Lornuan ruins are ancient ruins that are 5,000 years old, little is known about the original inhabitants, the scale of the place suggest that it supported a large number of people a city or similar hub in the ancient world. It was here in a deep chamber filled with earth and gravel Stargate were found.
Only a few other revealing artifacts have been removed from the ruins - the remains of pottery and simple tools - although excavation continues in hopes of finding more. In truth, the place has little of value, even though there may be a stray Goa'uld artifact or two in the deepest recesses undetected. Mesta underground chamber was filled by the Goa'uld abandoned planet and protected from Naquadah-sensing device, so only dig and explore can dig them out. Considering Eldeoran nas sedate pace and propensity for planning, it may take decades before such taxes sees the light. (RPG: "First Steps: The Stargate Unexplored Worlds Roleplaying Sourcebook")