Mariposa County is a county located in the U.S. state of California. As of the 2020 U.S. Census, the population was 17,131. The county seat is Mariposa. It is located in the western foothills of the Sierra Nevada mountains, north of Fresno, east of Merced, and southeast of Stockton.
Mariposa is an unincorporated community and census-designated place (CDP) in and the county seat of Mariposa County, California, United States. The population was 1,526 at the 2020 census. The community is named after the flocks of monarch butterflies seen overwintering there by early explorers.
Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments. Jade is often referred to by either of two different silicate mineral names: nephrite, or jadeite. Nephrite is typically green, although may be yellow, white or black. Jadeite varies from white or near-colorless, through various shades of green, to lavender, yellow, orange, brown and black. Rarely it may be blue. Both of these names refer to their use as gemstones, and each has a mineralogically more specific name. Both the amphibole jade (nephrite) and pyroxene jade are mineral aggregates (rocks) rather than mineral species. Nephrite was deprecated by the International Mineralogical Association as a mineral species name in 1978. The name "nephrite" is mineralogically correct for referring to the rock. Jadeite, is a legitimate mineral species, differing from the pyroxene jade rock. In China, the name jadeite has been replaced with fei cui, the traditional Chinese name for this gem that was in use long before Damour created the name in 1863.
Placer mining is the mining of stream bed deposits for minerals. This may be done by open-pit mining or by various surface excavating equipment or tunneling equipment.
The Gold Country is a historic region in the northern portion of the U.S. state of California, that is primarily on the western slope of the Sierra Nevada. It is famed for the mineral deposits and gold mines that attracted waves of immigrants, known as the 49ers, during the 1849 California Gold Rush.
Keweenaw National Historical Park is a unit of the U.S. National Park Service. Established in 1992, the park celebrates the life and history of the Keweenaw Peninsula in the Upper Peninsula of the U.S. state of Michigan. It is a federal-local cooperative park made up of two primary units, the Calumet Unit and the Quincy Unit, and almost two dozen cooperating "Heritage Sites" located on federal, state, and privately owned land in and around the Keweenaw Peninsula. The National Park Service owns approximately 1,700 acres (690 ha) in the Calumet and Quincy Units. Units are located in Baraga, Houghton, Keweenaw, and Ontonagon counties.
Empire Mine State Historic Park is a state-protected mine and park in the Sierra Nevada mountains in Grass Valley, California, U.S. The Empire Mine is on the National Register of Historic Places, a federal Historic District, and a California Historical Landmark. Since 1975 California State Parks has administered and maintained the mine as a historic site. The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California". Between 1850 and its closure in 1956, the Empire Mine produced 5.8 million ounces of gold, extracted from 367 miles (591 km) of underground passages.
New Almaden, known in Spanish as Nueva Almadén, is a historic community and former mercury mine in the Capitancillos Hills of San Jose, California, located at the southwestern point of Almaden Valley in South San Jose. New Almaden is divided into two parts: the mines and much of their immediate surroundings, including historic ghost town settlements in the Capintancillas, which together form the Almaden Quicksilver County Park, and the largely residential historic district surrounding the Casa Grande.
The Santa Cruz Museum of Natural History, also known affectionately by locals as "the Whale Museum", is one of the earliest museums in the state of California. Founded from the Laura Hecox collection in 1905, the museum's collections grew extensively throughout the years, acquiring many Native American and archaeological artifacts, as well as natural history specimens. Currently, the museum is housed in a Carnegie Library, named after the Carnegie philanthropic foundation that funded the construction of the library in 1915.
Jerome State Historic Park is a state park of Arizona, US, featuring the Douglas Mansion, built in 1916 by a family of influential mining entrepreneurs in Jerome, Arizona, a mining region in the northeast of the Black Hills, east Yavapai County. A museum is located in the old Douglas Mansion.
The Leadville mining district, located in the Colorado Mineral Belt, was the most productive silver-mining district in the state of Colorado and hosts one of the largest lead-zinc-silver deposits in the world. Oro City, an early Colorado gold placer mining town located about a mile east of Leadville in California Gulch, was the location to one of the richest placer gold strikes in Colorado, with estimated gold production of 120,000–150,000 ozt, worth $2.5 to $3 million at the then-price of $20.67 per troy ounce.
The Burra Burra Mine is a copper mine located in Ducktown, Tennessee, in the southeastern United States. Named for the famous mine in Australia, the Burra Burra Mine is located in the Copper Basin geological region, and extracted over 15 million tons of copper ore during its 60 years of operation between 1899 and 1959. The mine's remaining structures are listed on the National Register of Historic Places as part of the Burra Burra Mine Historic District. The site is also home to the Ducktown Basin Museum, and the museum and mine are a Tennessee State Historic Site operated in partnership with the Tennessee Historical Commission.
Ironstone’s Crown Jewel is the world’s largest piece of crystalline gold. At 44 lbs troy (16.4 kg), it is substantially larger than the Fricot "Nugget" and the Whopper, the next two largest specimens.
The New Jersey State Museum is located at 195-205 West State Street in Trenton, in the U.S. state of New Jersey. The museum's collections include natural history specimens, archaeological and ethnographic artifacts, and cultural history and fine art objects. Exhibitions, educational activities, research programs, and lectures are also offered. The museum, a division of the New Jersey Department of State, includes a 140-seat planetarium and a 384-seat auditorium.
The Rice Northwest Museum of Rocks and Minerals is a non-profit museum in Hillsboro, Oregon, United States. Located just north of the Sunset Highway on the northern edge of Hillsboro, the earth science museum is in the Portland metropolitan area. Opened in 1997, the museum's collections date to the 1930s with the museum housed in a home built to display the rock and mineral collections of the museum founders. The ranch-style home is listed on the National Register of Historic Places, the first of its kind listed in Oregon. In 2015 the museum became a Smithsonian Affiliate museum.
The Mines Museum of Earth Science, formerly the Colorado School of Mines Geology Museum, is a geology museum located on the campus of the Colorado School of Mines, in Golden, Colorado, United States. It was established in 1877 by paleontologist and Mines' professor, Arthur Lakes. The first place to house the museum's collection was Jarvis Hall, which burnt down in 1878. While the museum awaited a new home, the collection continued to grow. Horace Patton was named Curator of the collection, still used primarily for teaching, in 1893. The collection was relocated to Guggenheim Hall in 1906, but upon Patton's retirement, the collection was relegated to storage. In 1940, upon completion of Berthoud Hall, home to Mines' geology department, the collection was unpacked by its newest Curator, J. Harlan Johnson and informally exhibited there until 2002.
The Arizona Mining and Mineral Museum in Phoenix, Arizona, was a museum focused on minerals and mining. Last operated by the Arizona Historical Society, a state government agency, its exhibits included more than 3,000 minerals, rocks, fossils, and artifacts related to the mining industry. The museum closed in May 2011. In April 2017, legislation was passed to reopen the museum under the ownership of the University of Arizona.
Yogo sapphires are blue sapphires, a colored variety of corundum, found in Montana, primarily in Yogo Gulch in Judith Basin County, Montana. Yogo sapphires are typically cornflower blue, a result of trace amounts of iron and titanium. They have high uniform clarity and maintain their brilliance under artificial light. Because Yogo sapphires occur within a vertically dipping resistive igneous dike, mining efforts have been sporadic and rarely profitable. It is estimated that at least 28 million carats of Yogo sapphires are still in the ground. Jewelry containing Yogo sapphires was given to First Ladies Florence Harding and Bess Truman; in addition, many gems were sold in Europe, though promoters' claims that Yogo sapphires are in the crown jewels of England or the engagement ring of Princess Diana are dubious. Today, several Yogo sapphires are part of the Smithsonian Institution's gem collection.
Stockton Creek is a tributary of Mariposa Creek in Mariposa County, California. It was named after Robert F. Stockton who owned a mine and stamp mill during the California Gold Rush. An impoundment on the creek owned by the Mariposa Public Utilities Commission holds a major source of water for the community of Mariposa.
The Fricot Nugget is a crystalline gold nugget found in El Dorado County, California in 1865 during the California Gold Rush by William Russell Davis. It is listed as the eleventh largest gold nugget ever found, and is the second largest gold nugget found in the United States of America. At 201 troy ounces, it is the largest surviving single piece of gold from the California Gold Rush.
