Placerville is a

census-designated place A census-designated place (CDP) is a Place (United States Census Bureau), concentration of population defined by the United States Census Bureau for statistical purposes only. CDPs have been used in each decennial census since 1980 as the counte ...

(CDP) and

post office A post office is a public facility and a retailer that provides mail services, such as accepting letter (message), letters and parcel (package), parcels, providing post office boxes, and selling postage stamps, packaging, and stationery. Post o ...

in and governed by San Miguel County,

Colorado Colorado is a U.S. state, state in the Western United States. It is one of the Mountain states, sharing the Four Corners region with Arizona, New Mexico, and Utah. It is also bordered by Wyoming to the north, Nebraska to the northeast, Kansas ...

, United States. The Placerville post office has the ZIP Code 81430 (

post office box A post office box (commonly abbreviated as P.O. box, or also known as a postal box) is a uniquely addressable lockable box located on the premises of a post office. In some regions, particularly in Africa, there is no door-to-door delivery ...

es). At the United States Census 2020, the population of the Placerville CDP was 362.

History

Placerville was originally established as a small mining camp, named after the placer

gold Gold is a chemical element; it has chemical symbol Au (from Latin ) and atomic number 79. In its pure form, it is a brightness, bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal ...

mines located on the San Miguel River and Leopard Creek. The location became known as Old Placerville after the

Rio Grande Southern Railroad The Rio Grande Southern Railroad (reporting mark RGS, also referred to as "The Southern") was a 3 ft gauge railways, 3 ft (914 mm) Narrow gauge railways, narrow-gauge railroad which ran in the southwestern region of the United States, US s ...

constructed a depot and several passing sidings west of the original settlement, calling it Placerville. A. B. Frenzel discovered

vanadium Vanadium is a chemical element; it has Symbol (chemistry), symbol V and atomic number 23. It is a hard, silvery-grey, malleable transition metal. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an ...

-bearing sandstone near Placerville in the late 1890s. The ore was in strataform bodies in the

Entrada Sandstone The Entrada Sandstone is a formation (geology), formation in the San Rafael Group found in the U.S. states of Wyoming, Colorado, northwest New Mexico, northeast Arizona, and southeast Utah. Part of the Colorado Plateau, this formation was deposi ...

(

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...

) east of the town. The principal mineral was

roscoelite Roscoelite is a green mineral from the mica group that contains vanadium. The chemical formula is potassium, K(vanadium, V3+, aluminium, Al, magnesium, Mg)2aluminum, Alsilicon, Si3oxygen, O10(Ohydrogen, H)2. Crystals of roscoelite take on the mono ...

, with minor montroseite and

carnotite Carnotite is a potassium uranium vanadate radioactive mineral with chemical formula K2( U O2)2( VO4)2·3 H2O. The water content can vary and small amounts of calcium, barium, magnesium, iron, and sodium are often present. Occurrence Carnotite ...

. By the fall of 1899, development was described as "of the most superficial character," although Frenzel had driven one tunnel 18 feet into the rock. By 1901-1902, Frenzel was excavating several thousand tons intended for shipment to

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

. Most of the Placerville ore was less than 3% vanadium, too low grade to pay for shipment to Europe, so in 1905 the Vanadium Alloys Co. built an ore-processing mill southeast of Placerville to recover the metal as ferro-vanadium, which it sold. At least five mines were active at one time, and by 1919 the two ore mills at Placerville were producing 30% of the world's vanadium. Through 1940, the mines produced about 3.7 million pounds of vanadium. The Placerville Schoolhouse, a

one-room schoolhouse One-room schoolhouses, or One-room schools, have been commonplace throughout rural portions of various countries, including Prussia, Norway, Sweden, the United States, Canada, Australia, New Zealand, the United Kingdom, Ireland, Portugal, and Spa ...

, operated from 1908 to 1960. In 1909, the failure of the Trout Lake Dam caused the flooding of Placerville as well as

Sawpit A saw pit or sawpit is a pit over which timber is positioned to be sawed with a long two-handled saw, usually a whipsaw, by two people, one standing above the timber and the other below. It was used for producing sawn planks from tree trunks, wh ...

and Newmire. Although

was recognized as a minor constituent of the ore since its discovery, the amount was small, and no assays were made of the uranium content of the ore until World War II. Beginning about 1950, the small uranium content of the ore was also recovered from the ore.

Geography

The Placerville CDP has an area of , all land.

Climate

According to the

Köppen Climate Classification The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (te ...

system, Placerville has a

warm-summer humid continental climate A humid continental climate is a climatic region defined by Russo-German climatologist Wladimir Köppen in 1900, typified by four distinct seasons and large seasonal temperature differences, with warm to hot (and often humid) summers, and cold ...

, abbreviated "Dfb" on climate maps. The hottest temperature recorded in Placerville was on July 23, 2020 and June 12–13, 2021, while the coldest temperature recorded was on February 2, 2011 and January 15, 2013.

Demographics

The

United States Census Bureau The United States Census Bureau, officially the Bureau of the Census, is a principal agency of the Federal statistical system, U.S. federal statistical system, responsible for producing data about the American people and American economy, econ ...

defined the for the

Transportation

Placerville is part of Colorado's

Bustang Bustang is an intercity bus service in the U.S. state of Colorado. Service began in 2015 and originally traveled between Denver and Colorado Springs, Fort Collins, and Glenwood Springs. Service has since been expanded to connect Grand Junction ...

network. It is on the Durango-Grand Junction Outrider line.

References

External links

Placerville WesternMiningHistory.com

{{authority control Unincorporated communities in San Miguel County, Colorado Unincorporated communities in Colorado Census-designated places in Colorado