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Geology Terms – Resource Opportunities

Porphyry Deposits Every investor in the mining industry has heard about porphyry deposits, yet few understand the significance of the term. Porphyry deposits are often enormous in size, representing the most important source of copper and one of the leading sources of gold.

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News - USGS.gov | Science for a changing world

News Dive into the world of science! Read these stories and narratives to learn about news items, hot topics, expeditions underway, and much more.

A History of the United States Steel Industry - Rodney Ohebsion

The Romance of Steel A History of the Steel Industry by Herbert Newton Casson THE BIRTH OF THE BESSEMER PROCESS. On that bleak November day when Andrew Carnegie was born in a Scottish cottage, the iron and steel makers of America had no more thought of millions than of castles in Spain.

Mining - Wikipedia

Mining in the Philippines began around 1000 BC. The early Filipinos worked various mines of gold, silver, copper and iron. Jewels, gold ingots, chains, calombigas and earrings were handed down from antiquity and inherited from their ancestors.

How lead is made - material, used, processing, product ...

drossing kettle at a temperature just above its melting point, about 626°F (330°C). At this temperature, any copper left in the bullion rises to the top of the kettle and forms a scum or dross which can be skimmed off.

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