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From 1990 to 1999, what has gradually become one of the leading industries in Youyu County?

From 1990 to 1999, the coal industry has gradually become one of the leading industries in Youyu County. Youyu County mainly contains coal, sillimanite and silica, of which the coal area is 1.65 square kilometers, with a reserve of 3.4 billion tons. Youyu County, belonging to Shuozhou City, Shanxi Province, is located at the northwest end of Shanxi Province, with a total area of 1969 square kilometers.