mercury orbits only 58 million kilometers from the sun, which makes it the hottest planet.Tin,gold,iron and most metals would melt and flow like rivers on Mercury's surface.But Mercury revolves very slowly and during the long nights it becomes much cooler.Perhaps we could operate mobile mining stations to follow the night and mine the important minerals.We would have to make our own air because Mercury does not appear to have any free floating oxygen gas.However,we could easily operate all of our factories there by using heat energy from the nearby Sun.