REVENUE

6 Months Ended

Jun. 30, 2019

Revenue [abstract]

REVENUE

2. REVENUE

	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

(i)    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

(ii)   Performance obligations

Information about the Group’s performance obligations is summarized below:

Sale of copper ores

The performance obligation is satisfied upon delivery of the copper ores and payment is generally due within 30 days from delivery.