The two largest mines were the Mammoth and Golinsky copper mines. In 1884 Charley Golinsky opened a store with a post office and built a hotel and a family residence. In 1883 a railroad camp with more than 1,000 Chinese laborers helped build the California and Oregon Railroad. By 1905 Charles Butters owned 6,000 acres and built roads, churches, schools, and an opera house. The famous Diamond Bar Saloon held offices of the Justice of the Peace in the basement. Soon the copper smelter filled the town and surrounding hills with bluish smoke that killed foliage and destroyed farms up to 15 miles away. A lawsuit closed the mines around 1925. After World War I and the closing of the mines, most people left the town. In 1935 the federal government began construction of the Shasta Dam, and today Kennett is submerged under 400 feet of water.