Jisho

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ろてんぼ 露天掘り
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Noun
1. surface mining; open-cut mining; open-pit mining​See also 坑内掘り
Wikipedia definition
2. Open-pit mining​Open-pit mining or Opencast mining refers to a method of extracting rock or minerals from the earth by their removal from an open pit or borrow. The term is used to differentiate this form of mining from extractive methods that require tunneling into the earth such as long wall mining.
Read “Open-pit mining” on English Wikipedia
Read “露天掘り” on Japanese Wikipedia
Read “Open-pit mining” on DBpedia
Other forms
露天掘 【ろてんぼり】
Notes
露天掘: Irregular okurigana usage.

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