The discussion centers on estimating the total amount of gold in the Earth and its value. It is suggested that all the gold mined could fit into a cube measuring 10 meters on each side, totaling approximately 19 million kg, valued at around $130 billion. However, participants argue that this figure seems low, with estimates suggesting the total value could be closer to $251 billion or even $233 trillion when considering global holdings. The conversation also touches on the vast amounts of gold believed to exist in the Earth's core and the challenges of accessing it due to its density and reactivity. Ultimately, the amount of gold in the Earth and what humanity has extracted are seen as two distinct questions.