It comes after Fortuna Silver Mines last month exercised its right for an option to acquire up to a 70% interest in the project.
READ THE BIG PICTURE: Prospero Silver with potential catalysts ahead after Fortuna Silver Mines exercises option for Pachuca SE
To do so, it must spend US$8 million and complete a preliminary economic assessment, with a minimum spend of $1 million in the first year.
A six hole, 4,200m (meter) program started on January 14 to test a number of potential vein targets.
In the first quarter of 2018, Prospero, with financing provided by Fortuna, completed a 1,800-metre drill program, in three holes, which tested three distinct targets with deep, angled holes.
"Our 2018 program appears to have successfully cut the upper parts of a series of blind epithermal veins hosting silver and gold mineralization," Tawn Albinson, the President of Prospero told investors today.
"This is particularly exciting given how close the project is to the historic Pachuca-Real Del Monte camp."
Albinson said the current Phase two program was designed to follow up on the 2018 hits and to drill test a number of additional altered structures that weren't tested in the first phase.
The 6,669 hectare Pachuca Southeast land package lies 24 km southeast of the city of Pachuca, Hidalgo, along strike from the historic Pachuca-Real del Monte epithermal vein camp - one of the world's largest epithermal precious metal deposits.
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