Net Income (Loss) Per Common Share - Reconciliation of Net Loss Per Share (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income (loss) attributable to Comstock Mining Inc.	$ 1,275,986	$ (263,212)	$ (2,077,744)	$ (1,835,065)	$ 1,012,774	$ (3,912,809)
Denominator:
Basic and diluted weighted average shares outstanding (in shares)	28,253,242		16,594,983		27,758,899	16,199,927
Incremental shares (in shares)	11,231		0		5,615	0
Diluted weighted average shares outstanding (in shares)	28,264,472		16,594,983		27,764,514	16,199,927
Net income (loss) per common share:
Basic EPS (in dollars per share)	$ 0.05		$ (0.13)		$ 0.04	$ (0.24)
Diluted EPS (in dollars per share)	$ 0.05		$ (0.13)		$ 0.04	$ (0.24)