Earlier this month, the group said it had uncovered a new gold-and-silver-bearing vein system at the property with the first two holes.
READ - Prospero Silver uncovers new gold and silver vein system at Pachuca Southeast project, Mexico
A third tested the east-west striking Aguayutla structure to the north of the first two holes and cut multiple zones of anomalous silver values, Prospero said.
Highlights included 121.3 g/t (grams per ton) silver and 0.37 g/t gold over 1.5m from 407.4m downhole.
This intercept included a high-grade sample with abundant argentite which assayed 870ppm (parts per million) silver over 20cm.
"The limited program we've just finished demonstrates that the Pachua SE property hosts a number of blind epithermal veins with silver and gold mineralization; exactly what we'd hoped to see at the property," said Tawn Albinson, the president of Prospero.
"The discovery validates the science-based strategy we've applied to our exploration for blind epithermal targets; a strategy which we've implemented in the drilling and generative work with Fortuna.
"The next step at Pachuca will be additional drilling program to extend mineralization in the veins."
Pachuca Southeast is the third of three early-stage "proof of concept" projects financed by Fortuna Silver Mines and involved the drilling of three holes with a combined depth of 1,800m
The 7,256 hectare concession lies 24km south eastof the city of Pachuca, Hidalgo and infrastructure is excellent, the company says.
The site lies on strike from the Pachuca-Real del Monte epithermal vein camp, one of the world's largest epithermal precious metal deposits and the local geology is typical of a high-level epithermal environment.
Shares in Toronto were unchanged at ten Canadian cents.