Question: The cave that contained the mummified remains of the Si-Te-Cah tribe was placced on the National Register of Historic Places in what year?

Context articles: Lone Oaks
Samuels' Cave
Historic Preservation Fund
Barney Flat Historic Railroad Logging Landscape
Lovelock Cave
Big Bone Cave
Three Entrance Cave Archeological District
Si-Te-Cah
Bull Thistle Cave Archaeological Site
Bonaparte Historic Riverfront District

Lone Oaks, also known as the Benjamin Deyerle Place and Winsmere, is a Greek Revival mansion listed on both the National Register of Historic Places and the Virginia Landmarks Register in the Greater Deyerle neighborhood of the independent city of Roanoke, Virginia, U.S.A.
 Located at 3402 Grandin Road Extension SW, Lone Oaks was completed in 1850 as the private residence of Benjamin Deyerle overlooking Mudlick Creek.
 Today the home still stands, with the surrounding area now developed as single family home typical of those built during the 1970s-80s.
 Today the home remains as a private residence.
 The house is L-shaped with a single pediment Doric entrance portico, which has plain square pillars and fluted columns.
 It became a Virginia Historic Landmark and was listed on the National Register of Historic Places in 1973.
Samuels' Cave, also known as Brown's Cave, Pictured Cave, or Mystery Cave, is a prehistoric, naturally formed rock shelter located in Barre Mills, Wisconsin.
 The cave has petroglyphs and pictographs from the ancient people who had lived in the area.
 It was listed on the National Register of Historic Places on June 11, 1991.
The National Historic Preservation Act of 1966 (NHPA) envisioned a funding source to provide states with matching funds to implement the Act.
 The Act was to be implemented through partnerships with states, Indian Tribes, Native Hawaiians, local governments, nonprofit organizations, and the private sector.
 It brought forth state programs to implement much of the Act; a National Register of Historic Places encompassing a wide range of sites and structures deemed historic; partnerships at all levels of government; incentives; assistance; and reviews.
 The NHPA endorsed the use of federal financial support for the national preservation program and called for two basic categories of assistance, both of which provide funding, rather than technical assistance, for historic preservation projects and to individuals for the preservation of properties listed in the National Register of Historic Places.
 Since enactment in 1966, repeated efforts to fund the HPF was realized after a 10-year campaign when consistent funding was authorized on September 28, 1976, through Public Law 94-422.
 The law amended the National Historic Preservation Act to establish a funding source known as the Historic Preservation Fund for a historic preservation grant program to provide assistance to non-federal entities.
The Barney Flat Historic Railroad Logging Landscape is the historic remains of railroad logging on the South Kaibab Plateau in the early 20th century.
 Barney Flat is the only stump field on the National Register of Historic Places.
 Barney Flat is located in the Kaibab National Forest, along the Perkinsville Road, south of Williams, Arizona.
 It was added to the National Register of Historic Places on February 24, 1995.
Lovelock Cave (NV-Ch-18) is a North American archaeological site previously known as Sunset Guano Cave, Horseshoe Cave, and Loud Site 18.
 The cave is about 150 feet long and 35 feet wide.
 Lovelock Cave is one of the most important classic sites of the Great Basin region because the conditions of the cave are conducive to the preservation of organic and inorganic material.
 The cave was placed on the National Register of Historic Places on May 24, 1984.
 It was the first major cave in the Great Basin to be excavated, and the Lovelock Cave people are part of the University of California Archaeological Community's Lovelock Cave Station.
(Big) Bone Cave is a cave located in Van Buren County, Tennessee, in the community of Bone Cave that is named after it.
 It is notable both for its history and current recreational use.
 It is listed on the National Register of Historic Places and a designated National Natural Landmark.
 It is a 400 acre State Natural Area managed by Rock Island State Park.
 It is named for the discovery of the bones of a giant ground sloth in 1811.
 The cave was operated as a saltpeter mine, notably during the War of 1812 and the American Civil War.
 A variety of natural remains and human artifacts has been well preserved in the dry atmosphere of the cave.
 The cave is the 10th longest mapped cave in Tennessee.
Three Entrance Cave Archeological District is a 9 acre archeological site in Cimarron County, Oklahoma, near Kenton, that was listed on the National Register of Historic Places in 1978.
 Its specific location is not disclosed by the National Register.
 It includes two contributing sites, at least one being a prehistoric camp location.
 It was listed on the National Register for its potential to yield information in the future.
According to Paiute oral history, the Si-Te-Cah, Saiduka or Sai'i are a legendary tribe whose mummified remains were allegedly discovered under four feet of guano by guano miners in what is now known as Lovelock Cave in Lovelock, Nevada, United States.
 Although the cave had been mined since 1911, miners did not notify authorities until 1912.
 The miners destroyed many of the artifacts, but archaeologists were still able to retrieve 10,000 Paiute artifacts from the cave.
 Items included tule duck decoys, sandals, and baskets, several dating back over 2000 years.
The Bull Thistle Cave Archaeological Site is an archaeological site on the National Register of Historic Places, located in Tazewell County, Virginia.
 It is a vertical shaft pit burial cave.
 The distribution of the skeletal remains indicates that bodies were either thrown or lowered into the cave.
 On the surface of the cave floor, researchers have discovered the remains of a minimum of 11 bodies.
 Based on an artifact recovered from the site, it is estimated that the cave was used for burials between 1300 and 1600 AD.
The Bonaparte Historic Riverfront District is a nationally recognized historic district located in Bonaparte, Iowa, United States.
 It was listed on the National Register of Historic Places in 1989.
 At the time of its nomination it contained 38 resources, which included 24 contributing buildings, one contributing structure, 11 non-contributing buildings, and two non-contributing structures.
 Three mill-related buildings near the Des Moines River are associated with the Meek's family who had a central role in the town's development from its founding through the turn of the 20th-century.
 They include the woolen mill (1863), the flour mill (1878), which is individually listed on the National Register, and the pants factory (1892).
 Eighteen commercial buildings are of brick construction.
 Of those, eight are two-story structures, and ten are single-story structures.
 The remaining three buildings are wood frame commercial buildings.
 The single historic structure is the stone lock in the city park, which is also individually listed on the National Register.