Chapter 2, Section 3 Mineral Resources Wednesday, November 4, 2009 Pages Wednesday, November 4, 2009 Pages
Objectives Describe how minerals are used. List the three types of mines. Explain how ores are processed to obtain metals. Describe how minerals are used. List the three types of mines. Explain how ores are processed to obtain metals.
Vocabulary Words Gemstone Ore Smelting Alloy Gemstone Ore Smelting Alloy
Uses of Minerals Minerals are the source of metals, gemstones, and other materials used to make many products.
Gemstones Gemstones are hard, colorful minerals. Gemstones have a brilliant or glassy luster. Gemstones are valued for their color. Gemstones are called gems once they are cut and polished. Gemstones are used mainly for jewelry and decoration.
Metals Minerals are sources of metals such as aluminum, iron, copper, or silver. Metals are used to make tools and machinery. Metals all begin as minerals inside Earth’s crust.
Other Uses of Mineral Talc -- baby powder Quartz -- glass; timepieces Calcite -- optical equipment. Kaolin -- china Gypsum -- cement Corundum -- polishing and cleaning products
Ores An ore is a rock that contains a metal or economically useful mineral. Most metals do not occur in pure form. Gold ore
Prospecting People who look for an ore deposit are called prospectors. They observe the land surfaces. They examine surrounding plants. They look at results of sound waves.
Mining There are three types of mine: Strip mines Open pit mines Shaft mines There are three types of mine: Strip mines Open pit mines Shaft mines
Strip Mining Earthmoving equipment scrapes away soil to expose ores.
Open Pit Mining Giant earthmoving equipment is used to dig a tremendous pit. Pits can extend 100’s of meters below the surface. Giant earthmoving equipment is used to dig a tremendous pit. Pits can extend 100’s of meters below the surface.
Shaft Mines Shaft mines have a network of tunnels. They follow veins of the ore. Shaft mines have a network of tunnels. They follow veins of the ore.
Smelting Smelting is the process where ore is melted to separate the useful metal from other elements that ore contains. Involves mixing an ore with other substances and then heating the mixture to a very high temperature. The heat causes the metal to separate from the oxygen with which it is combined. After smelting, an addition process is added to remove impurities. Smelting is the process where ore is melted to separate the useful metal from other elements that ore contains. Involves mixing an ore with other substances and then heating the mixture to a very high temperature. The heat causes the metal to separate from the oxygen with which it is combined. After smelting, an addition process is added to remove impurities.
Homework Workbook Section 2.3 due 11/6 Vocabulary quiz 2.3 only on 11/6 CHAPTER 2 TEST RESCHEDULED -- NEW DATE: 11/11. Workbook Section 2.3 due 11/6 Vocabulary quiz 2.3 only on 11/6 CHAPTER 2 TEST RESCHEDULED -- NEW DATE: 11/11.