how to earn arx

I thought that by logging in and playing the game I would earn a small amount of arx, but in 2 weeks of mining with over 1000 limpets spent I haven't gotten more than a couple, and that was for the few jumps I did going between mining spots. Is this an oversight? Miners deserve arx too ✌️

From a number of threads that have been read I was under the impression that ARX earned was based on Credits. One guy posted that he'd calc'd it out and it worked out to around 1 ARX per million sold (for me it's about 1 ARX per 100K). Some threads implied you didn't earn ARX for exploration...