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Deep sea mining is the extraction of minerals from the seabed of the deep sea. The main ores of commercial interest are polymetallic nodules, which are found at depths of 4–6 km (2.5–3.7 mi) primarily on the abyssal plain.
The spread of coal use was gradual until the late 11th century when a timber shortage in north China produced a fast-paced expansion in coal mining and consumption. [12] In 1000 AD, Chinese mines were ahead of most mining advancements [clarification needed] in the world. [13] Coal mines in China faced similar problems to European ones.