I just recently reached Hardmode on my first-ever Terraria world, smashing Demon Altars to unlock the three Hardmode ores. Finding cobalt ore has been a breeze; however, I have experienced great difficulty in finding orichalcum ore. I have mined deep down into the world, practically down to the Underworld, but I could find almost no orichalcum down there. I have tried using Spelunker Potions, but even with those, I barely found any orichalcum. I smashed twelve Demon Altars to generate more ore, but that still did not help. I have literally found more adamantite ore (which I cannot mine so far) than orichalcum ore.
What am I doing wrong? Is there anything I can do to find more orichalcum? Thank you in advance for your help.