Planning is underway to drill two to four holes, most likely in the first quarter of 2018, it said.
Prospero is testing the site as part of its continuing 6,950 metre (m) reconnaissance drill campaign financed by strategic partner Fortuna Silver Mines Inc.
Significantly, all of the proposed holes are on previously disturbed land, limiting the environmental impact, and the company does not require a separate environmental permit.
The property, in the Sierra Madre Occidental, has an epithermal vein system exposed over a 2.5km by 50-100m (meter) area, suggesting the potential to host a gold-silver deposit.
Prospero has previously collected 144 channel and chip samples from the epithermal veins, with a best result to date of 1.94 g/t (grams per tonne) of gold.
Sampling has also defined strongly anomalous gold, silver, barium and zinc.
Shares nudged up 3.03% to C$0.17 each.