* Gold: The mountain was said to be filled with an enormous treasure hoard, primarily gold, which was the dragon's most coveted possession.
* Jewels: The mountain also held a vast collection of precious gemstones, further fueling Smaug's greed.
* Other valuables: The mountain held a variety of other treasures, including art, artifacts, and other valuable materials that attracted the dragon's avarice.
Essentially, Smaug was attracted to the Lonely Mountain because it was a giant, glittering, treasure chest just waiting to be plundered. His greed and love of gold drove him to claim the mountain for his own.