This is the 11438th most frequent Russian word.
добытых
"Extracted" or "mined."
The word "добытых" serves as a past participle to describe the minerals that have been extracted from the earth.
Полезные ископаемые, добытых из недр земли, используются в промышленности.
Minerals, extracted from the earth's interior, are used in industry.
The word "добытых" is used to refer to the materials obtained during the expedition.
Количество материалов, добытых во время экспедиции, впечатлило учёных.
The quantity of materials obtained during the expedition impressed the scientists.
Here, "добытых" modifies "уголь" to specify that it is coal that has been mined.