyst!