delving material
rocks and minerals that can be used for the benefit of humanity and which can be extracted from the ground economically advantageous
en-GB/ˈdɛlvɪŋ məˈtɪəɹɪəl/
en-US/ˈdɛlvɪŋ məˈtɪɹiəl/
rocks and minerals that can be used for the benefit of humanity and which can be extracted from the ground economically advantageous