Gold Deposit
Gold Deposits Nc
Gold forms in so many ways, and California boasts a number of them. This is why panning for gold in California is such a lucrative endeavor, whether it’s a burning passion or a relaxing hobby. Here are just a few of the ways California gold deposits are formed and exposed for our discovery!
Gold Depositories Locations
- Vents at the bottom of the sea called smokers occur when earthquakes and undersea volcanoes spread open the crust of the Earth itself. Minerals in which gold and other metals are concentrated are spewed into the water, where they meet the cold ocean water and harden into deposits. What’s this matter when we’re on land? Keep in mind that tens of millions of years ago, California was stuck between the Pacific Ocean and the Western Interior Seaway, a sea that took up most of the Great Plains states. This prime location is part of what makes California so rich in gold today.
The gold deposits are a result of mineralization during the Precambrian period. The Homestake ore bodies are associated with banded iron formations and interlayered metavolcanic rocks. The schists of the Homestake Formation have experienced many stages of very tight folds. The ore bodies are central to zones of cross folding. Convergent plate boundaries are the plate tectonic setting of many gold deposits. There, magma produced by the melting of descending lithosphere rises as magma chambers and crystallizes close to the surface. Gold in these hot environments is often dissolved in superheated water and carried away from the magma chamber along faults and fractures.
- Water thick with gold and other metals is heated by magma and forms deposits in volcanoes. Gold ore is formed in the rocks of active volcanoes this way. Now, we can’t climb into an active volcano, but when those volcanoes go dormant or extinct, like much of the Sierra range, those deposits still remain. Given so many of our mountains were once active shield volcanoes, this means that erosion has unearthed their treasures over the millennia they’ve been enjoying retirement.
- A third way gold is formed involves hot springs. When hot rocks heat ground water, fluids from deep in the earth form in these areas. Hot springs with low sulfur fluids offer these kinds of deposits.
- When mountains are pushed up by tectonic plates shoving up against each other, fractures are formed in the crust of the Earth. Superheated fluids rise up into these fractures. As in our other examples, these fluids are metal-rich. When they become trapped or harden, they form quartz veins that bear great amounts of gold. This is how much of the gold is formed in the Sierra range here in California.
Gold Deposits Nj
- Placer deposits are constantly being formed as gold is exposed and swept down waterways. This is what makes rivers and streams in the area such treasure troves for gold. Panning for gold in California can be so lucrative because we’re located at the intersection of so many ways gold is formed. As the mountains and cliffs are exposed over years and years of weathering, more and more of these California gold deposits are exposed and washed into our streams and rivers.