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Sepon is an open-pit copper mine in the Savannakhet Province, southern Laos. The registered name of the operating company is Lane Xang Minerals Limited (LXML), of which MMG owns 90% and the Lao Government owns 10%.

The operation commenced production in 2005.


Sepon produces 99.9% copper cathode using a whole-of-ore leach, solvent extraction and electrowinning (SX-EW) process. The operation's copper cathode is registered as Copper - Grade A quality by the London Metal Exchange (LME). Hence, Sepon copper is eligible for delivery to LME-approved warehouses.

Copper cathodes are transported via road and sea to manufacturers of cable, wire and tube in Asia and Europe.

In 2017 Sepon produced 62,941 tonnes of copper cathode.

MMG expects to produce 70,000 to 80,000 tonnes of copper cathode at Sepon in 2018.


The Sepon gold project yielded its first gold and silver doré in December 2002. In early 2005, an expansion of the original gold processing facility was completed, doubling the capacity of the gold processing plant to 2.5 million tonnes of ore per annum.

During its operations, the Sepon gold operation produced over 1.2 million ounces of gold through open pit mining and conventional treatment of oxide gold ore.

MMG ceased gold operations in December 2013 due to depleting ore reserves and lower margins. The gold plant has been placed on care and maintenance while the Sepon operation focuses on copper production.



The Sepon mine is located in Vilabouly district, Savannakhet province.

It operates 24 hours a day, 7 days a week, 365 days of the year.

Sepon is a closed site and does not provide tours.

Vientiane office

Sepon’s administrative functions are managed out of the Vientiane office.

MMG House, Bourichanh Road, Sisattanak District,
PO Box 4486, Vientiane Capital Lao PDR
T (021) 268 200
F (021) 268 201

The Vientiane office operates from 8am to 5pm Monday to Friday.


Sonepraseuth Niradsay
Superintendent – Communications 

Gus Gomes
Group General Manager - ASEA Operations

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