| Schedule of Accrued Expenses and Other Current Liabilities |
| | | | | | | | | As of | | As of | | | December 31, | | December 31, | | | 2021 | | 2020 | | | | (in thousands) | Accrued royalty payments | | | 1,743 | | | 1,796 | Dividends payable | | | - | | | 247 | Zinc derivatives | | | 1,844 | | | - | Employee profit sharing obligation | | | 1,888 | | | - | Other payables | | | 1,100 | | | 232 | Total accrued expenses and other current liabilities | | $ | 6,575 | | $ | 2,275 | | | | | | | | Accrued non-current labor obligation | | | 920 | | | - | Deferred stock unit compensation liability | | | 206 | | | - | Other long-term liabilities | | | 826 | | | 13 | Total other non-current liabilities | | $ | 1,952 | | $ | 13 |
|