Mining and power
Power is the only thing you buy directly. Everything else multiplies it. The result is measured in shards, and shards turn into CROWN through the daily pool.
Drills: base power
Drill power stacks: buying the iron drill on top of the bronze one gives you 5, not 4. The wooden drill stays in your chest forever and adds its 0.02.
| Drill | Power | Presale | In-game price | CROWN per day | Payback |
|---|---|---|---|---|---|
 Wooden Drill | +0.02 | — | free, everyone has it | 0.13 | — |
 Bronze Drill | +1 | 1 GRAM | 200 CROWN | 6.48 | 30.85 days |
 Iron Drill | +4 | 3 GRAM | 600 CROWN | 25.93 | 23.14 days |
 Steel Drill | +15 | 10 GRAM | 2,000 CROWN | 97.24 | 20.57 days |
 Mithril Drill | +50 | 30 GRAM | 6,000 CROWN | 324.14 | 18.51 days |
 Royal Drill | +130 | 70 GRAM | 14,000 CROWN | 842.75 | 16.61 days |
 Diamond Drill | +300 | 150 GRAM | 30,000 CROWN | 1944.81 | 15.43 days |
Hired miners: power on top of the drill
Besides drills, base power comes from hired miners: the Hired Miner (+45) and the Master Driller (+100). They are bought in the shop under “Miners”, work next to your drill in the shaft, and their power is multiplied by buildings, boosts and depth the same way. You can hire both, their power adds up.
Buildings: the speed multiplier
Every level of any building adds +20% mining speed, and levels of all four buildings stack. Upgrades are unlimited, the next level costs linearly more.
| Building | Per level | Level cost, CROWN | Examples |
|---|---|---|---|
 Mine Shaft | +20% | 200 × level | lv 1 200 · lv 2 400 · lv 3 600 · lv 5 1,000 |
 Elevator | +20% | 300 × level | lv 1 300 · lv 2 600 · lv 3 900 · lv 5 1,500 |
 Warehouse | +20% | 400 × level | lv 1 400 · lv 2 800 · lv 3 1,200 · lv 5 2,000 |
 Smeltery | +20% | 600 × level | lv 1 600 · lv 2 1,200 · lv 3 1,800 · lv 5 3,000 |
The first level of each building was also sold in the presale for GRAM: Mine Shaft — 5 GRAM, Elevator — 10 GRAM, Warehouse — 15 GRAM, Smeltery — 30 GRAM.
Boosts: buy once, keep forever
Boosts never expire and stack with each other: all three together give +60%.
| Boost | Speed | Presale | In-game price |
|---|---|---|---|
 Small Pack | +10% | 3 GRAM | 600 CROWN |
| Medium Pack | +20% | 10 GRAM | 2,000 CROWN |
| Large Pack | +30% | 30 GRAM | 6,000 CROWN |
Depth: the deeper you go, the more you mine
Depth is the only multiplier that grows on its own, with nothing to buy. Every 5,000 metres add +5% to shard output, capped at +100% at 100,000 metres. Depth is never reset and is not lost when you close the game.
| Depth | Shard bonus | Descent at power 50, click 0 | Power 300, click lv 40 |
|---|---|---|---|
| 5,000 m | +5% | 15.43 h | 1.68 h |
| 10,000 m | +10% | 30.86 h | 3.37 h |
| 25,000 m | +25% | 3.21 days | 8.42 h |
| 50,000 m | +50% | 6.43 days | 16.84 h |
| 100,000 m | +100% | 12.86 days | 33.67 h |
The depth multiplier sits in the shard formula, so it raises your share of the daily CROWN pool. Ore and gold do not depend on depth: they come from the metres you drill and the layer the drill is in.
Descent is computed on the server, the client only draws it. Base speed is 300 m/h, multiplied by the click upgrade (+15% per level) and by mining power (square root of (1 + power ÷ 300)): at power 300 the descent is 1.4× the base, at 1,200 it is 2.2×. Every counted tap adds 1 second of descent; once the daily tap limit is used up, taps no longer move depth. Depth keeps growing with the game closed, within the same window as offline mining: 2 hours by default, auto-mining extends it. Visually the drill slows in rock and ore and speeds up in soil, but over a layer cycle this averages out exactly to the server speed. The “Speed ×N” booster really accelerates the descent while it lasts.
Rock layers
The shaft is made of layers. In empty rock the drill moves faster but yields nothing; in ore and gold layers it is slower but pays.
| Layer | Share of shaft | Yield |
|---|---|---|
| Soil | 70% | empty |
| Rock | 15% | empty |
| Iron ore | 7% | ore |
| Gold vein | 8% | gold |