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How do you upgrade quarry excavators to level 2?
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How do you upgrade quarry excavators to level 2?
I was having this issue and ended up upgrading the timber yard all the way and then it let me upgrade the sand quarry and ore mining
Complete the Mining development projects till it reaches the level 2 of the sand. You will have to complete the lumber and iron ore first. Then it will give you the 2nd level upgrade after about 6 missions in the miniing development.
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