Summary

Mine Type	Underground
Status	Active
Commodities	Copper Zinc Silver Gold
Production Start	...
Mine Life	...
Snapshot	The Cerro de Maimón North (CDMN) deposit was mined as an open pit from 2008 until 2020, after which the pit was repurposed as a tailings facility. Underground mining at CDMN began in 2020, and production at the Cerro de Maimón South (CDMS) deposit is underway. The plant processes sulphide ore for copper with gold-silver by-products; oxide ore was mined out by 2015. Nearby prospects—Loma Pesada, Loma Barbuito, Cerro Kiosko, and Doña Amanda—highlight the area’s broader potential. Doña Amanda is notable for its size, though lower in grade. The company is pursuing near-mine reserve expansion and acquiring new exploration targets across the Dominican Republic, aiming to make Cerro de Maimón a regional mining hub. Perilya Ltd. has not regularly reported production data since its 2013 delisting from the ASX. As a privately held company (owned by China’s Zhongjin Lingnan Nonfemet), Perilya’s detailed financial results are not disclosed in the same way as a public company.

Deposit type

• VMS

Summary:

The Cerro de Maimón deposit is a typical volcanic-hosted exhalative massive sulphide body (VMS type). It contains sulphide ores with recoverable copper, gold and silver, overlain by a gold and silver rich oxide cap.

The deposit is hosted by the Maimón Formation, part of the Early Cretaceous Caribbean volcanic island arc, that trends northwest-southeast across the central part of Hispaniola. The Cerro de Maimón deposit is found within inter-bedded chlorite and sericite schists with thin beds of graphitic and siliceous exhalite. The Cerro de Maimón orebody is the largest known volcanic massive sulphide occurrence in the Maimón Formation. The original felsic volcanoclastic rocks (lapilli rhyolites and lapilli tuffs) have been metamorphosed to greenschist facies through seawater hydrothermal alteration and occur in both the hanging and the footwall to the orebody. In the hanging wall, felsic rocks are intercalated with mafic chlorite schists. Weathering of the massive sulphide has resulted in the oxide cap enriched in gold and silver.

The deposit outcrops at surface, plunges southeast at 25° and dips 30° southwest. The dip flattens to 20° down plunge. It is 200 meters wide, 1,000 meters long, up to 40 meters thick near surface and narrows to 5 meters down plunge. The average thickness is approximately 12 meters.

Mineralization occurs in three types: a near-surface gold/silver rich oxide cap, a supergene enriched sulphide zone, where the unaltered massive sulphide has been preferentially enriched in copper, and the unaltered massive sulphide mineralisation deeper in the deposit, below the effect of weathering and where the copper to zinc ratio approaches 1:1. The oxide cap comprises goethite enriched in gold and silver and averages 30 meters in thickness. Mineralisation in the sulphide material consists of massive to semi-massive, rounded to angular pyrite with interstitial chalcopyrite and sphalerite. Bornite, tennantite, tetrahedrite and galena occur as trace minerals. Gangue minerals include quartz, sericite, chlorite, minor calcite and barite. Secondary copper minerals, including chalcocite and covellite, partially replace the primary sulphide minerals. Supergene enrichment has locally raised the copper content to as much as 10%. Copper grades in the un-weathered sulphide mineralisation are generally between 2% and 3%.

Mining Methods

- subscription is required.

Comminution

Crushers and Mills

- subscription is required.

Processing

- subscription is required.

Commodity Production

Commodity	Product	Units	2022	2021	2020	2018	2017	2016	2015
Copper	Metal in concentrate	t	....	....	....	6,530	8,549	8,314	6,884
Zinc	Metal in concentrate	t	....	....	....	3,086	3,920	3,636	4,655
Silver	Metal in conc./ doré	oz	....	....	....	178,877	270,852	298,697	336,971
Gold	Metal in conc./ doré	oz	....	....	....	4,716	6,868	7,397	8,757

Operational metrics

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Jul 29, 2025
.......................	.......................		Jul 29, 2025
.......................	.......................		Jul 29, 2025

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