Glencore pre-payment facility	12 Months Ended
Dec. 31, 2021
Disclosure of Pre-payment facility [abstract]
Glencore pre-payment facility	14.Glencore pre-payment facility On January 29, 2017, the Company entered into a pre-payment facility for $15.0 million with Metagri S.A. de C.V., a subsidiary of Glencore PLC (“Glencore”), to fund a portion of the development costs for the San Rafael project within the Cosalá district of Sinaloa, Mexico (the “Pre-Payment Facility”). The Pre-Payment Facility was drawn in full on March 30, 2017, an initial term of four years at an interest of U.S. LIBOR rate plus 5% per annum, and is secured by a promissory note in the amount of up to $15.0 million issued by the Company, a corporate guarantee in favour of Glencore, and limited asset level security on the San Rafael project. The Company has also entered into four-year offtake agreements with Glencore for the zinc and lead concentrates produced from the San Rafael Mine where Glencore will pay for the concentrates at the prevailing market prices for silver, zinc and lead, less customary treatment, refining and penalty charges. Repayment of principal on the Pre-Payment Facility began in January 2018 as an additional tonnage charge on shipments of concentrate where $3.9 million, $5.5 million, and $2.7 million were paid during the years ended December 31, 2018, 2019, and 2020, respectively. The Company paid $1.4 million during the year ended December 31, 2021.

Glencore pre-payment facility

12 Months Ended

Dec. 31, 2021

Disclosure of Pre-payment facility [abstract]

14.Glencore pre-payment facility

On January 29, 2017, the Company entered into a pre-payment facility for $15.0 million with Metagri S.A. de C.V., a subsidiary of Glencore PLC (“Glencore”), to fund a portion of the development costs for the San Rafael project within the Cosalá district of Sinaloa, Mexico (the “Pre-Payment Facility”). The Pre-Payment Facility was drawn in full on March 30, 2017, an initial term of four years at an interest of U.S. LIBOR rate plus 5% per annum, and is secured by a promissory note in the amount of up to $15.0 million issued by the Company, a corporate guarantee in favour of Glencore, and limited asset level security on the San Rafael project. The Company has also entered into four-year offtake agreements with Glencore for the zinc and lead concentrates produced from the San Rafael Mine where Glencore will pay for the concentrates at the prevailing market prices for silver, zinc and lead, less customary treatment, refining and penalty charges. Repayment of principal on the Pre-Payment Facility began in January 2018 as an additional tonnage charge on shipments of concentrate where $3.9 million, $5.5 million, and $2.7 million were paid during the years ended December 31, 2018, 2019, and 2020, respectively. The Company paid $1.4 million during the year ended December 31, 2021.