Put in your skills, facilities available, and minerals required (Eventually you'll be able to save skills, if desired) and you'll get back the compressed ores which best fit that set. The maximum extra is so you can limit the overage on Ores. -1 means 'as much as you have to'

SkillSkill level
Refining
Refining Efficiency
Simple Ore Processing
Coherent Ore Processing
Variegated Ore Processing
Complex Ore Processing
Mercoxit Ore Processing
Ice Processing
Implant percentage
Facility Percentage
 help
Mineral TypeRequired QuantityMaximum Extra
Tritanium
Pyerite
Mexallon
Isogen
Nocxium
Zydrine
Megacyte
Morphite