Extracted valuable materials (like coal, gems, or metals) from underground by digging; or extracted from a large amount of information.
From Old French 'mine', possibly from Celtic sources or a pre-Latin Mediterranean language. Originally meant a mine shaft or excavation. The verb form means to dig or extract from such places.
Medieval miners would take caged birds down into mines—if the bird died, toxic gases were present and miners needed to escape immediately. The canary became the original safety system!
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