Question

What do you mean by open-cast mining?? ​

Answer 1

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ᴏᴘᴇɴ-ᴘɪᴛ ᴍɪɴɪɴɢ, ᴀʟsᴏ ᴋɴᴏᴡɴ ᴀs ᴏᴘᴇɴ-ᴄᴀsᴛ ᴏʀ ᴏᴘᴇɴ ᴄᴜᴛ ᴍɪɴɪɴɢ, ɪs ᴀ sᴜʀғᴀᴄᴇ ᴍɪɴɪɴɢ ᴛᴇᴄʜɴɪϙᴜᴇ ᴏғ ᴇxᴛʀᴀᴄᴛɪɴɢ ʀᴏᴄᴋ ᴏʀ ᴍɪɴᴇʀᴀʟs ғʀᴏᴍ ᴛʜᴇ ᴇᴀʀᴛʜ ʙʏ ᴛʜᴇɪʀ ʀᴇᴍᴏᴠᴀʟ ғʀᴏᴍ ᴀɴ ᴏᴘᴇɴ-ᴀɪʀ ᴘɪᴛ, sᴏᴍᴇᴛɪᴍᴇs ᴋɴᴏᴡɴ ᴀs ᴀ ʙᴏʀʀᴏᴡ.ᴏᴘᴇɴ-ᴘɪᴛ ᴍɪɴᴇs ᴀʀᴇ ᴜsᴇᴅ ᴡʜᴇɴ ᴅᴇᴘᴏsɪᴛs ᴏғ ᴄᴏᴍᴍᴇʀᴄɪᴀʟʟʏ ᴜsᴇғᴜʟ ᴏʀᴇ ᴏʀ ʀᴏᴄᴋs ᴀʀᴇ ғᴏᴜɴᴅ ɴᴇᴀʀ ᴛʜᴇ sᴜʀғᴀᴄᴇ.

Answer 2

Answer:

Open-pit mining, also known as open-cast or open cut mining, is a surface mining technique of extracting rock or minerals from the earth by their removal from an open-air pit, sometimes known as a borrow. ... Open-pit mines are used when deposits of commercially useful ore or rocks are found near the surface.

Explanation:

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