Lucapa found the precious gem - along with other stones weighing 29.2 carats, 12.37 carats and 11.1 carats – while processing 15,000 cubic metres of alluvial gravels from mining blocks six and eight.
The company said the 133.4 carat diamond was the largest diamond recovered to date at Lulo, eclipsing the 131.4 carat D-colour Type IIa diamond recovered from bulk sampling in 2012.
“While the compound 133.4 carat diamond is not of high quality, the recovery of this large stone and three other specials from mining… underlines the potential for mining block six to be another significant source of large alluvial diamonds,” the company said in a statement.
Lucapa chief executive Stephen Wetherall said he was delighted with the immediate result and recovery of large diamonds from trial mining at the new higher lying area.
“We are certainly excited by what we are seeing at mining block six where our management exploration target is to prove up sufficient gravels to incrementally add up to 12 months of alluvial diamond production,” he said.
“The fact the 133.4 carat stone is a compound diamond which is unlikely to have travelled very far from its primary source and its relative downstream proximity to mining block eight and our high priority-kimberlite targets we believe is very significant.”
Lucapa shares were up 2.5 cents, or 9.62 per cent, to 28 cents at the close.
The West Australian 25.01.2016