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Gold Hill, in Grass Valley, California, was the site of one of the first discoveries of quartz gold in California. While quartz gold was also found in other areas of Nevada County, California during the same time, it is this find near Wolf Creek that led to quartz-mining frenzy and subsequent creation of the Gold Country quartz-mining industry. The location is honored as a California Historical Landmark. ==History== George Knight (sometimes known as McKnight) was a California Gold Rush miner. In October 1850, he was on a Grass Valley hillside when he came across an outcropping of white quartz rock laced with yellow. He pounded the rock with a cast iron skillet and hammer, then washed out the gold. Searching for more gold in the same spot, he dug down into the outcropping and found a gold vein. His find was announced by another miner, George Crandall (1825–1908), who ran down to Boston Ravine, a small settlement nearby, with the news. Knight named the location Gold Hill and his claim became the Gold Hill Mine. He and friends constructed a crude stamp mill made out of the local forest's pine tree logs and equipped it with metal boots. The contraption was propelled by Wolf Creek's rushing water. By March 1851, there were 150 buildings in the area, including hotels, saloons, stores, and even the first school.〔(【引用サイトリンク】title=Town History )〕 Before the end of the year, thousands of people had moved to Grass Valley and neighboring Nevada City, California.〔(【引用サイトリンク】title=Mining )〕 While Gold Hill Mine produced $4,000,000 between 1850–1857, it "pinched out" by 1864 and closed. A 1940 geological survey of the Gold Hill Quartz Mine reported the host rock to be Diabase and Granodiorite and the mineral list showed gold, pyrite, and quartz. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gold Hill (Nevada County, California)」の詳細全文を読む スポンサード リンク
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