What is the term used for rainwater the seeps underground as it travels through tiny spaces between rocks and soil particles?

What is the term used for rainwater the seeps underground as it travels through tiny spaces between rocks and soil particles?

The term is - infiltration

This can be defined as the process by which water travels through rock or soil through small pores or tiny spaces often called joints present between  rocks and soil particles.    

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.