Quite simply because there is no easy way to do it. Working at depth brings with it problems that current technology can't address easily.
water power,mineral and deposits
internal piping has mineral deposits
They are called mineral deposits or precipitated minerals.
Stalactites are formations that hang from the ceilings of caves, formed by mineral deposits left behind by water dripping.
One of the most common issues with mineral deposits people experience is the build up of calcium deposits in the body. One alternative healing method for removing the mineral deposits is to drink a mixture of honey, apple cider vinegar, and water until the deposits are removed from the body. The mixture helps to breakdown the excess calcium.
These minerals are dissolved in the water while it moves through the earth.
Nearby water supplies dry up
Mineral deposits from use of hard water.
Dried mineral water helps form various mineral deposits, such as salt or other crystalline formations, when water evaporates and leaves behind dissolved minerals. It can also contribute to the formation of geological features, like stalactites and stalagmites in caves, where mineral-rich water drips and deposits minerals over time. Additionally, dried mineral water can enhance soil quality by enriching it with essential trace minerals.
Mineral deposits are formed when ground water that contains dissolved minerals are cooled or has evaporated. Some of these mineral deposits are iron ions, magnesium, and calcium.
Stalagmites are mineral deposits that grow upward from the floor of a cave, formed by dripping water containing dissolved minerals. Stalactites are formations that hang from the ceiling of a cave, formed by mineral deposits left behind as water drips from the ceiling.
Mineral deposits form when minerals dissolve in water and then solidify in cracks or spaces in rocks. Over time, these deposits can become buried underground through processes like sedimentation, volcanic activity, or tectonic movements.