The Triangle Zone is located within the Lamaque project in the prolific Val d’Or mining district of Québec. The property is located 2.5 km south of the past producing Lamaque and Sigma Mines, which together produced more than 10 Mozs of gold.
Triangle is an Archean greenstone-hosted orogenic lode gold deposit. Gold is found within quartz-tourmaline-carbonate veins, which are hosted within a series of subparallel sub-vertical shear zones centered around a steeply plunging cylinder-shaped porphyritic diorite. Individual gold bearing vein zones and associated alteration are 4 to 5 metres thick on average and extend 500 to 700 metres horizontally and vertically. To date, seven structures have been identified by drilling from surface to around 1,000 metres vertical depth.
As of Dec. 31, 2017, the Proven and Probable Mineral Reserve at the Triangle deposit was 893 kozs of gold contained in 3.8 Mt at a grade of 7.3 g/t (3.5 g/t cut-off ) and the Measured and Indicated Resource was 1.1 Mozs contained in 3.7 Mt at 8.9 g/t gold. The Inferred Resource totals 1.1 Moz in 4.7 Mt at a grade of 7.42 g/t (2.5 g/t cut-off inclusive of Reserves).
Eldorado achieved commercial production in March 2019. The Sandstorm royalty covers a portion of the Triangle reserves and resources.
Eldorado received a Certificate of Authorization from the Quebec Ministry of Environment allowing for the expansion of underground production from the Triangle Deposit from 1,800 tonnes per day to 2,650 tonnes per day.
Exploration activities at Lamaque including 22,650 metres of diamond drilling targeting the lower Triangle Deposit have focused on expanding mineral resources and converting resources to reserves. Results to date have successfully expanded high-grade mineralization beyond the 2018 resource model.