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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Plant and Equipment (Details)	12 Months Ended
	Dec. 31, 2021
Vehicles | Minimum
Property, Plant and Equipment [Line Items]
Estimated lives	5 years
Vehicles | Maximum
Property, Plant and Equipment [Line Items]
Estimated lives	7 years
Mining equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated lives	3 years
Mining equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated lives	21 years
Mobile equipment components | Minimum
Property, Plant and Equipment [Line Items]
Estimated lives	2 years
Mobile equipment components | Maximum
Property, Plant and Equipment [Line Items]
Estimated lives	7 years
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated lives	5 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated lives	21 years
Mine plant equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated lives	3 years
Mine plant equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated lives	21 years
Underground infrastructure | Minimum
Property, Plant and Equipment [Line Items]
Estimated lives	5 years
Underground infrastructure | Maximum
Property, Plant and Equipment [Line Items]
Estimated lives	21 years
ROU assets - plant and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated lives	10 years
ROU assets - plant and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated lives	21 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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- Details

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X

- Details

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- Details

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- Details

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X

- Details

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X

- Details

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- Details

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