Warehouse

The warehouse does two things at once: like any building it adds +20% mining speed per level, and it also caps how much ore and gold you can hold.

The rule is simple: every level doubles the capacity. The cap applies to ore and to gold separately, they do not share one space.
Warehouse levelCapacityAfter upgradeCost of this level, CROWN
020 00040 000
140 00080 000200
280 000160 000400
3160 000320 000600
4320 000640 000800
5640 0001 280 0001 000
61 280 0002 560 0001 200

What happens when it is full

Mining of that resource stops. Anything the drill would have produced above the cap is simply not credited: it is not delayed or queued, it is lost. That is why long auto-mining without an upgraded warehouse runs empty.

Hours the warehouse lasts = capacity ÷ mining per hour

Example: at 6,000 per hour a level 0 warehouse fills in about 3 hours, and to use a 72-hour auto-mining window in full you need level 5.

When the warehouse fills up and you are away, the bot sends a notice: mining stopped, this much is stored, come and collect.

Where the capacity is shown

In three places: on the main screen next to ore and gold, on the warehouse card in the shop, and in the upgrade window, which also shows how much is stored right now.

Sending to Crownville

Ore and gold from the warehouse can be moved to your Crownville city: the button is in the chest, minimum 1,000 per transfer. It travels by the same Telegram account, so the city must already exist, otherwise the transfer is refused.

Resources never come back from the city to the mine. Gems cannot be sent yet, they will be used in other games of the ecosystem.