INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2022

Notes and other explanatory information [abstract]

INTANGIBLE ASSETS

12. INTANGIBLE ASSETS

	Patent			Concession right			Software			Total
		CNY			CNY			CNY			CNY
Cost
As of January 1, 2021		22,878			—			274			23,152
Transfer in		—			20,430			—			20,430
As of December 31, 2021		22,878			20,430			274			43,582
Accumulated amortization and impairment
As of January 1, 2021		(22,388	)		—			(121	)		(22,509	)
Amortization charge		(105	)		(730	)		(49	)		(884	)
As of December 31, 2021		(22,493	)		(730	)		(170	)		(23,393	)
Net carrying amount
As of January 1, 2021		490			—			153			643
As of December 31, 2021		385			19,700			104			20,189
Cost
As of January 1, 2022		22,878			20,430			274			43,582
Additions		—			—			5			5
As of December 31, 2022		22,878			20,430			279			43,587
Accumulated amortization and impairment
As of January 1, 2022		(22,493	)		(730	)		(170	)		(23,393	)
Amortization charge		(36	)		(730	)		(47	)		(813	)
As of December 31, 2022		(22,529	)		(1,460	)		(217	)		(24,206	)
Net carrying amount
As of December 31, 2022		349			18,970			62			19,381
As of December 31, 2022 (US$)		51			2,750			9			2,810

As of December 31, 2021 and 2022, the Group’s concession rights and assets associated with the environmental water projects (comprising intangible asset, contract assets and trade receivables) with aggregate gross carrying amounts of CNY129,437 and CNY139,060 (US$20,160), respectively, were pledged to secure bank loans from Bank of Communications with outstanding balances of CNY77,000 and CNY74,000 (US$10,728), respectively. Please refer to Note 21 for further details.

There was no impairment loss on intangible assets for the years ended December 31, 2020, 2021 and 2022.