TOKYO, June 21 (Reuters) - Cryptocurrencies tumbled on Monday as China’s crackdown on bitcoin mining expanded to the province of Sichuan. Bitcoin fell to as low as $32,288 for the first time since June 8, and was last down 7.9% at around $32,781. Smaller rival ether dropped below $2,000 for the first time since May 23, before trading 10% lower at 2019.01. Cryptomining is big business in China, accounting for more than half of global bitcoin production. (Reporting by Kevin Buckland; Editing by Toby Chopra) Our Standards: The Thomson Reuters Trust Principles.