As much as I hate to be "That Guy" who suggest another mod, I'm going to have to be "That Guy" this time.
I highly recommend installing Tinker's Construct along with Galacticraft. Not only will you get more ores generally, you can make stuff with the ores, like extra tools and weapons. (Shurikens are hilarious, and the crossbow is AMAZING!) and it increases your ore output as the TC "Smeltery" doubles the return rate on ores smelted. (IE: One ore block = two ingots instead of one) This allows you to be ready to get to space much more quickly. On top of that, the TC tools don't need enchants to be really really good, they use other ores to create modifications to the tools that give them boosts similar to enchants, but without the randomness and annoyance of enchanting.
So yeah. get TC installed. You won't regret it.