Apologies, accessibility is 1, making it by far the best source in the system.

All the planets and potentially habitable moons have been surveyed, if they are not on this list they do not have minerals. The other moons, the asteroids, and the comets have no information available.

Saturn don't got no minerals!

Here are the relevant stats for the respective homeworlds as well as a mineral report on the known surveyed bodies in the system, Earth is a special case and will be described in the next post.

Venus:  Colony Cost: 0.00,  Temperature: 27.1,  Gravity: 0.91,  Orbit: 108m Nitrogen 53%, Oxygen (0.2) 26.7%, Safe Greenhouse Gas 20.0%, Pressure: 0.75
   
Mars:  Colony Cost: 0.00,  Temperature: 25.8,  Gravity: 0.38,  Orbit: 229m Safe Greenhouse Gas 45%, Nitrogen 36%, Oxygen (0.1) 18.1%, Carbon Dioxide 0.54%,  Pressure: 0.55

Ganymede:  Colony Cost: 0.00,  Temperature: -6.8,  Gravity: 0.15, Orbit: 1.07m Safe Greenhouse Gas 77%, Nitrogen 15.4%, Oxygen (0.1) 7.7%,  Pressure: 1.30

Venus and Mars make excellent vacation spots, Ganymede is cold as balls and has a thick atmosphere. Also of note is the low Oxygen content compared to Earth of all the homeworlds, this is due not to laziness on the part of the game creator, but because initial terraforming was done only until things were good enough, plans to make everything a lot more perfect went by the wayside once the wars started.

Mineral Report:

Venus
Duranium 65,700  Acc: 0.9
Neutronium 28,470  Acc: 0.2
Corbomite 26,910  Acc: 0.2
Tritanium 57,930  Acc: 1
Boronide 14,550  Acc: 0.2
Mercassium 22,410  Acc: 0.3
Vendarite 29,460  Acc: 0.2
Sorium 370,875  Acc: 0.9
Uridium 49,710  Acc: 0.3
Corundium 18,060  Acc: 0.2
Gallicite 13,680  Acc: 0.5

Mars
Duranium 101,100  Acc: 1
Neutronium 71,300  Acc: 0.2
Corbomite 53,200  Acc: 0.2
Tritanium 109,000  Acc: 0.2
Boronide 69,400  Acc: 0.4
Mercassium 186,700  Acc: 0.9
Vendarite 94,400  Acc: 0.2
Sorium 290,000  Acc: 1
Uridium 82,400  Acc: 0.2
Corundium 106,400  Acc: 0.9
Gallicite 52,000  Acc: 0.4

Jupiter
Sorium 1,615,000  Acc: 0.6

Europa
Vendarite 3,939  Acc: 0.3

Ganymede
Duranium 154,620  Acc: 0.9
Neutronium 57,690  Acc: 0.3
Corbomite 29,190  Acc: 0.2
Tritanium 27,930  Acc: 0.2
Boronide 36,300  Acc: 0.6
Mercassium 22,890  Acc: 0.9
Vendarite 24,270  Acc: 0.8
Sorium 430,425  Acc: 0.7
Uridium 10,440  Acc: 0.2
Corundium 26,370  Acc: 0.7
Gallicite 36,800  Acc: 0.4

Titan
Duranium 11,233,040  Acc: 0.7
Uridium 679,503  Acc: 0.1

Neptune
Sorium 10,349,680  Acc: 0

These are based on pre-war survey records which are incomplete at best, the new factions only have survey knowledge of the 8 planets, Pluto, and the potentially terraformable moons.