Some articles on minerals, valuable minerals:
Mining Equipment - Mining Methods and Procedures - Mining Techniques
... is much more common, and produces, for example, 85% of minerals (excluding petroleum and natural gas) in the United States, including 98% of metallic ores ... divided into two general categories of materials placer deposits, consisting of valuable minerals contained within river gravels, beach sands, and other unconsolidated materials and lode deposits, where ... requires that the rock ore be crushed and pulverized before extraction of the valuable minerals begins ...
... is much more common, and produces, for example, 85% of minerals (excluding petroleum and natural gas) in the United States, including 98% of metallic ores ... divided into two general categories of materials placer deposits, consisting of valuable minerals contained within river gravels, beach sands, and other unconsolidated materials and lode deposits, where ... requires that the rock ore be crushed and pulverized before extraction of the valuable minerals begins ...
Famous quotes containing the word valuable:
“The most durable thing in writing is style, and style is the most valuable investment a writer can make with his time. It pays off slowly, your agent will sneer at it, your publisher will misunderstand it, and it will take people you have never heard of to convince them by slow degrees that the writer who puts his individual mark on the way he writes will always pay off.”
—Raymond Chandler (1888–1959)
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