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Detailed description, properties, and locality information guide about the mineral spinel: including ruby spinel, gahnite, galaxite, and hercynite.
The following outline is provided as an overview of and topical guide to mining: Mining – extraction of valuable minerals or other geological materials from the ...
Rwanda is a rural country with about 90% of the population engaged in (mainly subsistence) agriculture. It is the most densely populated country in Africa; is ...
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