Salt, coal, copper, nickel
One of the things mined for in Poland is salt. The world's largest salt mine is located in Poland. It is so big that it has a hotel, hospital, a church, and other things. It has been mined for centuries.
mined (like mined for diamonds)
how is malachite mined
Mined.
where is boron mined at
Yes, uranium is mined in Australia it is mined in South Australia
Yes, diamonds are mined.
The earth is mined to get diamonds.
Lead and silver were mined at Leadhills and, for a time, gold was also mined there.
where and how iron is mined
Yes, minerals of magnesium are mined.
The homophone for "mind" is "mined."