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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Summary of intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021 | ​ | December 31, 2020 |
​ | ​ | ​ | ​ |  | Accumulated |  | Intangibles, |  | ​ | ​ |  | Accumulated |  | Intangibles, |
​ |  | Original Cost |  | Amortization |  | Net |  | Original Cost |  | Amortization |  | Net |
​ | ​ | (in thousands) | ​
Customer contracts and other | ​ |  | 10,623 | ​ |  | (9,504) | ​ |  | 1,119 | ​ |  | 10,623 | ​ |  | (5,744) | ​ |  | 4,879 | ​
Mining permits | ​ |  | 1,500 | ​ |  | (418) | ​ |  | 1,082 | ​ |  | 1,500 | ​ |  | (373) | ​ |  | 1,127 | ​
Total | ​ | $ | 12,123 | ​ | $ | (9,922) | ​ | $ | 2,201 | ​ | $ | 12,123 | ​ | $ | (6,117) | ​ | $ | 6,006 | ​
Schedule of estimated amortization expense attributable to intangible assets | ​
​ | ​ | ​ | ​ | ​
Year Ended December 31, | ​ | ​ | (in thousands) |
2022 | ​ | $ | 1,164 | ​
2023 | ​ |  | 45 | ​
2024 | ​ |  | 45 | ​
2025 | ​ |  | 45 | ​
2026 | ​ |  | 45 | ​
Thereafter | ​ |  | 857 | ​
Summary of advance royalties | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |
​ | ​ | 2021 |  | 2020 | ​
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Advance royalties, affiliates (see Note 21 – Related-Party Transactions) | ​ | $ | 55,613 | ​ | $ | 48,389 | ​
Advance royalties, third-parties | ​ |  | 12,869 | ​ |  | 12,570 | ​
Total advance royalties | ​ | $ | 68,482 | ​ | $ | 60,959 | ​

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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