Hillsboro is a small unincorporated community in Sierra County, New
Mexico, United States, located in the southwestern part of the state.
It was founded in 1877, following the discovery of gold. The community
was the county seat of Sierra County from 1884 until 1936 when Hot
Springs (now called Truth or Consequences) became the county seat.The
town was named Hillsborough by the prospectors in Dec. 1877, but later
shortened to Hillsboro. By 1880 the town had 4 companies of soldiers
and 400 miners, but the population soon grew to 700. A county
courthouse was built in 1892. By 1907 the population was 1200. A flood
on 10 June 1914 caused considerable damage to many town buildings.The
first house was built in August 1877 after two prospectors, Dan Dugan
and Dave Stitzel, working in the area of the future Opportunity Mine,
collected loose pieces of rock (float is the geologic term) assayed at
$160 per ton in gold and silver. Soon, ore was discovered at the
nearby Rattlesnake vein (geology) by Dugan and Frank Pitcher, and a
placer deposit of gold was found in November at the Rattlesnake and
Wicks gulches. Ore was pulverized with arrastres located in Hillsboro,
including a 10-stamp mill built in 1878. Total production prior to
1904 was about $6,750,000. Between 1911 and 1931, total production of
gold ore was 836 tons, gold-copper-silver ore was 5,470 tons, and
copper ore was 200 tons. In his report, Harley wrote, "The ore
deposits of the Hillsboro or Las Animas mining district are of four
general types as follows: (1) fissure veins in andesite flows, (2)
disseminated deposits in monzonite porphyry, (3) replacement deposits
in limestone, and (4) placer gold deposits."The Copper Flat volcano to
the northeast of Hillsboro is the source of the gold in the area. The
4 mile wide volcano is characterized by a Cretaceous quartz monzonite
stock within a topographic depression, surrounded by surface andesite
flows at least 2,300 feet thick, and radial quartz latite or rhyolite
dikes. The stock generated the porphyry copper deposits, gold-bearing
veins, and gold placers. There are about 26 major veins forming a
radial pattern from the stock. The Golddust Camp placer deposits are
found in the alluvium of the dry gulches radiating off Copper Flat and
the andesite flows. The fissure veins produced 51,000 ounces of gold,
while the placer deposits produced 110,000 ounces. Hillsboro, New Mexico Biography, NetWorth, Height, Age, Weight, Family, Married, Son, Daughter