Definition of "Hopi"

A Coal Mine capable of producing 450,000 tons of coal annually started operation in Hopi, Honan.

1960 September, “1957 April-December”, in E. Stuart Kirby, editor, Contemporary China‎, volume III, page 278

Two other major coal-mining centers, each producing coking-grade bituminous coal, have been developed in Honan since the late 1950's. Hopi, in northernmost Honan, arose in 1957 on the site of a small, primitive operation in a deposit of lean coal, low in volatile content. A city was established in that year, and the mining complex was linked by a 12-mile rail spur with Tangyin, on the main Peking-Hankow line.

1972, Theodore Shabad, “The North China Plain”, in China's Changing Map‎, New York: Frederick A. Praeger, page 119

Death certificates were tabulated to map morality from esophageal cancer in the 181 counties and cities of the survey. The counties with the highest incidences were Yangcheng and Hopi with rates, respectively, of 135 and 140 per 100,000. By contrast, in Hunyuan County the rate was under 2 per 100,000.

1975 June 17, Walter Sullivan, “CHINA STUDY LINKS CANCER TO REGION”, in The New York Times‎, archived from the original on 05 October 2023, page 66‎