REVENUE (Tables)

6 Months Ended

Jun. 30, 2021

Revenue [abstract]

Schedule of Revenue from Contracts with Customers

	Six months ended June 30,
	2020		2021		2021
	CNY		CNY		US$
	(Unaudited)		(Unaudited)		(Unaudited)
Revenue from contracts with a customer		6,867		—		—

Schedule of Disaggregated Revenue Information

	Six months ended June 30,
	2020		2021		2021
	CNY		CNY		US$
	(Unaudited)		(Unaudited)		(Unaudited)
Type of goods
Sale of copper ores		6,867		—		—
Geographic market
Mainland China		6,867		—		—
Timing of revenue recognition
Goods transferred at a point in time		6,867		—		—