Accrued expenses and other liabilities consisted of the following: | | | | | | | | | | | | | September 30, 2020 | | December 31, 2019 | Accrued make-whole for Mercury Clean Up LLC (Note 22) | $ | — | | | $ | 452,740 | | Accrued interest expense | — | | | 264,268 | | | | | | | | | | Accrued Northern Comstock LLC payments (Note 20) | 67,708 | | | 180,833 | | Accrued payroll costs | 121,476 | | | 165,543 | | Accrued make-whole for Pelen LLC (Note 21) | — | | | 222,602 | | | | | | Accrued Board of Directors fees | 75,000 | | | 120,000 | | Accrued vendor liabilities | 126,041 | | | 309,515 | | Other accrued expenses | 59,646 | | | 139,930 | | Total accrued expenses and other liabilities | $ | 449,871 | | | $ | 1,855,431 | |
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