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Long-term debt - Borrowings redemption prices (Details)	12 Months Ended
	Dec. 31, 2021
Senior unsecured notes - due July 15, 2027
Long Term Debt
Borrowings redemption price percentage	100.00%
2021 | Senior unsecured notes - due May 15, 2025
Long Term Debt
Borrowings redemption price percentage	103.19%
2022 | Senior unsecured notes - due May 15, 2025
Long Term Debt
Borrowings redemption price percentage	101.59%
2023 | Senior unsecured notes - due May 15, 2025
Long Term Debt
Borrowings redemption price percentage	100.00%
2023 | Senior unsecured notes - due July 15, 2027
Long Term Debt
Borrowings redemption price percentage	103.75%
2024 | Senior unsecured notes - due July 15, 2027
Long Term Debt
Borrowings redemption price percentage	101.88%
2025 and thereafter | Senior unsecured notes - due July 15, 2027
Long Term Debt
Borrowings redemption price percentage	100.00%

X

- Definition

The percentage rate of the aggregate principle amount that determines the redemption price of borrowings.

+ References

No definition available.

+ Details

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Namespace Prefix:	ngd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Long Term Debt.

+ References

No definition available.

+ 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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- Details

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