Overview

Mine Type	Underground
Status	Active
Commodities	Copper Gold Silver Zinc
Production Start	...
Mine Life	...
Snapshot	In the spring of 2023, the Cerro de Maimón mine was under care and maintenance due to a workers' strike and blockade. The Cerro de Maimón North (“CDMN”) deposit on the Cerro de Maimón Exploitation Concession has been in production as an open pit since September 2008. Mining of the CDMN open pit was completed in 2020, with the open pit void to be utilised as a tailings facility. Mining of the CDMN underground mine commenced in 2020 and will provide continuous production as the Cerro de Maimón South (“CDMS”) comes on track. The Dominican Republic Operations underground will be extended from North to South.

Deposit type

• VMS

Summary:

Mineralization in the massive sulphide deposit consists of closely packed, rounded to angular grains of pyrite (generally around 200 microns in diameter) with lesser, interstitial chalcopyrite and sphalerite (generally 5 to 50 microns in diameter). The ore mineral assemblage (in order of decreasing abundance) is pyrite, chalcopyrite, chalcocite, bornite, sphalerite, galena, and tetrahedrite. Base metal sulphides are very fine grained. Bornite, tennantite-tetrahedrite, and galena occur in trace amounts as inclusions within pyrite and filling interstices between grains. Gangue minerals include quartz, sericite, chlorite, rare calcite, and barite.

The massive sulphide deposit has been affected by supergene oxidation and copper enrichment. Chalcocite and covellite partially replace chalcopyrite, sphalerite and bornite. Copper grades of the protore, generally between 2% and 3%, are locally enriched to as much as 10%. These zones of enrichment are irregularly distributed within massive sulphide lenses and are observed above, below and within mainly primary massive sulphide lenses.

Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

Commodity	Product	Units	2021	2020	2018	2017	2016	2015
Copper	Metal in concentrate	t	....	....	6,530	8,549	8,314	6,884
Gold	Metal in conc./ doré	oz	....	....	4,716	6,868	7,397	8,757
Silver	Metal in conc./ doré	oz	....	....	178,877	270,852	298,697	336,971
Zinc	Metal in concentrate	t	....	....	3,086	3,920	3,636	4,655

Operational metrics

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Oct 11, 2023
.......................	.......................		Oct 11, 2023
.......................	.......................		Oct 11, 2023

Employees	Contractors	Total Workforce	Year
......	......	......	2021
......	......	......	2020