Historically tin mining was important in the Cornish economy, becoming increasingly significant during the High Middle Ages and expanding greatly during the 19th century when rich copper mines were also in production. In the mid-nineteenth century, however, the tin and copper mines entered a period of decline. Subsequently china clay extraction became more important and metal mining had virtually ended by the 1990s. Traditionally fishing (particularly of pilchards), and agriculture (particularly of dairy products and vegetables), were the other important sectors of the economy. The railways led to the growth of tourism during the 20th century, however, Cornwall's economy struggled after the decline of the mining and fishing industries. The area is noted for its wild moorland landscapes, its long and varied coastline, its many place names derived from the Cornish language, and its very mild climate.