Stockholders' Equity - Stock-based compensation expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Stock-based compensation expense
Stock-based compensation expense	$ 953,391	$ 1,009,078	$ 2,493,330	$ 2,373,711
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense
Stock-based compensation expense
Stock-based compensation expense	755,185	780,423	2,032,109	1,650,440
Location, Statement of Income, Balance [Axis]: dc:MineralRightsAndPropertiesExplorationExpense
Stock-based compensation expense
Stock-based compensation expense	198,206	228,655	461,221	723,271
RSUs \| Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense
Stock-based compensation expense
Stock-based compensation expense	515,452	420,401	1,258,931	1,111,761
RSUs \| Location, Statement of Income, Balance [Axis]: dc:MineralRightsAndPropertiesExplorationExpense
Stock-based compensation expense
Stock-based compensation expense	172,898	128,282	432,707	424,676
PSUs \| Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense
Stock-based compensation expense
Stock-based compensation expense	25,985	111,502	30,013	252,945
PSUs \| Location, Statement of Income, Balance [Axis]: dc:MineralRightsAndPropertiesExplorationExpense
Stock-based compensation expense
Stock-based compensation expense		30,387	(47,094)	141,762
Employee Stock Option \| Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense
Stock-based compensation expense
Stock-based compensation expense	213,748	248,520	743,165	285,734
Employee Stock Option \| Location, Statement of Income, Balance [Axis]: dc:MineralRightsAndPropertiesExplorationExpense
Stock-based compensation expense
Stock-based compensation expense	$ 25,308	$ 69,986	$ 75,608	$ 156,833