noun
gold field; goldfield
Refers to an area where gold is mined or found. A straightforward compound of 金 (gold), 鉱 (ore/mineral), and 地 (land/place).
この地域はかつて金鉱地として栄えた。
This area once flourished as a gold field.
新しい金鉱地が発見されたというニュースが流れた。
News spread that a new gold field had been discovered.
炭鉱地 means 'coal field' or 'coal mining area', following the same ～鉱地 pattern but for coal instead of gold.
Compound of 金 (きん, 'gold'), 鉱 (こう, 'ore' or 'mineral'), and 地 (ち, 'land' or 'place'). The word follows a standard Sino-Japanese pattern for naming resource-bearing areas.