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Why did gold discoveries in the Black Hills lead to renewed conflict with the Oceti Sakowin?

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A Cheyenne River Sioux dancer in colorful traditional regalia performs during the Grand Entry at a powwow, with an American flag and other participants in the background. — Oceti Sakowin A member of the Cheyenne River Sioux Tribe performing during the Grand Entry at the Cheyenne River Sioux Tribe Fair Rodeo and Powwow, Eagle Butte, South Dakota, September 4, 2016.

The discovery of gold in the Black Hills of South Dakota in the mid-1870s led to renewed conflict because it triggered a massive influx of miners and speculators who disregarded the Second Treaty of Fort Laramie (1868).12

This treaty had explicitly guaranteed the Oceti Sakowin exclusive possession of the region, which the Lakota considered sacred. Despite the treaty, the U.S. government faced intense pressure to annex the land following the confirmation of gold deposits by George Armstrong Custer and other expeditions. When the U.S. failed to negotiate the purchase of mining rights, the administration authorized the use of military force to seize the territory, effectively violating the treaty and precipitating the Black Hills War. This illegal seizure of land was later acknowledged by a 1980 Supreme Court decision, which awarded the Sioux financial compensation for the violation of their sovereign rights.1342