Mining Stardew Valley Wiki
Mining Nodes. All nodes (other than the Geode Nodes) may be found in the Skull Cavern or Quarry. The quarry on the Hilltop Farm can spawn geode nodes and the 4 ore nodes (copper, iron, gold iridium). Diamond Nodes begin appearing at level 50 in the mines, at approximately 1 in 500 chance of appearing in place of a stone.