Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

Summary of disaggregation of revenue (Details) ¥ in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2026 CNY (¥)	Jun. 30, 2025 CNY (¥)
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,640	¥ 11,131	¥ 175,588
Third Parties [Member]
Disaggregation of Revenue [Line Items]
Total revenue	41	279	175,588
Third Parties [Member] \| Mining Products [Member]
Disaggregation of Revenue [Line Items]
Total revenue		246	175,444
Third Parties [Member] \| Other Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue		33	144
Related Party [Member]
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,599	10,852
Related Party [Member] \| Work In Progress [Member]
Disaggregation of Revenue [Line Items]
Total revenue		¥ 10,852