The Riotinto mining strike of 1920 was a general strike that took place in the Riotinto-Nerva mining basin (Huelva) during 1920. The conflict went through several phases of varying intensity and lasted nine months, during which about 11,000 workers took part in the strike movement. The strike, which was extraordinarily tough and had an important media echo in the rest of the country, ultimately failed in its objectives.