CICERO, Ind. (Hamilton County Reporter) — Dean Caldwell of Cicero has been mining opal and obsidian for six months of the year in Mexico for the last 15 years. Last year, he pulled an opal out of the ...
Explore the world’s rarest gemstones and discover how rarity shapes their investment value, cultural legacy, and appeal among ...
Along certain parts of the ocean floor lies a bounty of rare minerals and metals, critical components for batteries, electric cars and other electronics. But mining for them in the deep sea is a ...
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