The Economic Research Upgrade: Heavy Metal boosts the Metal Production for the Mines in the players city.
| Level | Metal Production Boost |
|---|---|
| 1 | +1% |
| 2 | +3% |
| 3 | +6% |
| 4 | +10% |
| 5 | +15% |
| 6 | +22% |
| 7 | +31% |
| 8 | +43% |
| 9 | +58% |
| 10 | +78% |
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Heavy Metal
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