If you look at the abundance of elements in earth's crust aluminum is #3. It we use the CRC number from https://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth%27s_crust we have

• Oxygen 46%
• Silicon 28%
• Aluminium 8.2%
• Iron 5.6%

So there is an enormous amount of aluminum. Most of it we use are in the for mof bauxite that is aluminum o

Aluminum is also recycled to a high degree. The primary reason is not the availability of bauxite ore. The primary reason is that the energy required to of recycling is 5% of the energy required to make it from ore. Aluminum requires a huge amount of electric energy to refine.

36% of the aluminum produced in the US comes from scrap. Globally the recycling rate is around 76% and it is estimated that 75% of all aluminum ever produced is still in usage.