The work completes the third project in a 6,900m program to test three of Prospero's projects under the terms of the strategic investment from Fortuna Silver Mines last year.
Prospero and Fortuna are planning a three-hole to four-hole program to test two targets with deep, angled holes.
The 7,256-hectare Pachuca SE claim is 24km southeast of the city of Pachuca, Hidalgo.
Infrastructure is excellent, with power available and easy road access from the Pachuca-Tulancingo freeway which crosses the middle of the property.
Pachuca SE is 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 typical of anomalous gold (Au), silver (Ag) and zinc (Zn) geochemistry.
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The first hole will target an actively mined clay pit, which consists of a structurally controlled illite alteration zone that is mined to produce construction brick.