Bitcoin mining makes up the large majority of Riot's cryptocurrency mining ... Balance sheet was strengthened with a Q2/19 cash and cryptocurrency ...
source https://www.google.com/url?rct=j&sa=t&url=https://www.prnewswire.com/news-releases/riot-blockchain-announces-q219-financial-results-300899125.html&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNEGLE_9u8VDCgfFAZO7lezyLEbf7g
