Mining, particularly of copper, lead (often associated with quantities of silver), baryte, graphite and slate, was historically a major Lakeland industry, mainly from the 16th to 19th centuries. Coppiced woodland was used extensively to provide charcoal for smelting. Some mining still takes place today; for example, slate mining continues at the Honister Mines, at the top of Honister Pass. Abandoned mine workings can be found on fellsides throughout the district. The locally mined graphite led to the development of the pencil industry, especially around Keswick.