Where did the uranium in the aquifer come from?

Uranium is one of the most abundant elements found in Earth’s crust, and it can be found almost everywhere – from soils and rocks to rivers and oceans. It is slightly more abundant than tin and 40 times more abundant that silver. Uranium was originally deposited on land by volcanic action over time, before being dissolved by rainwater and carried into underground formations. Eventually, the flow of underground water concentrates the uranium into ore bodies.