The DRC-focused gold explorer said in the Inferred category, at a cut-off grade of 0.5 grams per tonne (g/t) gold, the resource estimate comprises 35.6 million tonnes containing 1.87 million ounces of gold at an average grade of 1.63 g/t gold.
Thursday afternoon, Kilo Goldmines shares were up 9 percent to 24 cents.
Kilo saw an increase in average gold grade by 18 percent and said that the mineralization remains open on strike and at depth and further infill and step-out drilling is planned.
Kilo's president and chief executive officer Alex van Hoeken said: "Our latest updated mineral resource estimate reaffirms that the Adumbi deposit has significant gold mineralization, with significant potential to grow in size with further systematic exploration.
"Considering that this year's exploration focus is on the adjacent nearby prospects, the new Adumbi mineral resource estimate will contribute to the overall objective of increasing and improving the mineral resources within the Adumbi exploitation permit.
"Management continues to believe that the Adumbi mineral resource as currently defined has significant upside potential and more drilling, which will commence shortly on land immediately adjacent to the Mineral Resource as currently defined, will test this hypothesis."
Thursday's updated mineral resource estimate was based on a more robust geological model, culminating in an increase in average grade and a corresponding increase in gold ounces within higher grade categories. It was based on approximately 10,750 metres of sampling data, including data from 4 underground adits, 49 diamond boreholes and 18 surface trenches.
The deposit remains open at depth and along strike and is thus believed to have significant upside potential, Kilo Goldmines said.
Kilo Goldmines has over 7,000 square km of favourable Archaean Kibalian greenstone in the Kilo-Moto area in north-eastern DRC.