US Armed Forces - Europe
Only Farmer can produce Alpaca by using Food.
Miner can produce Ore by using Food.
This is incorrect. The farm produces food, wool and cloth. The mine produces stone and silver. Alpaca can be used to produce food, wool and cloth (latter two need a food too). The mine produces stone with 2 food and silver with ore and food.
Think you may have mixed those up a bit.
You misunderstood "Farmer" (starting role) with "Farm" (location) and "Miner" (starting role) with "Mine" (location).
The starting roles have role-specific actions that produce these goods