From circuit boards, monitors, stereo cables, or fashion jewelry; precious metals can make you a lot of money when you scrap for cash.
The common precious metals are gold, silver, and palladium. There are also other metals that are considered to be precious.
Indium: A rare metal produced from zinc-ore processing and other ores such as copper, lead, and iron. This metal is used in electronic semi-conductors, flat panel displays, corrosive resistant mirrors as well as other manufactured products.
Silver: You are most likely familiar with silver as used in jewelry and dental caps but it has a wide variety of other uses as well. Silver is used in xrays, photography, coinage, circuitry, and can also be used to stop the spreading of bacteria. So you can see how diverse and valuable this metal can be.
Rhenium: Discovered in 1925 rhenium is used in high temperature turbine engines and other high temperature applications where heat needs to be controlled. Rhenium is a by-product of molybdenum, a by-product of copper mining.
Palladium: This metal has excellent conductivity traits and therefore can be found in use in the manufacturing of electrical and electronic devices. It is often used to plate over other metals. The automotive industry uses this metal in catalytic converters to reduce emissions. The jewelry makers use it to create a white gold alloy.
Osmium: Bluish silver in color Osmium is one of the densest metals on earth. This metal has an extremely high melting point. You will find this metal used in high temperature applications such as electrical filaments, switches, and contacts. When melting osmium can emit a toxic oxide which can hare the eyes and lungs.
Iridium: Most famous for the metal found at the K-T boundary. The K-T boundary is the point were earth changes from the Mesozoic to the Cenozoic era. It's believed that a large asteroid slammed into the Yucatan peninsula over 65 million years ago and caused the dinosaurs to go extinct. The properties of Iridium are it is very dense, has a high melting point, and is very corrosion resistant.
Ruthenium: This metal is bright gray in color. Ruthenium exhibits many of the same properties as other metals in the platinum-group of metals such as hardness and high melting points. Ruthenium is often used as an alloy to give hardness to softer metals in the jewelry industry. This metal also has good corrosive resistantly.
Gold: Throughout the ages gold has been the standard for what is to be considered a precious metal. The Myan's, Egyptians, and California prospectors all had gold fever. Gold has been the standard to back fiat currencies, and as highly prized natural resource. The properties of gold are that it is malleable, durable, and has demonstrated of many thousands of years it's long standing value to all cultures on Earth.
Platinum: This highly prized silvery metal is highly valued. Jewelry makers have for many years been cashing in on the dazzling look of platinum. The aeronautics and weapons industries have found great uses for this metal. Properties such as it's malleability, non-corrosive properties, and the ability to withstand large quantities of hydrogen make it diverse in it's uses.
Rhodium: Properties like a high melting point, shine, highly reflective, and the ability to withstand corrosion makes it ideal for jewelry and scientific applications. Often used as a reflective surface for higher quality mirrors, search lights, and as a jewelers metal the average cost per troy ounce has been traditionally more than any other metal talked about today.