| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | 10-K | 10-K | S-1 |
| OPERATING REVENUES: | | | |
| Operating revenues | 30.9 | 4.1 | 9,045.7 |
| Operating revenues growth | 650.7% | -100.0% | |
| OPERATING EXPENSES: | | | |
| Fuel | 13.2 | 0.4 | |
| Operations and maintenance | 15.5 | 3.3 | |
| General and administrative | 15.0 | 2.3 | |
| Depreciation and amortization | 7.6 | 0.6 | |
| Loss on disposal of fixed assets | 0.1 | 0.0 | |
| Realized gain on sale of digital currencies | 0.1 | 0.0 | |
| Realized loss on sale of miner assets | 0.1 | 0.0 | |
| Impairments on digital currencies | 1.9 | | |
| Impairments on equipment deposits | 1.9 | | |
| Total operating expenses | 106.4 | 13.1 | |
| NET OPERATING LOSS | -22.2 | -2.4 | -1,831.6 |
| Operating margin | -71.8% | -58.4% | -20.2% |
| |
| OTHER INCOME (EXPENSE): | | | |
| Interest expense | -4.6 | -0.2 | |
| Loss on debt extinguishment | 0.6 | 0.0 | |
| Changes in fair value of warrant liabilities | -1.1 | | |
| Changes in fair value of forward sale derivative | -1.3 | | |
| Other | 0.0 | 0.0 | |
| Total other income (expense) | -5.1 | 2.3 | 173.0 |
| NET LOSS | -27.3 | -0.1 | |
| NET LOSS attributable to noncontrolling interest | -15.8 | | |
| Net loss attributable to Stronghold Digital Mining, Inc. | | -0.1 | -1,658.7 |
| |
| NET LOSS attributable to Class A common shareholders: | | | |
| Basic (in USD per share) | ($2.03) | | |
| Diluted (in USD per share) | ($2.03) | | |
| |
| Weighted average number of Class A common shares outstanding: | | | |
| Basic (in shares) | 5.5 | | |
| Diluted (in shares) | 5.5 | | |