Gold is the main resource for units and upgrades in Stick Empires. Each side has two rows of gold, the one being closer to the statue being referred to as the first row, with the second row being referred to as the second row of gold.
Each side has miners to mine gold for their side. The miners will walk up to a gold deposit and swing their pickaxe. Eventually, they will walk back to the castle and the player will have 75 more gold at this point and repeat the process of mining the gold.
There are 3 ways in which a player can get gold. The first is through mining the gold piles itself, which is the most efficient way. The second is through the tower - which gives 20 gold every 5 seconds, being the equivalent of approximately 2 miners on the first row. The last method is by researching the Passive Upgrades, where you will get a slow, fairly low amount of gold & mana every few seconds.
Gold resources from the opponent's side of the map can also be mined, although the gold return takes an extremely long time, so this is more of a humiliation tactic than a useful ability. (Often times, miners will try to mine the gold on your side when you tell them to mine enemy gold as they think it is closer, so the miners need to be very close to the enemy gold supplies when instructed to actually mine them.)
One Gold Stack is approximately 2500 gold.
In the beta, miners used to mine slower and instead of carrying 75 gold, they carried 150. Twice as much gold.