Hmm, that's strange. When you jump into Elio the traders should be waiting for you right near the portal and you should receive a quest to escort them to the mine. You didn't get that part? Can you try reloading to somewhere before you save the traders and try that again?

When you kill all the pirates, there should be a dialog with the traders you just saved. If you didn't get this before, try waiting for them to say anything before jumping through the portal to Elio.