What is white gold?
White gold was originally developed to imitate platinum (a naturally white metal). White gold is usually an alloy containing about 75% gold and about 25% nickel and zinc. If stamped 18 karat, it would be 75% pure gold.
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Alkalic-type epithermal gold deposit model; Chapter R in Mineral deposit models for resource assessment
This report summarizes the primary characteristics of alkalic-type epithermal gold (Au) deposits and provides an updated descriptive model. These deposits, primarily of Mesozoic to Neogene age, are among the largest epithermal gold deposits in the world. Considered a subset of low-sulfidation epithermal deposits, they are spatially and genetically...
Kelley, Karen D.; Spry, Paul G.; McLemore, Virginia T.; Fey, David L.; Anderson, Eric D.
Platinum-group elements
The platinum-group elements (PGEs)—platinum, palladium, rhodium, ruthenium, iridium, and osmium—are metals that have similar physical and chemical properties and tend to occur together in nature. PGEs are indispensable to many industrial applications but are mined in only a few places. The availability and accessibility of PGEs could be disrupted...
Schulz, Klaus J.; DeYoung,, John H.; Seal, Robert R.; Bradley, Dwight C.; Zientek, Michael L.; Loferski, Patricia J.; Parks, Heather L.; Schulte, Ruth F.; Seal, Robert R.
A world of minerals in your mobile device
Mobile phones and other high-technology communications devices could not exist without mineral commodities. More than one-half of all components in a mobile device—including its electronics, display, battery, speakers, and more—are made from mined and semiprocessed materials (mineral commodities). Some mineral commodities can be recovered as...
Jenness, Jane E.; Ober, Joyce A.; Wilkins, Aleeza M.; Gambogi, Joseph
Nickel: makes stainless steel strong
Nickel is a silvery-white metal that is used mainly to make stainless steel and other alloys stronger and better able to withstand extreme temperatures and corrosive environments. Nickel was first identified as a unique element in 1751 by Baron Axel Fredrik Cronstedt, a Swedish mineralogist and chemist. He originally called the element...
Boland, Maeve A.
Zinc-The key to preventing corrosion
Centuries before it was identified as an element, zinc was used to make brass (an alloy of zinc and copper) and for medicinal purposes. Metallic zinc and zinc oxide were produced in India sometime between the 11th and 14th centuries and in China in the 17th century, although the discovery of pure metallic zinc is credited to the German chemist...
Kropschot, S.J.; Doebrich, Jeff L.
The life cycle of a mineral deposit: a teacher's guide for hands-on mineral education activities
This teacher's guide defines what a mineral deposit is and how a mineral deposit is identified and measured, how the mineral resources are extracted, and how the mining site is reclaimed; how minerals and mineral resources are processed; and how we use mineral resources in our every day lives. Included are 10 activitybased learning exercises that...
Frank, Dave; Galloway, John; Assmus, Ken
Gold recycling in the United States in 1998
In 1998, 175 metric tons (t) of refined gold was recovered by U.S. refiners from old and new scrap. The overall recycling rate was 29 percent when scrap consumption was compared with apparent domestic supply. Sources of old scrap includes discarded jewelry, dental materials, plating solutions, and electronic equipment. A very high old scrap...
Amey, Earle B. Gold
Through the ages, men and women have cherished gold, and many have had a compelling desire to amass great quantities of it -- so compelling a desire, in fact, that the frantic need to seek and hoard gold has been aptly named "gold fever." Gold was among the first metals to be mined because it commonly occurs in its native form -- that is, not...
Kirkemo, Harold; Newman, William L.; Ashley, Roger P.
Rivers of gold; placer mining in Alaska
Yeend, Warren E.; Stauffer, Peter H.; Hendley, James W.
Undiscovered deposits of gold, silver, copper, lead, and zinc in the conterminous United States
McCammon, Richard B.
Prospecting for gold in the United States
Prospecting for gold is something that probably everyone dreams of trying at least once. To the person who is mainly concerned with this activity as a vacation diversion, prospecting offers a special excitement. There is a constant hope that the next pan of sediment may be "pay dirt," and no other thrill can compare with that experienced when one...
Digital Gold Rush Depends on Traditional Gold
In 1849, the discovery of gold in California sparked one of the most famous gold rushes in history. Thousands trekked across mountainous terrain to seek the precious metal, with entire industries springing up around the rush. In fact, the desire to understand our mineral resource wealth that led to the creation of the U.S. Geological Survey was in part fueled by gold rushes like this one.
EarthWord–Placer
Whether you pan for gold or rare earths, you’ll get a lot of sand...and this EarthWord!
The Top 5 Mineral-Producing States
In 2016, these five states led the pack in mineral production, accounting for about one third of the total mineral production value for the entire country.
The Top 5 U.S. Minerals by Production Value
In 2016, the United States mined $74.6 billion worth of minerals, and the following five mineral commodities accounted for 68.5 percent of that value.
EarthWord–Rock vs. Mineral
Ever wondered what the difference between a rock and a mineral was? This EarthWord should cover it...
The Golden Rule on April Fools
Think you know which mineral Fool’s Gold is? You might be fooled...
EarthWord - Mother Lode
Happy Mother's Day from EarthWords!
EarthWord – Ore
The naturally occurring material from which a mineral or minerals of economic value can be extracted. Usually minerals, especially metals, are mined first in ore form, then refined later.
USGS Scientists Study Effects of Gold King Mine Release
On August 5, while investigating the Gold King Mine in southwestern Colorado, the U.S Environmental Protection Agency accidentally triggered the release of approximately three million gallons of acidic, metal-rich mine wastewater from the Gold King Mine into Cement Creek, a tributary of the Animas River.
2017 Oct. Public Lecture — Global Trends in Mineral Commodity Supplies
- The U.S. is increasingly reliant on supply of mineral raw materials from other countries.
- Advanced technologies are increasingly making use of nearly the entire periodic table of the elements.
- Dynamic studies of critical and strategic mineral supply and demand can identify emerging potential supply risks.
- The USGS - National Minerals
Chalcopyrite, Pentlandite, and Pyrrhotite
Mineral: Chalcopyrite, Pentlandite, Pyrrhotite
Mineral Origin: Creighton Mine, Sudbury, Ontario, Canada (Sample on loan from George J. Coakley)
Primary Commodity: Copper and nickel
Primary Commodity Uses: Copper is used primarily in electronics, mostly in building construction and industrial
Sphalerite
Sphalerite, zinc sulfide, is and has been the principal ore mineral in the world. Zinc uses range from metal products to rubber and medicines. Zinc alloys readily with other metals and is chemically active. On exposure to air, it develops a thin gray oxide film (patina), which inhibits deeper oxidation (corrosion) of the metal. The metal’s resistance to corrosion is an
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Native Gold
A sample of native gold. Gold has been treasured since ancient times for its beauty and permanence. Most of the gold that is fabricated today goes into the manufacture of jewelry, but it also performs critical functions in computers, communications equipment, spacecraft, jet aircraft engines, and a host of other products. Read more about gold
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Gold Veins
Gold-bearing quartz veins from the Blue Ribbon Mine, Alaska. Credit: AlaskaMining at English Wikipedia, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=44555449
The Gold Rush and the 1906 Earthquake
The Gold Rush and the 1906 Earthquake: How they combined to create the breakthrough discovery of modern seismic science
- Accidents of Gold Rush merchant marine navigation transformed a seismic disaster into a seminal discovery and led to San Francisco's extreme liquefaction vulnerability today.
- Just about everything that we love about the Bay area is
Why Do Minerals Matter?
You might be surprised where minerals pop up; they're just about everywhere. We sit down with Kathleen Johnson, USGS Mineral Resources Program Coordinator, as she walks us through just how valuable minerals are to our lives.
Gold Pans and Placer Gold
Gold Pans and Placer Gold - image by Max Flanery, California Geological Survey.
Rare Platinum Nugget
Rare platinum nugget NMNH 73738 from the National Mineral Collection. Photo by Chip Clark, Smithsonian Institution. PGEs are essential for manufacturing computers, TVs, cell phones, and other portable electronic devices. They are found in hard drives, circuitry, and automobiles.
Platinum Nugget
PGEs: The platinum-group elements (PGE) include platinum, palladium, rhodium, ruthenium, iridium, and osmium. Although platinum is well known for its use as jewelry and as an investment commodity, the major applications of PGE are industrial because these elements have high melting points, corrosion resistance, and catalytic qualities. Their leading
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