The assays come from infill holes at zone 23 and a highlight hole returned the following intercepts.
- 1.81 grams per tonne (g/t) gold and 167.55 g/t silver over 17.9 metres (m) from 8.5 m, including 4.46 g/t gold and 981.48 g/t silver over 2.7 m.
Another hole showed 4.62 g/t gold over 0.8 m from 40.2 m.
"We are extremely pleased with a flow of excellent drill intercepts, confirming high-grade gold shoots and adding silver as byproduct at zone 23," said Dr Alexander Yakubchuk, the director of exploration at Orsu.
"Very high-grade silver intercepts demonstrate that some parts of the system are enriched in this important byproduct metal, which will be further assayed and explored."
Orsu executive chairman Dr. Sergey V. Kurzin added: "It is the first time that we hit some truly high silver grades at Sergeevskoe.
"We have been systematically assaying but largely ignoring the potential economic value of silver until now and concentrated on gold.
"But one can't ignore 5.5 ounces of silver, a rough equivalent of two grams of gold, crossed over almost 18 metres.
"We need to understand this silver occurrence, conceptualize it and test our emerging understanding of silver at Sergeevskoe while doing the next stage of exploration.
"I also note that we have already completed some infill drilling which means that even in our maiden National Instrument 43-101 resource to be prepared later in 2018 we expect to have some resources in measured and indicated categories, not just inferred."