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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Income Tax Disclosure [Abstract] |  |
Deferred tax liabilities |  |
Deferred tax assets: |  |
Impairment on property, plant and equipment |  | 2,907,548
Impairment on prepaid land lease | 877,244 | 883,884
Exploration costs | 1,919,666 | 1,908,087
Compensation costs of unexercised stock options | 1,614 | 74,883
Miscellaneous | (77,241) |
PRC tax losses | 23,352,679 | 21,643,028
US federal net operating loss | 1,267,960 | 1,045,503
Total deferred tax assets | 27,341,922 | 28,462,933
Valuation allowance | (9,943,998) | (9,872,706)
Net deferred tax asset | $ 17,397,924 | $ 18,590,227

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