Berg General Partner S-4 Registration of securities issued in business combination transactions

QuickLinks -- Click here to rapidly navigate through this document

Exhibit 12.1

THOMPSON CREEK METALS COMPANY INC
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
(Amounts in millions, except ratios)

			Three months ended March 31,		Years Ended December 31,
			2011		2010		2009			2008		2007		2006
Earnings:
	Income (loss) before income and mining taxes		$	140.9	$	133.9	$	(54.0	)	$	297.4	$	201.3	$	(28.7	)
	Adjustments:
		Fixed charges added to earnings		0.9		1.0		1.3			15.2		42.2		9.4
			$	141.8	$	134.9	$	(52.7	)	$	312.6	$	243.5	$	19.3
Fixed Charges:
	Interest expense		$	0.9	$	0.9	$	1.2		$	15.1	$	42.1	$	9.4
	Portion of rent expense representative of interest			—		0.1		0.1			0.1		0.1		—
	Fixed charges added to earnings			0.9		1.0		1.3			15.2		42.2		9.4
Ratio of earnings to fixed charges(1)				157.6x		134.9x		N/A			20.6x		5.8x		N/A

(1)

N/A—represents a coverage ratio of less than 1.

QuickLinks

Exhibit 12.1

THOMPSON CREEK METALS COMPANY INC COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (Amounts in millions, except ratios)