Boliden AB is a Swedish multinational metals, mining, and smelting company headquartered in Stockholm. The company produces zinc, copper, lead, nickel, silver, and gold, with operations in Sweden, Finland, Norway, Portugal, and Ireland. Founded in the 1920s and named after the Boliden mine, a now-defunct gold mine 30 km northwest of the Swedish town of Skellefteå, Boliden AB began as a gold mining company. Over the following decades, it expanded into copper, silver and nickel mining, as well as smelting. In the 1970s, following a period of high metals prices, the company diversified aggressively, purchasing appliance manufacturers, wholesalers and trading companies. In 1985, it was acquired by Trelleborg, a polymer manufacturer, which refocused it back on mining while also expanding overseas. In 1998, Trelleborg moved Boliden's headquarters to Toronto, Canada and sold Boliden again on the stock market. However, Boliden's share price collapsed over the next four years, due to a combination of low metal prices and a dam failure at one of its mines in Spain that led to an environmental disaster. Wikipedia