REVENUE (Tables)

6 Months Ended

Jun. 30, 2019

Revenue [abstract]

Schedule of Revenue from Contracts with Customers

	Six months ended June 30,
	2018		2019		2019
	CNY		CNY		US$
	(Unaudited)		(Unaudited)		(Unaudited)
Revenue from contracts with customers
Sale of copper ores		—		1,403		204

Schedule of Disaggregated Revenue Information

Disaggregated revenue information

	Six months ended June 30,
	2018		2019		2019
	CNY		CNY		US$
	(Unaudited)		(Unaudited)		(Unaudited)
Type of goods
Sale of copper ores		—		1,403		204
Geographic market
Mainland China		—		1,403		204
Timing of revenue recognition
Goods transferred at a point in time		—		1,403		204