That is called deep mining.
hard rock mining, underground mining
focus UwU
Fault movement begins deep within the Earth at a point called the fault plane. This is the surface within the Earth where rocks on either side have moved relative to each other. The movement along the fault plane is what causes earthquakes.
focus UwU
The fault movement that begins deep within the earth at a point is called the focus or hypocenter of an earthquake. This is the point where the energy is first released, leading to the rupture of the fault and the subsequent shaking of the ground.
A deep crack in the earth's surface is called a fault.
Diamonds are formed deep within the earth's mantle.
Magma if it's beneath the crust, lava if it's above the crust
Molten rock deep beneath the Earth's crust is called magma.
subduction
Fermium is an artificial element.
fault