Question: What is the age of these mountains that start in the northeast corner of Georgia and had the Georgia Gold Rush spread throughout it in 1829?

full_context: Document 1: Dahlonega Gold Museum Historic Site: The Dahlonega Gold Museum Historic Site is a Georgia state historic site located in Dahlonega that commemorates America's first gold rush and the mining history of Lumpkin County. The museum is housed in the historic Old Lumpkin County Courthouse built in 1836 and located in the center of the town square. It is the oldest surviving county courthouse in the state. The museum houses many artifacts from the gold rush of 1836, including gold nuggets, gold coins, and gold panning equipment, as well as an educational film and gift shop.
Document 2: Calhoun Mine: The Calhoun Mine is perhaps the oldest and best-known mine in Lumpkin County, Georgia. When gold was discovered in Lumpkin County in 1828, which led to the Georgia Gold Rush in 1829, it was discovered on 239 acre owned by Robert Obar. After at least two intermediary sales, the land was purchased by Senator John C. Calhoun of South Carolina, who was also the 7th Vice President of the United States. Calhoun started a mining company to mine the land and later allowed his son-in-law Thomas Green Clemson, the founder of Clemson University, to manage it. The ore deposit was a very rich deposit and, according to an 1856 letter from Clemson to his brother-in-law, was still producing significant quantities of gold nearly 30 years after its initial discovery on the land. This mine - along with the Consolidated Mine and the Loud Mine - were some of the most productive mines in the Georgia Gold Belt.
Document 3: Crisson Mine: Crisson Mine was a gold mine in Lumpkin County, Georgia, USA, located just east of Dahlonega. Like many mines in the area, the property probably started as a placer mine during the Georgia Gold Rush. Once the placer deposits had been exhausted, an open pit gold mine was established in 1847 and commercial operations continued until the early 1980s. A small stamp mill was also established here. Much of the gold used for the gold leaf dome of the Georgia State Capitol was mined at this mine, which was among the most productive mine in the Georgia Gold Belt. The mine is located just north of the site of the Consolidated Mine, which is itself north of and the Calhoun Mine.
Document 4: California Gold Rush: The California Gold Rush (1848–1855) began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The news of gold brought some 300,000 people to California from the rest of the United States and abroad. The sudden influx of immigration and gold into the money supply reinvigorated the American economy, and California became one of the few American states to go directly to statehood without first being a territory, in the Compromise of 1850. The Gold Rush initiated the California Genocide, with 100,000 Native Californians dying between 1848 and 1868. By the time it ended, California had gone from a thinly populated ex-Mexican territory to the home state of the first nominee for the Republican Party.
Document 5: North Georgia mountains: The Georgia Mountains Region or North Georgia mountains or Northeast Georgia is an area that starts in the northeast corner of Georgia, United States, and spreads in a westerly direction. The mountains in this region are in the Blue Ridge mountain chain that ends in Georgia. At over 1 billion years of age, the Blue Ridge mountains are among the oldest mountains in the United States and sometimes mistaken to be the oldest mountains in the world (they are only about one third of the age of South Africa's 3.6 billion year old Barberton greenstone belt.). The mountains in this region are also a part of the vast system of North American mountains known as the Appalachian Mountains that spans most of the United States longitudally along the eastern areas of the nation and terminates in Alabama.
Document 6: Blue Ridge Parkway: The Blue Ridge Parkway is a National Parkway and All-American Road in the United States, noted for its scenic beauty. The parkway, which is America's longest linear park, runs for 469 mi through 29 Virginia and North Carolina counties, linking Shenandoah National Park to Great Smoky Mountains National Park. It runs mostly along the spine of the Blue Ridge, a major mountain chain that is part of the Appalachian Mountains. Its southern terminus is at U.S. 441 on the boundary between Great Smoky Mountains National Park and the Cherokee Indian Reservation in North Carolina, from which it travels north to Shenandoah National Park in Virginia. The roadway continues through Shenandoah as Skyline Drive, a similar scenic road which is managed by a different National Park Service unit.
Document 7: Appalachian Mountains: The Appalachian Mountains ( , French: "les Appalaches" ), often called the Appalachians, are a system of mountains in eastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period. It once reached elevations similar to those of the Alps and the Rocky Mountains before naturally occurring erosion. The Appalachian chain is a barrier to east-west travel, as it forms a series of alternating ridgelines and valleys oriented in opposition to most roads running east or west.
Document 8: Georgia Gold Rush: The Georgia Gold Rush was the second significant gold rush in the United States and the first in Georgia, and overshadowed the previous rush in North Carolina. It started in 1829 in present-day Lumpkin County near the county seat, Dahlonega, and soon spread through the North Georgia mountains, following the Georgia Gold Belt. By the early 1840s, gold became difficult to find. Many Georgia miners moved west when gold was found in the Sierra Nevada in 1848, starting the California Gold Rush.
Document 9: Piedmont Mountains: The Piedmont Mountains are outlying mountains, sometimes called “low mountains”, that typically occur in the western Piedmont near the Blue Ridge. Most of the features within the Piedmont physiographic region of North America lie either on the eastern border where the plateau plunges onto the Coastal Plain at the Fall Line, in the broad valleys of the river systems, or on the western border where Piedmont Mountains likely occur. Occasionally, due to diverse rock formations, folds and outcroppings, these mountains can rise at various locations across the Piedmont like the Uwharrie Mountain Range in North Carolina or the Pine Mountain Range in Georgia. Most of these mountains, or hills, are what is left of ancient eroded mountains. Some, like Stone Mountain in Georgia, are solitary rock domes called Monadnocks which become further exposed with erosion. The Piedmont is part of the greater Appalachian Mountain Range and is also referred to as the Appalachian Plateau. The French definition of piedmont in itself translates as foothill; however, a Piedmont Mountain may be that of greater significance or prominent elevation.
Document 10: Brasstown Bald: Brasstown Bald is the highest point in the U.S. state of Georgia. Located in northeast Georgia, the mountain is known to the native Cherokee people as Enotah. The name in English is derived from a mistaken translation of the term for a former Cherokee village nearby, located along the upper Brasstown Creek (named in English from the same error) feeding the Hiawassee River.
Document 11: Allatoona, Georgia: Allatoona was a town located in extreme southeastern Bartow County, Georgia. The population is estimated to have been approximately 1,000. Built along Allatoona Creek, it was a gold mining area later in the first U.S. gold rush, which took place in Georgia and North Carolina. Reaching its height in the 1840s, the Georgia Gold Rush continued into the 1850s even while the second gold rush was occurring in California. (Gold was also mined in nearby Woodstock.)
Document 12: Franklin-Creighton Mine: The Franklin-Creighton Mine was a Georgia Gold Rush gold mine located off what is now Yellow Creek Road in the town of Ball Ground in Cherokee County, Georgia. The mine, located along the Etowah River, was initially known as the Franklin Mine because it was started by a widow, Mrs. Mary G. Franklin, who obtained a 40 acre lot in the Gold Lottery of 1832. Around 1883, the mine became known as the Creighton Mine or the Franklin-Creighton Mine. This mine was one of the most productive and continued to operate many years after other area mines had ceased operations. Some estimate that it was yielding $1000 per day in 1893 and others place its total production after 1880 at as much as $1,000,000. The mine was shut down in 1913 as a result of a collapsed shaft which caused the mine to flood.
Document 13: Great Smoky Mountains: The Great Smoky Mountains are a mountain range rising along the Tennessee–North Carolina border in the southeastern United States. They are a subrange of the Appalachian Mountains, and form part of the Blue Ridge Physiographic Province. The range is sometimes called the Smoky Mountains and the name is commonly shortened to the Smokies. The Great Smokies are best known as the home of the Great Smoky Mountains National Park, which protects most of the range. The park was established in 1934, and, with over 9 million visits per year, it is the most-visited national park in the United States.
Document 14: Blue Ridge Mountains: The Blue Ridge Mountains are a physiographic province of the larger Appalachian Mountains range. This province consists of northern and southern physiographic regions, which divide near the Roanoke River gap. The mountain range is located in the eastern United States, starting at its southernmost portion in Georgia, then ending northward in Pennsylvania. To the west of the Blue Ridge, between it and the bulk of the Appalachians, lies the Great Appalachian Valley, bordered on the west by the Ridge and Valley province of the Appalachian range.
Document 15: Northern Appalachians Seismic Zone: The Northern Appalachians Seismic Zone is an active seismic zone in the Appalachian Mountains of eastern North America, extending from New Brunswick southwards into New England and Boston. Both the seismic zone and the resultant Appalachian Mountains were created by the collision of two tectonic plates about 440–480 million years ago during the middle Ordovician Period.
ground_truth: over 1 billion years