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How do mineral ores occur?

List the formations in which mineral ores occur.

Answers

Maurice
Formations in Which Minerals Occur

1. Veins and Lodes.

Occurrence of minerals in crevices, cracks or faults in igneous rocks.
- They are said to occur in veins if they occur there in small quantities.
- Said to occur in lodes if they occur there in large quantities e.g. zinc, copper and silver.

2. Reefs
-Veins and lodes which are exposed on the surface.

3. Seams/Layers/Beds
-Occurrence of minerals as sedimentary or as a result of compression of accumulated organic or inorganic material e.g. coal and halite.

4. Alluvial Deposits
-Occurrence of minerals while mixed with materials such as sand, gravel, silt, etc.
These were minerals which were detached from the veins by weathering and carried away by streams and rivers and got deposited e.g. gold, diamond and platinum.

5. Weathering Products
-Minerals formed by deep weathering of rocks then leaching carried minerals from the top to lower layers where they accumulated e.g. aluminium, nickel, iron and manganese.

6. Oil pools/Wells
-Occurrence of minerals in pools or wells in sedimentary rocks e.g. petroleum and natural gas.
maurice.mutuku answered the question on June 10, 2017 at 12:42

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