Indicated carats increased by about 210,000 carats to 280,000 carats.
Lucapa said total JORC classified inferred resource now sits at 39.4 million tonnes, containing nearly 960,000 carats at a diamond grade of 2.44 cpht and an average un-escalated modelled diamond value of $601 per carat.
Managing Director Stephen Wetherall said the updated figures “strongly” supported an expansion at Mothae, currently under consideration.
“The updated Mothae resource is the results of significant work undertaken to increase the resource and classification at Mothae following almost 16 months of mining and treatment through the new commercial plant,” Wetherall said.
Expansion in the cards
The expansion project could see diamond production at the mine increase by roughly 60%. Last year, Mothae produced more than 30,000 carats, including three diamonds of more than 100 carats each.
The company kicked off commercial production at the mine in January last year, with the opening of a new 1.1 million tonne-per-year plant that is progressively ramping up to its nameplate capacity.
Lucapa has a 70% stake in the operation, which it acquired in early 2017. The government of Lesotho owns the remaining 30%.
The mine is located only 5km from Gem Diamonds’ (LON:GEMD) Letšeng, the world’s highest dollar-per-carat kimberlite diamond mine.
The company also has a 40% stake in the prolific Lulo mine in Angola, where operations resumed partially in May.
Lucapa’s stock climbed 18.5% in early trading to 8 Australian cents. It closed 6.15% higher at 7 Australian cents, leaving the company with a A$44.5 million market capitalization.
