The following table provides supplemental cash flow information (dollars in thousands): | | | | | | | | | | | | | Nine Months Ended September 30, | | 2021 | | 2020 | Cash interest paid | $ | 2,153 | | | $ | 5,366 | | | | | | Significant non-cash financing and investing activities: | | | | Increase in debt from in-kind interest | 13,696 | | | — | | Plant, equipment, and mine development acquired by note payable | 538 | | | — | | Plant, equipment, and mine development additions included in accounts payable | 424 | | | 3,713 | | Liability based restricted stock units transferred to equity | 754 | | | — | | Exchange of Seller lien notes for HYMC common stock | — | | | 208,713 | | Exchange of Seller lien notes for Subordinated Notes | — | | | 80,000 | | Allocate and write-off Seller's debt issuance costs | — | | | 8,202 | |
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